DX - Find The Needlepdfs.findtheneedle.co.uk/117360-1993.pdfMineral Oil 70 o HFA-ISO46 High Water fluid 70 o HFC-Water-Glycol 70 o HFD-Phosphate Ester 70 + Water 20 o ... BP Energrease

DXMarginally lubricated

Designer´s Handbook

I

QualityAll the products described in this handbook are manufactured under DIN EN ISO 9001, ISO/TS 16949 and ISO 14001approved quality management systems.

II

Formula Symbols and Designations

FormulaSymbol Unit Designation

aB - Bearing size factor

aE - High load factor

aQ - Speed/Load factor

aS - Surface finish factor

aT - Temperature application factor

B mm Nominal bush width

C 1/min Dynamic load frequency

CD mm Installed diametral clearance

CDm mm Diametral clearance machined

CT - Total number of dynamic load cycles

Ci mm ID chamfer length

Co mm OD chamfer length

DH mm Housing Diameter

Di mm Nominal bush/thrust washer ID

Di,a mm Bush ID when assembled in housing

Di,a,m mm Bush ID assembled and machined

DJm mm Shaft for machined bushes

DJ mm Shaft diameter

Do mm Nominal bush/thrust washer OD

dD mm Dowel hole diameter

dL mm Oil hole diameter

dP mm Pitch circle diameter for dowel hole

F N Bearing load

Fi N Insertion force

f - Friction

Ha mm Depth of Housing Recess(e.g. for thrust washers)

Hd mm Diameter of Housing Recess(thrust washers)

L mm Strip length

LH h Bearing service life

LRG h Relubrication interval

N 1/min Rotational speed

Nosz 1/min Oscillating movement frequency

p N/mm² Specific load

plim N/mm² Specific load limit

psta,max N/mm² Maximum static load

pdyn,max N/mm² Maximum dynamic load

Q - Total number of cycles

R - Number of lubrication intervals

Ra µm Surface roughness (DIN 4768, ISO/DIN 4287/1)

s3 mm Bush wall thickness

sS mm Strip thickness

sT mm Thrust washer thickness

T °C Temperature

Tamb °C Ambient temperature

Tmax °C Maximum temperature

Tmin °C Minimum temperature

U m/s Sliding speed

u - speed factor

W mm Strip width

Wu min mm Minimum usable strip width

α1 1/106K Coefficient of linear thermal expansion parallel to surface

α2 1/106K Coefficient of linear thermal expansion normal to surface

σc N/mm² Compressive Yield strength

λ W/mK Thermal conductivity

ϕ ° Angular displacement

η Ns/mm² Dynamic Viscosity

ZT - Total number of osscillating movements

FormulaSymbol Unit Designation

Content

3

ContentQuality . . . . . . . . . . . . . . . . . . . . . IFormula Symbolsand Designations . . . . . . . . . . . . . II

1 Introduction . . . . . . . . . . . 41.1 Characteristics

and Advantages . . . . . . . . . . . . . 4

2 Structure . . . . . . . . . . . . . 42.1 Basic Forms . . . . . . . . . . . . . . . . 5

3 Properties . . . . . . . . . . . . . 63.1 Physical Properties . . . . . . . . . . 63.2 Chemical Properties . . . . . . . . . 6

4 Lubrication . . . . . . . . . . . . 74.1 Choice of Lubricant . . . . . . . . . . 7

Grease . . . . . . . . . . . . . . . . . . . . . 8Oil . . . . . . . . . . . . . . . . . . . . . . . . 8Non lubricating fluids . . . . . . . . . . 8Water . . . . . . . . . . . . . . . . . . . . . . 8Water-Oil Emulsion . . . . . . . . . . . 8Shock-Absorber Oils . . . . . . . . . . 8Petrol . . . . . . . . . . . . . . . . . . . . . . 8Kerosene and Polybutene . . . . . . 8Other Fluids . . . . . . . . . . . . . . . . . 8

4.2 Friction . . . . . . . . . . . . . . . . . . . . 94.3 Lubricated Environments . . . . . 9

Lubrication . . . . . . . . . . . . . . . . . . 94.4 Characteristics of Fluid

Lubricated DX Bearings . . . . . 104.5 Design Guidance for Fluid

Lubricated Applications . . . . . 104.6 Wear Rate and

Relubrication Intervalswith Grease lubrication . . . . . . 12Fretting Wear . . . . . . . . . . . . . . . 12

5 Design Factors . . . . . . . 135.1 Specific Load . . . . . . . . . . . . . . 13

Specific Load Limit . . . . . . . . . . . 135.2 Sliding Speed . . . . . . . . . . . . . . 14

Continuous Rotation . . . . . . . . . 14Oscillating Movement . . . . . . . . 14

5.3 pU Factor . . . . . . . . . . . . . . . . . 155.4 Load . . . . . . . . . . . . . . . . . . . . . 15

Type of Load . . . . . . . . . . . . . . . 155.5 Temperature . . . . . . . . . . . . . . . 175.6 Mating Surface . . . . . . . . . . . . . 175.7 Bearing Size . . . . . . . . . . . . . . . 185.8 Estimation of Bearing Service

Life with Grease Lubrication . 18

5.9 Worked Examples . . . . . . . . . . 20

6 Data Sheet . . . . . . . . . . . 216.1 Data for bearing

design calculations . . . . . . . . . 21

7 Bearing Assembly . . . . . 227.1 Dimensions and Tolerances . . 227.2 Tolerances for

minimum clearance . . . . . . . . . 22Grease lubrication . . . . . . . . . . . 22Fluid Lubrication . . . . . . . . . . . . . 24Allowance forThermal Expansion . . . . . . . . . . 24

7.3 Counterface Design . . . . . . . . . 257.4 Installation . . . . . . . . . . . . . . . . 26

Fitting of Bushes . . . . . . . . . . . . 26Insertion Forces . . . . . . . . . . . . . 26Alignment . . . . . . . . . . . . . . . . . . 27Sealing . . . . . . . . . . . . . . . . . . . . 27Axial Location . . . . . . . . . . . . . . . 27Fitting of Thrust Washers . . . . . . 27Slideways . . . . . . . . . . . . . . . . . . 28

8 Machining . . . . . . . . . . . 298.1 Machining Practice . . . . . . . . . 298.2 Boring . . . . . . . . . . . . . . . . . . . . 298.3 Reaming . . . . . . . . . . . . . . . . . . 308.4 Broaching . . . . . . . . . . . . . . . . . 308.5 Vibrobroaching . . . . . . . . . . . . . 318.6 Modification of components . . 318.7 Drilling Oil Holes . . . . . . . . . . . 318.8 Cutting Strip Material . . . . . . . . 31

9 Electroplating . . . . . . . . 32DX Components . . . . . . . . . . . . . 32Mating Surfaces . . . . . . . . . . . . . 32

10 Standard Products . . . . 3310.1 PM-DX cylindrical bushes . . . . 3310.2 MB-DX cylindrical bushes . . . . 4010.3 DX Thrust Washers . . . . . . . . . 4510.4 DX cylindrical bushes -

Inch sizes . . . . . . . . . . . . . . . . . 4610.5 DX Thrust Washers -

Inch sizes . . . . . . . . . . . . . . . . . 4910.6 DX Strip . . . . . . . . . . . . . . . . . . . 5010.7 DX Strip - Inch sizes . . . . . . . . . 50

4

1 Introduction

1 IntroductionThe purpose of this handbook is to providecomprehensive technical information onthe characteristics of DX® bearings. Theinformation given, permits designers toestablish the correct size of bearingrequired and the expected life and per-formance. GGB Research and Develop-ment services are available to assist withunusual design problems.

Complete information on the range of DXstandard stock products is given togetherwith details of other DX products.GGB is continually refining and extendingits experimental and theoretical knowledgeand, therefore, when using this brochure itis always worthwhile to contact the Com-pany should additional information berequired. Customers are advised to carry out proto-type testing wherever possible.

1.1 Characteristics and Advantages• DX provides maintenance free

operation• DX has a high pU capability• DX exhibits low wear rate• Seizure resistant• Suitable for temperatures from

-40 to +120 °C• High static and dynamic load capacity

• Good frictional properties• No water absorption and therefore

dimensionally stable• Compact and light• Suitable for rotating, oscillating,

reciprocating and sliding movements• DX bearings are prefinished and

require no machining after assembly

2 StructureDX is a composite bearing material devel-oped specifically to operate with marginallubrication and consists of three bondedlayers: a steel backing strip and a sinteredporous bronze matrix, impregnated andoverlaid with a pigmented acetal copoly-mer bearing material.The steel backing provides mechanicalstrength and the bronze interlayer providesa strong mechanical bond for the lining.This construction promotes dimensionalstability and improves thermal conductivity,thus reducing the temperature at the bear-ing surface. DX is designed for use with grease lubrica-tion and the bearing surface is normally

provided with a uniform pattern of indentsThese serve as a reservoir for the greaseand are designed to provide the optimumdistribution of the lubricant over the bear-ing surface.

Fig. 1: DX-microsection

5

2Structure

2.1 Basic FormsStandard Components available from stockThese products are manufactured to Inter-national, National or GGB standarddesigns.Metric and Imperial Sizes• Cylindrical Bushes

- PM pre finished metric range, not machinable in situ, for use with stan-dard journals finished to h6-h8 limits.

- MB machinable metric range, with an allowance for machining in situ.

- Machinable inch range for use as sup-plied or after machining in situ.

• Thrust Washers• Strip Material

Fig. 2: Standard componentsNon Standard Components not available from stockThese products are manufactured to cus-tomers’ requirements with or without GGBrecommendations, and include for exam-ple

• Modified Standard Components• Half Bearings• Flat Components• Pressings• Stampings

Fig. 3: Non standard components

6

3 Properties

3 Properties3.1 Physical Properties

Table 1: Properties of DX

3.2 Chemical PropertiesThe following table provides an indicationof the resistance of DX to various chemicalmedia. It is recommended that the chemi-

cal resistance is confirmed by testing ifpossiple.

Table 2: Chemical resistance of DX

Characteristic Symbol Value DX Unit Comments

Physical Properties

Thermal Conductivity λ 52 W/mK

Coefficient of linear thermal expansion

parallel to surface α1 11 1/106K

normal to surface α2 29 1/106K

Maximum Operating Temperature Tmax 120 °C

Minimum Operating Temperature Tmin –40 °C

MechanicalProperties Compressive Yield Strength σc 380 N/mm² measured on disc 5 mm dia-

meter x 2.45 mm thick.

Maximum Load

Static psta,max 140 N/mm²

Dynamic pdyn,max 70 N/mm²

Electrical Properties Volume resistivity of acetal lining 1015 Ωcm

Chemical % °C Rating

Strong Acids Hydrochloric Acid 5 20 -Nitric Acid 5 20 -Sulphuric Acid 5 20 -

Weak Acids Acetic Acid 5 20 -Formic Acid 5 20 -

Bases Ammonia 10 20 oSodium Hydroxide 5 20 o

Solvents Acetone 20 +Carbon Tetrachloride 20 +

Lubricants and fuels Paraffin 20 +Gasolene 20 +Kerosene 20 +Diesel fuel 20 +Mineral Oil 70 oHFA-ISO46 High Water fluid 70 oHFC-Water-Glycol 70 oHFD-Phosphate Ester 70 +Water 20 oSea Water 20 -

+Satisfactory: Corrosion damage is unlikely to occur.

o

Acceptable: Some corrosion damage may occur but this will not be suf-ficient to impair either the structural integrity or the tribo-logical performance of the material.

-

Unsatisfactory: Corrosion damage will occur and is likely to affect either the structural integrity and/or the tribological performance of the material.

7

4Lubrication

4 Lubrication4.1 Choice of LubricantDX must be lubricated. The choice of lubri-cant depends upon pU and the slidingspeed and the stability of the lubricantunder the operating conditions.

Table 3: Performance of greases

+ Recommendedo Satisfactory- Not recommended

NA Data not available

Manufacturer Grade Type Rating

BP Energrease LS2 Mineral Lithium Soap +Energrease LT2 Mineral Lithium Soap +Energrease FGL Mineral Non Soap oEnergrease GSF Synthetic NA o

Century Lacerta ASD Mineral Lithium/Polymer oLacerta CL2X Mineral Calcium -

Dow Corning Molykote 55M Silicone Lithium Soap oMolykote PG65 PAO Lithium Soap +Molykote PG75 Synthetic/Mineral Lithium Soap +Molykote PG602 Mineral Lithium Soap o

Elf Rolexa.1 Mineral Lithium Soap +Rolexa.2 Mineral Lithium Soap oEpexelf.2 Mineral Lithium/Calcium Soap o

Esso Andok C Mineral Sodium Soap oAndok 260 Mineral Sodium Soap oCazar K Mineral Calcium Soap -

Mobil Mobilplex 47 Mineral Calcium Soap oMobiltemp 1 Mineral Non Soap +

Rocol BG622 White Mineral Calcium Soap oSapphire Mineral Lithium Complex oWhite Food Grease White Oil Clay -

Shell Albida R2 Mineral Lithium Complex +Axinus S2 Mineral Lithium oDarina R2 Mineral Inorganic Non Soap +Stamina U2 Mineral Polyurea oTivela A Synthetic NA +

Sovereign Omega 77 Mineral Lithium oOmega 85 Mineral Polyurea -

Tom Pac Tom Pac NA NA oTotal Aerogrease Synthetic NA +

Multis EP2 NA Lithium -

8

4 Lubrication

GreaseGrease lubrication is the recommendedmethod of lubrication. The performanceratings of different types of grease are indi-cated in Table 3. For environmental tem-peratures above 50 °C the grease should

contain an anti-oxidant additive. Greasescontaining EP additives or significant addi-tions of graphite or MoS2 are not generallyrecommended for use with DX.

OilDX is not generally suitable for use withhydrocarbon oils operating above 115 °C.At these temperatures oxidation of the oilmay produce a low concentration of labileresidues, acid or free radical, which willcause depolymerisation of the DX acetalcopolymer bearing lining. Such oxidation

can also occur after prolonged periods atlower temperatures. In practice, thismeans that DX is not recommended foruse with recirculating oil systems or bathsystems where sump temperatures of70 °C or greater are possible.

Non lubricating fluidsCare must be taken when using DX withnon lubricating fluids as indicated below.

WaterDX is only suitable for operation in waterwhen the load and speed permit full hydro-

dynamic conditions to be established (seeFig. 7).

Water-Oil EmulsionDX is suitable for use with 95/5 water/oilemulsions, however initial operation with

pure oil or grease is recommended beforetransferring to emulsion.

Shock-Absorber OilsDX is not compatible with shock-absorberoils at operating temperature.

PetrolWith petrol as a lubricant at a pU factor of0.21 N/mm² x m/s the wear rate of DX hasbeen found to be about 4-5 times greater

than that of an initially greased bearingunder the same pU conditions.

Kerosene and PolybuteneThe wear rate of DX with these fluids hasbeen found to be equivalent to thatobtained with a light hydrocarbon oil.

Other FluidsPolyester, polyethylene glycol and polygly-col lubricants give similar wear rates withDX to light hydrocarbon oil. With the glycolfluids however the operating temperaturemust not exceed 80 °C because the acetallining of DX could then be attacked bythese fluids.In general, the fluid will be acceptable if itdoes not chemically attack the acetal liningor the porous bronze interlayer. Chemicalresistance data are given in Table 2.Where there is doubt about the suitabilityof a fluid, a simple test is to submerge a

sample of DX material in the fluid for two tothree weeks at 15-20 °C above the operat-ing temperature. The following will usuallyindicate that the fluid is not suitable for usewith DX.• A significant change in the thickness of

the DX material.• A visible change in the bearing surface

from polished to matt.• A visible change in the microstructure of

the bronze interlayer.

9

4Lubrication

4.2 FrictionLubricated DX bearings show negligible‘stick-slip’ and provide smooth slidingbetween adjacent surfaces. The coefficientof friction of lubricated DX depends upon

the actual operating conditions as indi-cated in section 4.3. Where frictional char-acteristics are critical to a design theyshould be established by prototype testing.

4.3 Lubricated EnvironmentsThe following sections describe the basicsof lubrication and provide guidance on theapplication of DX in such environments.

Lubrication There are three modes of lubricated bear-ing operation which relate to the thicknessof the developed lubricant film between thebearing and the mating surface.These three modes of operation dependupon:

• Bearing dimensions• Clearance• Load and Speed• Lubricant Viscosity and Flow

Hydrodynamic lubrication Characterised by:• Complete separation of the shaft from

the bearing by the lubricant film.• Very low friction and no wear of the bea-

ring or shaft since there is no contact.• Coefficients of friction of 0.001 to 0.01.

Fig. 4: Hydrodynamic lubricationHydrodynamic conditions occur when

Mixed film lubricationCharacterised by:• Combination of hydrodynamic and

boundary lubrication.• Part of the load is carried by localised

areas of self pressurised lubricant andthe remainder supported by boundarylubrication.

• Coefficients of friction of 0.01 to 0.10.• Friction and wear depend upon the

degree of hydrodynamic supportdeveloped.

• DX provides low friction and high wearresistance to support the boundary lubri-cated element of the load.

Fig. 5: Mixed film lubrication

p U η⋅7·5------------ B

Di-----⋅≤

(4.3.1) [N/mm²]

10

4 Lubrication

Boundary lubrication Characterised by:• Rubbing of the shaft against the bearing

with virtually no lubricant separating thetwo surfaces.

• Bearing material selection is critical toperformance.

• Shaft wear is likely due to contact bet-ween bearing and shaft.

• The excellent properties of DX materialminimises wear under these conditions.

• The dynamic coefficient of friction withDX is typically 0.02 to 0.1 under bound-ary lubrication conditions.

• The static coefficient of friction with DX istypically 0.03 to 0.15 under boundarylubrication conditions.

Fig. 6: Boundary lubrication

4.4 Characteristics of Fluid Lubricated DX BearingsDX is particularly effective in the mostdemanding of lubricated applications

where full hydrodynamic operation cannotbe maintained, for example:

• High load conditionsIn highly loaded applications operating under boundary or mixed film conditions DX shows excellent wear resistance and low friction.

• Start up and shut down under loadWith insufficient speed to generate a hydrodynamic film the bearing will ope-rate under boundary or mixed film condi-tions.- DX minimises wear- DX requires less start up torque than

conventional metallic bearings.

• Sparse lubricationMany applications require the bearing to operate with less than the ideal lubricant supply, typically with splash or mist lubri-cation only. DX requires significantly less lubricant than conventional metallic bea-rings.

4.5 Design Guidance for Fluid Lubricated Applications

Fig. 7, Page 11 shows the three lubricationregimes discussed above plotted on a

graph of sliding speed vs the ratio of spe-cific load to lubricant viscosity.

In order to use Fig. 7• Using the formulae in Section 5

- Calculate the specific load p- Calculate the shaft surface speed(U)

• Using the viscosity temperature relati-onships presented in Table 4.- Determine the viscosity in centipoise

of the lubricant. Note:Viscosity is a function of the operating tem-perature. If the operating temperature of

the fluid is unknown, a provisional temper-ature of 25 °C above ambient can be used.

11

4Lubrication

Area 1 of Fig. 7• The bearing will operate with boundary

lubrication.• The pU factor will be the major determi-

nant of bearing life.

• DX bearing performance can be estima-ted from the following equations.

• The effective pU Factor epU can be esti-mated from Section 5.8.

If epU/η ≤0.2 then

If 0.2 < epU/η ≤1.0 then

If epU/η >1.0 then

Area 2 of Fig. 7• The bearing will operate with mixed film

lubrication.• pU factor is no longer a significant para-

meter in determining the bearing life.

• DX bearing performance will dependupon the nature of the fluid and theactual service conditions.

Area 3 of Fig. 7• The bearing will operate with hydrodyna-

mic lubrication.• Bearing wear will be determined only by

the cleanliness of the lubri-cant and thefrequency of start up and shut down.

Area 4 of Fig. 7• These are the most demanding opera-

ting conditions.• The bearing is operated under either

high speed or high bearing load to visco-sity ratio, or a combination of both.

• These conditions may cause- excessive operating temperature- and/or high wear rate.

• The bearing performance may be impro-ved:- by use of unindented DX lining- by the addition of one or more grooves

to the bearing- by shaft surface finish Ra <0.05 [µm].

Fig. 7: Design guide for lubricated application

(4.5.1) [h]LH

2000epU

η-----------⎝ ⎠

⎛ ⎞0·5---------------------- aQ aT aS⋅ ⋅ ⋅=

(4.5.2) [h]LH

1000epU

η-----------⎝ ⎠

⎛ ⎞---------------- aQ aT aS⋅ ⋅ ⋅=

(4.5.3) [h]LH

1000epU

η-----------⎝ ⎠

⎛ ⎞2------------------ aQ aT aS⋅ ⋅ ⋅=

epU see (5.8), page 18

Spec

ific

bear

ing

load

p [N

/mm

²]

Journal surface speed U [m/s]

0.1

1.0

10

0.01 0.1 1.0 10

Increased clearances may be necessary

Detail bearing design may be necessary - consult the company

Area 1Effectively dry rubbing

Area 2Mixed film lubrication

Area 3Full hydrodynamic lubrication

Area 4

Vis

cosi

ty η

[cP

]

Conditions:

- Steady unidirectional loading- Continuous, non reversing shaft rotation- Sufficient clearance between shaft and bearing- Sufficient lubricant flow

12

4 Lubrication

Table 4: Viscosity data

4.6 Wear Rate and Relubrication Intervals with Grease lubrication

At specific bearing loads below 100 N/mm²a grease lubricated DX bearing shows onlysmall bedding-in wear of about0.0025 mm. This is followed by little wearduring the early part of the bearing life untilthe lubricant becomes exhausted and thewear rate increases. If the bearing isregreased before the rate of wear starts toincrease rapidly the material will continueto function satisfactorily with little wear.Fig. 8 shows the typical wear pattern.

Under specific loads above 100 N/mm² theinitial bedding-in wear is greater, typicallyabout 0.025 mm, followed by a decreasingwear rate until the bearing exhibits a simi-lar wear/life relationship to that shown inFig. 8.The useful life of the bearing is limited bywear in the loaded area. If this wearexceeds 0.15 mm the grease capacity ofthe indents is reduced and more frequentregreasing of the bearing will be required.

Fretting WearOscillating movements of less than thedimensions of the indent pattern maycause localised wear of the mating surfaceafter prolonged usage. This will result inthe indent pattern becoming transferred

onto the mating surface in contact with theDX bearing and may also give rise to fret-ting corrosion damage. In this situationDSTM material should be considered as analternative to DX.

Fig. 8: Typical wear of DX

cPTemperature [°C] 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

LubricantISO VG 32 310 146 77 44 27 18 13 9.3 7.0 5.5 4.4 3.6 3.0 2.5 2.2

ISO VG 46 570 247 121 67 40 25 17 12 9.0 6.9 5.4 4.4 3.6 3.0 2.6

ISO VG 68 940 395 190 102 59 37 24 17 12 9.3 7.2 5.8 4.7 3.9 3.3

ISO VG 100 2110 780 335 164 89 52 33 22 15 11.3 8.6 6.7 5.3 4.3 3.6

ISO VG 150 3600 1290 540 255 134 77 48 31 21 15 11 8.8 7.0 5.6 4.6

Diesel oil 4.6 4.0 3.4 3.0 2.6 2.3 2.0 1.7 1.4 1.1 0.95

Petrol 0.6 0.56 0.52 0.48 0.44 0.40 0.36 0.33 0.31

Kerosene 2.0 1.7 1.5 1.3 1.1 0.95 0.85 0.75 0.65 0.60 0.55

Water 1.79 1.30 1.0 0.84 0.69 0.55 0.48 0.41 0.34 0.32 0.28

Rad

ial w

ear [

mm

]

Operating life

B

0.05

0.10

B B

Recommended re-greasing interval

End of useful life of pre-lubricated bearing - A

Initial greasing only

Recommended regreasing interval

Bearing continues with low rate of wear when regreased at intervals - B

13

5Design Factors

5 Design FactorsThe main parameters when determiningthe size or calculating the service life for aDX bearing are:• Specific Load Limit plim [N/mm²]• pU Factor [N/mm² x m/s]

• Mating surface roughness Ra [µm]• Mating surface material• Temperature T [°C]• Other environmental factors eg. housing

design, dirt, lubrication.

5.1 Specific LoadThe specific load p is defined as the work-ing load divided by the projected area ofthe bearing and is expressed in N/mm².

Bushes

Thrust Washers

Slide Plates

Specific Load LimitThe maximum load which can be appliedto a DX bearing can be expressed in termsof the Specific Load Limit, which dependson the type of the loading and lubrication Itis highest under steady loads. The valuesof Specific Load Limit specified in Table 5assume good alignment between the bear-ing and mating surface.The Specific Load Limit for DX reduces forbearing operating temperatures in excess

of 40 °C, falling to about half the valuesgiven in Table 5 for temperatures above100 °C.Conditions of dynamic load or oscillatingmovement which produce fatigue stress inthe bearing result in a reduction in the per-missible Specific Load Limit (Fig. 9,Page 14).

Table 5: Specific load limit plim for DX

(5.1.1) [N/mm²]

p FDi B⋅---------------=

(5.1.2) [N/mm²]p 4F

π Do2 Di

2–( )⋅------------------------------=

(5.1.3) [N/mm²]

p FL W⋅--------------=

Load Operating condition Lubrication plim

Steady Intermittent or very slow (below 0.01 m/s) continuous rotation or oscillating motion

Grease or oil 140

Steady Continuous rotation or oscillating motion

Grease or oil(boundary lubrication) 70

Steady or dynamic Continuous rotation or oscillating motion

Oil(hydrodynamic lubrication) 45

14

5 Design Factors

Fig. 9: DX specific load limits plim under dynamic loads or oscillating conditions

5.2 Sliding SpeedThe sliding speed U [m/s] is calculated asfollows:

Continuous RotationBushes Thrust Washers

Oscillating MovementBushes Thrust Washers

The maximum permissible effective pUfactor (epU factor) for grease lubricatedDX bearings is dependent upon the sliding

speed as shown in Fig. 11. For slidingspeeds in excess of 2.5 m/s continuous oillubrication is recommended.

Fig. 11: Maximum epU factor for grease lubrication

Spe

cific

load

lim

it p l

im [N

/mm

²]

Cycles Q1041

10

100

105 106 107 108

U Di π N⋅ ⋅60 103⋅------------------------=

(5.2.1) [m/s]

U

Do Di+2

---------------- π N⋅ ⋅

60 103⋅-----------------------------------=

(5.2.2) [m/s]

UDi π⋅60 103⋅--------------------- 4ϕ Nosz⋅

360----------------------⋅=

(5.2.3) [m/s]

U

Do Di+2

---------------- π⋅

60 103⋅------------------------- 4ϕ Nosz⋅

360----------------------⋅=

(5.2.4) [m/s]

Fig. 10: Oscillating cycle ϕ

ϕ ϕ

412 3

epU

Fac

tor [

N/m

m² x

m/s

]

Speed [m/s]

00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

15

5Design Factors

5.3 pU FactorThe useful operating life of a DX bearing isgoverned by the pU factor, which is calcu-lated as follows:

5.4 LoadIn addition to its contribution to the pU fac-tor the type and direction of the appliedload also affects the performance of a DXbearing. This is accomodated in the calcu-

lation of the bearing service life by thespeed/load application factor aQ shown inFigs. 15-17.

Type of Load

Fig. 12: Steady load, vertically down-wards, bush stationary, shaft rotating. Lubricant drains to loaded area

Fig. 13: Steady load, vertically upwards, bush stationary, shaft rotating. Lubricant drains away from loaded area

Fig. 14: Rotating load, shaft stationary, bush rotating

pU p U⋅=

(5.3.1) [N/mm² x m/s]

F2---

F2---

F

F2---

F2---

F

F2---

F2---

F

16

5 Design Factors

Fig. 15: Speed/Load factor aQ for MB range bushes - unmachined

Fig. 16: Speed/Load factor aQ for PM range and MB range bushes - machined

Fig. 17: Speed/Load factor aQ for thrust washers

Note: aQ = 1 for slideways

Rubbing speed U [m/s]

00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

Rotating load

Steady load verticallydownwards

Dynamic load or steady loadnot downwards

Spee

d/Lo

ad fa

ctor

aQ


00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

Rotating load

Steady load verticallydownwards

Dynamic load or steady loadnot downwards

Spe

ed/L

oad

fact

or a

Q


00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

Spee

d/Lo

ad fa

ctor

aQ

17

5Design Factors

5.5 TemperatureThe useful life of a DX bearing dependsupon the operating temperature. The per-formance of grease lubricated DXdecreases at bearing temperatures above40 °C. This loss of performance is relatedto both material and lubricant effects.For a given pU Factor the operating tem-perature of the bearing depends upon the

temperature of the surrounding environ-ment and the heat dissipation properties ofthe housing.In calculating the service life of DX theseeffects are accomodated by the applicationfactor aT shown in Fig. 18.

Fig. 18: DX application factor aT

5.6 Mating SurfaceThe wear rate of DX is strongly dependentupon the roughness of the mating counter-face. For optimum bearing performancethe mating surface should be ground to

better than 0.4 µm Ra. This effect is acco-modated by the mating surface finish appli-cation factor aS shown in Fig. 19.

Fig. 19: DX application factor aS

Bearing environment temperature Tamb [°C]

00

0.2

0.4

10 20 30 40 50

0.8

0.6

1

Housings offering average to good heat dissipation

Housings made of light metal pressings

Non-metallic housings

60 70 80 90 100

App

licat

ion

fact

or a

T

Mating surface finish Ra [µm]

00

0.2

0.4

0.25 0.50

0.8

0.6

1

0.75 1.00 1.25

App

licat

ion

fact

or a

S

18

5 Design Factors

5.7 Bearing SizeFrictional heat generated at the bearingsurface and dissipated through the shaftand housing depends both on the operat-ing conditions (i.e. pU factor) and the bear-ing size.

For a give pU condition a large bearing willrun hotter than a smaller bearing. Thebearing size factor aB shown in Fig. 20takes account of this effect.

Fig. 20: Bearing size factor aB

Note: aB = 1 for slideways

5.8 Estimation of Bearing Service Life with Grease Lubrication

Calculation Parameters

Operating Conditions

Bea

ring

size

fact

ora B

Journal diameter DJ [mm]

80.1

0.2

0.3

9 10

0.40.5

0.80.60.70.91.0

1.5

3.0

2.0

15 20 30 40 50 70 100 150 200 500

Bushes Thrust Washers Slide Plates Unit

Bearing diameter DiBearing outsidediameter

Do Strip Length L [mm]

Bearing width B Bearing insidediameter

Di Strip Width W [mm]

Load F [N]

Rotational Speed (Continuous) N [1/min]

Oscillating Frequency Nosz [1/min]

Angular movement about mean position ϕ [°]

Specific Load Limit see Table 5, Page 13 [N/mm²]

Application Factor aQ see Fig. 15-17, Page 16 [-]

Application Factor aT see Fig. 18, Page 17 [-]

Application Factor aS see Fig. 19, Page 17 [-]

Bearing Size Factor aB see Fig. 20, Page 18 [-]

19

5Design Factors

Calculate p from the equations in 5.1 on Page 13. Calculate U from the equations in 5.2 on Page 14.Calculate pU from the equation in 5.3 on Page 15.

Calculate High Load Factor aE

Note:If aE >10000, or aE <0, the bearing is over-loaded.

Calculate Effective pU Factor epU

Note:Check that epU is less than the limit for thesliding speed U set in Fig. 11. If NOT,

increase the bearing length or use continu-ous lubrication.

Estimate Bearing LifeIf epU < 1.0 then If epU > 1.0 then

Estimate Re-greasing Interval

Oscillating Motion and Dynamic LoadsOscillating MotionCalculate number of cycles

Dynamic LoadsCalculate number of cycles

where R = Number of times bearing isregreased during total life required.Check that ZT (or CT) is less than the totalnumber of cycles Q given in Fig. 9 foractual bearing specific load p.If ZT (or CT) > Q then life will be limited byfatigue after Q cycles.

If ZT (or CT) < Q then life will be limited bywear after ZT cycles.If the estimated life or total cycles areinsufficient or the regreasing intervals aretoo frequent, increase the bearing lengthor diameter, or consider drip feed or con-tinuous oil lubrication, the quantity to beestablished by test.

aEplimplim p–----------------=

(5.8.1) [–]

plim see Table 5, Page 13

epU aE pU⋅aB

-------------------=

(5.8.2) [–]

LH3000epU------------- aQ aT aS⋅ ⋅ ⋅=

(5.8.3) [h]

LH3000epU( )2 ·4--------------------- aQ aT aS⋅ ⋅ ⋅=

(5.8.4) [h]

LRGLH2------=

(5.8.5) [h]

ZT LRG Nosz 60 R 2+( )⋅⋅ ⋅=

(5.8.6) [–]CT LRG C 60 R 2+( )⋅⋅ ⋅=

(5.8.7) [–]

20

5 Design Factors

5.9 Worked Examples

PM cylindrical BushGivenLoad Details Steady Load Inside Diameter Di 40 mm

Direction: down Length B 30 mmShaft Steel Bearing Load F 15000 N

ambient Temperature Rotational Speed N 30 1/mingood heat conditions Ra 0.3 µm

Calculation Constants and Application FactorsSpecific Load Limit plim 70 N/mm² (Table 5, Page 13)Application Factor aT 1.0 (Fig. 18, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 19, Page 17)Bearing Size Factor aB for ø 40 0.98 (Fig. 20, Page 18)Application Factor for PM bush aQ 1.8 (Fig. 16, Page 16)

Calculation Ref ValueSpecific Load p [N/mm²]

(5.1.1), page 13

Sliding Speed U [m/s]

(5.2.1), page 14

High Load FactoraE [-] (must be >0)

(5.8.1), page 19

epU Factor[-]

(5.8.3), page 19

LifeLH [h] for epU<1

(5.8.3), page 19

LRG [h](5.8.3), page 19

p FDi B⋅-------------- 15000

40 30⋅------------------ 12 5,= = = 12.5

U Di π N⋅ ⋅

60 103⋅----------------------- 40 π 30⋅ ⋅

60000-------------------------- 0 063,= = =0.063

aEplimplim p–--------------- 70

70 12 5,–------------------------ 1 22,= = = 1.22

12.5

epU aE pU⋅aB

------------------- 1 22, 12 5, 0 063,⋅ ⋅0 98,

------------------------------------------------------ 0 98,== =12.5 0.0631.22 0.980.98

LH3000epU------------- aQ aT aS⋅ ⋅ ⋅ 3000

0 98,------------- 1⋅ 8, 1 0, 0 98,⋅ ⋅ 5400= = =0.98 54001.8 0.981.01.8

LRGLH2------ 5400

2------------- 2700= = =

PM cylindrical BushGivenLoad Details Steady Load Inside Diameter Di 90 mm

Direction: up Length B 60 mmShaft Steel Bearing Load F 45000 N

Temperature 80 °C Rotational Speed N 20 1/mingood heat conditions Ra 0.3 µm

Calculation Constants and Application FactorsSpecific Load Limit plim at 80 °C 46.7 N/mm² (Table 5, Page 13)Application Factor aT 0.4 (Fig. 18, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 19, Page 17)Bearing Size Factor aB for ø 40 0.70 (Fig. 20, Page 18)Application Factor for PM bush aQ 1.0 (Fig. 16, Page 16)


(5.1.1), page 13


(5.2.1), page 14

High Load FactoraE [-](must be >0)

(5.8.1), page 19

epU Factor[-]

(5.8.3), page 19

LifeLH [h] for epU>1

(5.8.3), page 19

LRG [h](5.8.3), page 19

p FDi B⋅-------------- 45000

90 60⋅------------------ 8= = =8.33

U Di π N⋅ ⋅

60 103⋅----------------------- 90 π 20⋅ ⋅

60000-------------------------- 0 094,= = =0.094

aEplimplim p–--------------- 46 7,

46 7, 8 33,–------------------------------- 1 22,= = = 1.2246.746.7 8.33

epU aE pU⋅aB

------------------- 1 22, 8 33, 0 094,⋅ ⋅0 70,

------------------------------------------------------ 1 36,== =1.22 0.0948.33

0.70 1.36

LH3000epU( )2 4,---------------------- aQ aT aS⋅ ⋅ ⋅ 3000

1 36, 2 4,-------------------- 1⋅ 0, 0 4, 0 98,⋅ ⋅ 562= = =5620.980.42.4 2.41.36

1.0

LRGLH2------ 562

2----------== = 281

Thrust washerGivenLoad Details Steady Load Inside Diameter Di 26 mm

Direction: down Outside Diameter Do 44 mmShaft Steel Bearing Load F 10000 N

ambient Temperature Rotational Speed N 10 1/mingood heat conditions Ra 0.3 µm

Calculation Constants and Application FactorsSpecific Load Limit plim 70 N/mm² (Table 5, Page 13)Application Factor aT 1.0 (Fig. 18, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 19, Page 17)Bearing Size Factor aB for ø 35 0.90 (Fig. 20, Page 18)Application Factor for Thrust washers aQ 1.0 (Fig. 17, Page 16)


(5.1.2), page 13


(5.2.2), page 14


(5.8.1), page 19

epU Factor[-]

(5.8.2), page 19


(5.8.3), page 19

LRG [h](5.8.3), page 19

p 4 F⋅π Do

2 Di2–( )⋅

-------------------------------- 4 10000⋅π 442 262–( )⋅---------------------------------- 10 11,= = =10.11

UDo Di+2

---------------- π N⋅ ⋅

60 103⋅----------------------------------

44 26+2

----------------- π 10⋅ ⋅

60 103⋅------------------------------------- 0 018,= = =0.018

aEplimplim p–--------------- 70

70 10 11,–--------------------------- 1 169,= = =10.11 1.169

epU aE pU⋅aB

------------------- 1 169, 10 11, 0 018,⋅ ⋅0 90,

------------------------------------------------------------- 0 236,== = 0.901.169 10.11 0.018 0.236

LH3000epU------------- aQ aT aS⋅ ⋅ ⋅ 3000

0 236,----------------- 1⋅ 0, 1 0, 0 98,⋅ ⋅ 12460= = = 124601.0 0.981.00.236

LRGLH2------ 12460

2---------------- 6230= = =

SlidewaysGivenLoad Details Steady Load Length L 50 mm

Direction: down Width W 20 mmMating Surface Steel (Ra = 0.3 µm) Bearing Load F 20000 N

Temperature 80 °C Stroke 15 mmgood heat conditions Frequency 10 1/min

Calculation Constants and Application FactorsSpecific Load Limit plim at 80 °C 93 N/mm² (Table 5, Page 13)Application Factor aT 0.4 (Fig. 18, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 19, Page 17)Bearing Size Factor aB 1.0 (Fig. 20, Page 18)Application Factor for Slideways aQ 1.0 (Fig. 17, Page 16)


(5.1.3), page 13



(5.8.1), page 19

epU Factor[-]

(5.8.2), page 19


(5.8.3), page 19

LRG [h](5.8.3), page 19

p FL W⋅-------------- 20000

50 20⋅------------------ 20= = =

U 15 2 10⋅ ⋅60 10 3⋅--------------------------- 0 005,= =0.005

aEplimplim p–--------------- 93

93 20–----------------- 1 27,= = =1.27

epU aE pU⋅aB

------------------- 1 27, 20 0 005,⋅ ⋅1 0,

----------------------------------------------- 0 127,== = 1.271.0

0.005 0.127

LH3000epU------------- aQ aT aS⋅ ⋅ ⋅ 3000

0 127,----------------- 1⋅ 0, 0 4, 0 98,⋅ ⋅ 9260= = =0.127 1.0 0.4 0.98

LRGLH2------ 9260

2------------- 4630= = =

21

6Data Sheet

6 Data Sheet6.1 Data for bearing design calculations

Application:

Quantity

Dimensions in mm

Inside Diameter Di

Width B

Outside Diameter Do

Length of slideplate LWidth of slideplate WThickness of slideplate sS

Radial load F [N]or specific load p [N/mm²]

Axial load F [N]or specific load p [N/mm²]

Oscillating frequency Nosz [1/min]

Rotational speed N [1/min]Speed U [m/s]Length of Stroke LS [mm]Frequency of Stroke [1/min]Oscillating cycle ϕ [°]

Continuous operation

Load

Service hours per day

Days per yearOperating timeIntermittent operation

Movement

Shaft DJ

Bearing Housing DH

Fits and Tolerances

Ambient temperature Tamb [°]

Operating Environment

Non metal housing with poor heat transfer properties

Light pressing or insulated housing with poor heat transfer properties

Housing with good heat transfer properties

Material

Mating surface

Surface finish Ra [µm]Hardness HB/HRC

Process FluidLubricant

Alternate operation in water and dry

Dry

Lubrication

Process fluid lubrication

Continuous lubrication

Initial lubrication only

Hydrodynamic conditions

Dynamic viscosity η

Required service life LH [h]

Service life

Rotational movement Steady load Rotating load Oscillating movement

Cylindrical Bush Thrust Washer Slideplate

Existing Design New Design

Special (Sketch)

Linear movement

B

Di

Do

Di Do

Ws S

sT

L

Customer DataCompany:Street:

Project:Name:Tel.:

Date:Signature:Fax:

City:Post Code:

22

7 Bearing Assembly

7 Bearing Assembly7.1 Dimensions and TolerancesFor optimum performance it is essentialthat the correct running clearance is usedand that both the diameter of the shaft andthe bore of the housing are finished to thelimits given in the tables.If the bearing housing is unusually flexiblethe bush will not close in by the calculated

amount and the running clearance will bemore than the optimum. In these circum-stances the housing should be boredslightly undersize or the journal diameterincreased, the correct size being deter-mined by experiment.

7.2 Tolerances for minimum clearance

Grease lubricationThe minimum clearance required for satis-factory performance of DX depends uponthe pU factor, the sliding speed and theenvironmental temperature, any one orcombination of which may reduce thediametral clearance in operation due toinward thermal expansion of the DX poly-mer lining. It is therefore necessary tocompensate for this.Fig. 21 shows the minimum diametralclearance plotted stepped against journaldiameter at an ambient 20 °C. Where thestepped lines show a change of clearancefor a given journal diameter, the lowervalue is used. The superimposed straight lines indicatethe minimum permissible diametral clear-

ance for various values of pUu (Fig. 21),where pU is calculated as in 5.3 onPage 15, and u is a sliding speed factor forspeeds in excess of 0.5 m/s given inFig. 22.If the clearance indicated for a pUu factorlies below the stepped lines the recom-mended standard shaft may be used. Ifabove, the shaft size must be reduced toobtain the clearance indicated on the verti-cal axis of the relevant figure.Under slow speed and high load conditionsit may be possible to achieve satisfactoryperformance with diametral clearancesless than those indicated. But adequateprototype testing is recommended in suchcases.

23

7Bearing Assembly

Fig. 21: Minimum clearance for PM prefinished and MB machinable metric range machined to H7 bore

Fig. 22: Rubbing speed factor u

Rec

omm

ende

d m

inim

um d

iam

etra

l cle

aran

ce C

D [m

m]

Journal diameter DJ [mm]

100.01

0.02

0.03

20 30 40 50 60 80 10070 90

0.04

0.05

0.06

0.08

0.1

0.15

0.2

PM range Use standard clearan-ces unless fine running required

Increase stan-dard clearances to level indicated by pUu line

MB range

2.8 N/mm² x m/s

1.0

0.5

0.35

0.25

0.15

0.10

pUu

Rub

bing

spe

ed fa

ctor

u


0.5

1

2

0 0.5 1

1.5

01.5 2 2.5

24

7 Bearing Assembly

Fluid LubricationThe minimum clearance required for jour-nal bearings operating under hydrody-namic or mixed film conditions for a rangeof shaft rotational speeds and diameters is

shown in Fig. 23 It is recommended thatthe bearing performance under minimumclearance conditions be confirmed by test-ing if possible.

Fig. 23: DX minimum clearances - bush diameters Di 10-50 mm

Allowance for Thermal ExpansionFor operation in high temperature environ-ments the clearance should be increasedby the amounts indicated by Fig. 24 to

compensate for the inward thermal expan-sion of the bearing lining.

Fig. 24: Recommended increase in diametral clearanceIf the housing is non-ferrous then the boreshould be reduced by the amounts given inTable 6, in order to give an increased inter-

ference fit to the bush, with a similar reduc-tion in the journal diameter additional tothat indicated by Fig. 24.

Dia

met

ral c

lear

ance

CD

[mm

]

Speed N [rev/min]

00.01

0.02

100

0.03

0.05

0.06

0.04

1000

Detail design required for rubbing speeds above 3 m/s

50 45 40 35 3025

20

15

18

12

10

Incr

ease

in m

inim

um d

iam

etra

l cle

aran

ce [m

m]

Environmental temperature Tamb [° C]

0.01

0.02

0 40 60 800

20 100 120 140 160

0.03

0.04

0.05

25

7Bearing Assembly

Table 6: Allowance for high temperature

7.3 Counterface DesignDX bearings may be used with all conven-tional mating surface materials. Hardeningof steel journals is not required unlessabrasive dirt is present or if the projectedbearing life is in excess of 2000 hours, inwhich cases a minimum shaft hardness of350 HB is recommended.A ground surface finish of better than0.4 µm Ra is recommended. The finaldirection of machining of the mating sur-face should preferably be the same as thedirection of motion relative to the bearingin service.DX is normally used in conjunction with fer-rous journals and thrust faces, but in dampor corrosive surroundings stainless steel orhard chromium plated mild steel, alterna-

tively WH shaft sleeves (Standard pro-gramm available) are recommended.When plated mating surfaces are specifiedthe plating should possess adequatestrength and adhesion, particularly if thebearing is to operate with high fluctuatingloads.The shaft or thrust collar used in conjunc-tion with the DX bush or thrust washermust extend beyond the bearing surface inorder to avoid cutting into it. The matingsurface must also be free from grooves orflats, the end of the shaft should be given alead-in chamfer and all sharp edges orprojections which may damage the softpolymer lining of the DX must be removed.

Fig. 25: Counterface design

Housing material Reduction in housing diameter per 100 °C rise

Reduction in shaft diameter per 100 °C rise

Aluminium alloys 0.1% 0.1% + values from Fig. 24Copper base alloys 0.05% 0.05% + values from Fig. 24Steel and cast iron Nil values from Fig. 24Zinc base alloys 0.15% 0.15% + values from Fig. 24

incorrect correct

26

7 Bearing Assembly

7.4 InstallationImportant NoteCare must be taken to ensure that the DXlining material is not damaged during theinstallation.

Fitting of BushesThe bush is inserted into its housing withthe aid of a stepped mandrel, preferablymade from case hardened mild steel, asshown in Fig. 26. The following should benoted to avoid damage to the bearing:

• Housing diameter is as recommended• 15-30° lead-in chamfer on housing• edges of lead-in chamfer are deburred• The bush must be square to the housing• Light smear of oil on bush OD

Fig. 26: Fitting of bushes

Insertion ForcesFig. 27 gives an indication of the maximuminsertion force required to correctly installstandard DX bushes.

Fig. 27: Maximum insertion force Fi

Do <55 mm Do >55 mm Do >120 mm

15° -30°

Mounting Ring

Note:Lightly oil back of bush to assist assembly.

for D

H ≤

125

= 0.

8fo

r DH

> 1

25 =

2

for D

H ≤

125

= 0.

8fo

r DH

> 1

25 =

2

DiDi

DH

DH

Max

imum

inse

rtion

forc

e [N

/mm

uni

t len

gth]

Bush bore diameter Di [mm]

200

400

1000

0 30 40 50

800

0

20 100

600

10

27

7Bearing Assembly

AlignmentAccurate alignment is an important consid-eration for all bearing assemblies. With DXbearings misalignment over the length of a

bush (or pair of bushes), or over the diam-eter of a thrust washer should not exceed0.020 mm as illustrated in Fig. 28.

Fig. 28: Alignment

SealingWhile DX can tolerate the ingress of somecontaminant materials into the bearingwithout loss of performance, where there isthe possibility of highly abrasive material

entering the bearing, a suitable sealingarrangement, as illustrated in Fig. 29should be provided.

Fig. 29: Recommended sealing arrangements

Axial LocationWhere axial location is necessary, it is gen-erally advisable to fit DX thrust washers inconjunction with DX bushes, even whenthe axial loads are low. Experience has

shown that fretting debris from unsatisfac-tory locating surfaces can enter an adja-cent DX bush and adversely affect thebearing life and performance.

Fitting of Thrust WashersDX thrust washers should be located onthe outside diameter in a recess as shownin Fig. 30. The inside diameter must beclear of the shaft in order to prevent con-tact with the steel backing of the DX mate-rial. The recess diameter should be 0.125mm larger than the washer diameter andthe depth as given in the product tables.

If there is no recess for the thrust washerone of the following methods of fixing maybe used:• two dowel pins• two screws• adhesive.

28

7 Bearing Assembly

Fig. 30: Installation of Thrust-Washer

Important Note• Dowel pins should be recessed 0.25 mm

below the bearing surface• Screws should be countersunk 0.25 mm

below the bearing surface• DX must not be heated above 130 °C• Contact adhesive manufacturers for gui-

dance on the selection of suitable adhe-sives

• Protect the bearing surface to preventcontact with adhesive

• Ensure the washer ID does not touch theshaft after assembly

• Ensure that the washer is mounted withthe steel backing to the housing.

SlidewaysDX strip material for use as slideway bear-ings should be installed using one of thefollowing methods:

• countersunk screws• adhesives• mechanical location.

Fig. 31: Mechanical location of DX slideways

29

8Machining

8 Machining8.1 Machining PracticeThe acetal copolymer lining of DX hasgood machining characteristics and can betreated as a free cutting brass in mostrespects. The indents in the bearing sur-face may lead to the formation of burrs orwhiskers due to the resilience of the liningmaterial, but this can be avoided by usingmachining methods which remove the lin-ing as a ribbon, rather than a narrowthread.

When machining DX it is recommendedthat not more than 0.125 mm is removedfrom the lining thickness in order to ensurethat the lubricant capacity of the indentsremaining after machining is not signifi-cantly reduced.Boring, reaming and broaching are all suit-able machining methods for use with DX.The recommended tool material is highspeed steel or tungsten carbide.

8.2 BoringFig. 32 illustrates a recommended boringtool which should be mounted with its axisat right angles to the direction of feed.The essential characteristic required in theboring tool is a tip radius greater than 1.5mm, which combined with a side rake of30° will produce the ribbon effect required.

Cutting speeds should be high, the opti-mum between 2.0 and 4.5 m/s. The feedshould be low, in the range 0.05/0.025 mmfor cuts of 0.125 mm, the lower feedsbeing used with the higher cutting speeds.Satisfactory finishes can usually beobtained machining dry and an air blastmay facilitate swarfe removal. The use ofcoolant is not detrimental.

Fig. 32: Boring tool for DX

12°

setting flatCentre line through tip of tool to be on horizontal plane through centre of work piece

Section “AA“

20°A

30°Dia to suit holder

0.75 mm x 3°

2.5 mm rad

A

Tungsten carbide tip “H“ or “N“ wickmen or equivalent 1.5 mm thick

25°

0.75 mm x 3°

30

8 Machining

8.3 ReamingMB-DX-bushes can be reamed satisfacto-rily by hand with a straight-fluted expand-ing reamer. For best results the reamershould be sharp, the cut 0.025-0.050 mm

and the feed slow. Where hand reaming isnot desired machining speeds of about0.05 m/s are recommended with the cutsand feeds as for boring.

8.4 BroachingFig. 33 shows broaches suitable for finish-ing MB-DX-bushes up to 65 mm diameter.

The broach should be used dry, at a speedof 0.1-0.5 m/s.

Fig. 33: Suitable broaches for MB-DXUse the single tooth version where thebush is less than 25 mm long, and the dou-ble tooth broach for longer bushes or fortwo or more bushes together.

Bush Width PitchB P

Over To10 13 313 20 420 30 530 50 5.550 70 670 95 795 130 8

Diameter

Á´ Min. ass. bore +0.013+0.000

´B´ Nominal bore +0.038+0.025

Ć´ Nominal bore +0.015+0.005

Min. ass. bore = Do min - 2 x s3 max

Nominal bore = min. finished bore

´B1´* Nominal bore -0.065-0.076

Min. length of Pilot Guide

LminSingle bush B + 62 or morebushes in

line

B + 6 +bush spacing

5°

6 mm

3 mm rad polished1.5 mm rad

1.5 mm

2LL

Á´dia´B1´dia´B´dia´Ć´dia

C dia - 3 mm

0.75 mm x 45°1.5 mm rad

2LL

´B´diaĆ´dia Á´dia

Pitch P0.75 mm rad

1.5 mm

5°

45 45

2

0.75 mm land

1.5 mm1.5 mm rad polished

Alternative - single tooth cutter

Detail of tooth form

Double tooth cutter

* First tooth of double tooth cutter

31

8Machining

If it is necessary to make up a special formof broach the following points should benoted:• Adequate provision should be made for

locating the bush by providing a pilot tosuit the bore of the bush when pressedhome. A rear support shoulder shouldlocate in the broached bore of the bushafter cutting. Alternatively, special guidesmay be provided external to the work-piece.

• If two bushes are to be broached in line,then the pilot guide and rear supportshould be longer than the distance bet-ween the two bushes.

• For large bushes it may be necessary toprovide axial relief along the length ofthe pilot guide and rear support, in orderto reduce the broaching forces.

• Unless a guided broach is used, the toolwill follow the initial bore alignment of thebush, broaching cannot improve concen-tricity and parallelism unless externalguides are used.

In general owing to the variation in wallthickness of large diameter bushes,broaching is not suitable for finishing bores

of more than 60 mm diameter unless exter-nal guides are used.

8.5 VibrobroachingThis technique may also be used. A singlecutter is propelled with progressive recipro-cating motion with a vibration frequency oftypically 50 Hz. The cutter should have aprimary rake of 1.5° for 0.5 mm. A cut of

0.25 mm on diameter may be made at anaverage cutting speed of 0.15 m/s to givea surface finish of better than 0.8 µm Ra,which is acceptable.

8.6 Modification of componentsThe modification of DX bearing compo-nents requires no special procedures. Ingeneral it is more satisfactory to performmachining or drilling operations from thepolymer lining side in order to avoid burrs.When cutting is done from the steel side,

the minimum cutting pressure should beused and care taken to ensure that anysteel or bronze particles protruding into theremaining bearing material, and all burrs,are removed.

8.7 Drilling Oil HolesBushes should be adequately supportedduring the drilling operation to ensure that

no distortion is caused by the drilling pres-sure.

8.8 Cutting Strip MaterialDX strip material may be cut to size by anyone of the following methods. Care mustbe taken to protect the bearing surfacefrom damage and to ensure that no defor-mation of the strip occurs.

• Using side and face cutter, or slittingsaw, with the strip held flat and securelyon a horizontal milling machine.

• Cropping• Guillotine (For widths less than 90 mm

only)• Water-jet cutting, Laser cutting

32

9 Electroplating

9 ElectroplatingDX ComponentsTo provide corrosion protection the mildsteel backing of DX may be electroplatedwith most of the conventional electroplat-ing metals including the following:• zinc ISO 2081-2• cadmium ISO 2081-2• nickel ISO 1456-8• hard chromium ISO 1456-8.

For the harder materials if the specifiedplating thickness exceeds approximately5 µm then the housing diameter should beincreased by twice the plating thickness inorder to maintain the correct assembledbearing bore size.Where electrolytic attack is possible testsshould be conducted to ensure that all thematerials in the bearing environment aremutually compatible.

Mating SurfacesDX can be used against hard chromeplated materials and care should be takento ensure that the recommended shaft

sizes and surface finish are achieved afterthe plating process.

33

10Standard Products

10 Standard Products10.1PM-DX cylindrical bushes

All dimensions in mm

dL0.3

min

.

20˚ ± 8˚Co

Ci

B

s 3D

i(D

i,a)

Do

120

Dimensions and tolerances follow ISO 3547 and GSP-Specifications

Detail Z

Split

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a Ass. in H7 housing

ClearanceCD Oil hole-ø

dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

PM0808DX

8 10

0.9800.955

8.257.75

h8

8.0007.978

H7

10.01510.000

8.1058.040

0.1270.040 No holePM0810DX 10.25

9.75

PM0812DX 12.2511.75

PM1010DX

10 12

10.259.75

10.0009.978

12.01812.000

10.10810.040

0.1300.040

3

PM1012DX 12.2511.75

4PM1015DX 15.2514.75

PM1020DX 20.2519.75

PM1210DX

12 14

10.259.75

12.00011.973

14.01814.000

12.10812.040

0.1350.040

3

PM1212DX 12.2511.75

4

PM1215DX 15.2514.75

PM1220DX 20.2519.75

PM1225DX 25.2524.75

PM1415DX

14 16

15.2514.75

14.00013.973

16.01816.000

14.10814.040PM1420DX 20.25

19.75

PM1425DX 25.2524.75

PM1510DX15 17

10.259.75 15.000

14.97317.01817.000

15.10815.040

3

PM1512DX 12.2511.75 4

Outside Co and Inside Ci chamfers

a = Chamfer Co machined or rolled at the opinion of the manufacturer

b = Ci can be a radius or a chamfer in accordance with ISO 13715

Wall thickness s3

Co (a)Ci (b)

machined rolled0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4

1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.51.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7

Wall thickness s3

Co (a)Ci (b)

machined rolled2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7

2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0

34

10 Standard Products

PM1515DX

15 17

0.9800.955

15.2514.75

h8

15.00014.973

H7

17.01817.000

15.10815.040

0.1350.040

4

PM1520DX 20,2519,75

PM1525DX 25.2524.75

PM1615DX

16 18

15.2514.75

16.00015.973

18.01818.000

16.10816.040PM1620DX 20.25

19.75

PM1625DX 25.2524.75

PM1815DX

18 20

15.2514.75

18.00017.973

20.02120.000

18.11118.040

0.1380.040PM1820DX 20.25

19.75

PM1825DX 25.2524.75

PM2010DX

20 23

1.4751.445

10.259.75

20.00019.967

23.02123.000

20.13120.050

0.1640.050

PM2015DX 15.2514.75

PM2020DX 20.2519.75

PM2025DX 25.2524.75

PM2030DX 30.2529.75

PM2215DX

22 25

15.2514.75

22.00021.967

25.02125.000

22.13122.050

6

PM2220DX 20.2519.75

PM2225DX 25.2524.75

PM2230DX 30.2529.75

PM2415DX

24 27

15.2514.75

24.00023.967

27.02127.000

24.13124.050

PM2420DX 20.2519.75

PM2425DX 25.2524.75

PM2430DX 30.2529.75

PM2515DX

25 28

15.2514.75

25.00024.967

28.02128.000

25.13125.050

PM2520DX 20.2519.75

PM2525DX 25.2524.75

PM2530DX 30.2529.75

PM283130DX

28

31 30.2529.75

28.00027.967

31.02531.000

28.13528.050

0.1680.050

PM2820DX

32

1.9701.935

20.2519.75

32.02532.000

28.15528.060

0.1880.060

PM2825DX 25.2524.75

PM2830DX 30.2529.75

PM3020DX

30 34

20.2519.75

30.00029.967

34.02534.000

30.15530.060

PM3025DX 25.2524.75

PM3030DX 30.2529.75

PM3040DX 40.2539.75

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

35

10Standard Products

PM3220DX

32 36

1.9701.935

20.2519.75

h8

32.00031.961

H7

36.02536.000

32.15532.060

0.1940.060

6

PM3230DX 30.2529.75

PM3235DX 35.2534.75

PM3240DX 40.2539.75

PM3520DX

35 39

20.2519.75

35.00034.961

39.02539.000

35.15535.060

PM3530DX 30.2529.75

PM3535DX 35.2534.75

PM3550DX 50.2549.75

PM3635DX 36 40 35.2534.75

36.00035.961

40.02540.000

36.15536.060

PM3720DX 37 41 20.2519.75

37.00036.961

41.02541.000

37.15537.060

PM4020DX

40 44

20.2519.75

40.00039.961

44.02544.000

40.15540.060

8

PM4030DX 30.2529.75

PM4040DX 40.2539.75

PM4050DX 50.2549.75

PM4520DX

45 50

2.4602.415

20.2519.75

45.00044.961

50.02550.000

45.19545.080

0.2340.080

PM4530DX 30.2529.75

PM4540DX 40.2539.75

PM4545DX 45.2544.75

PM4550DX 50.2549.75

PM5030DX

50 55

30.2529.75

50.00049.961

55.03055.000

50.20050.080

0.2390.080

PM5040DX 40.2539.75

PM5045DX 45,2544,75

PM5050DX 50.2549.75

PM5060DX 60.2559.75

PM5520DX

55 60

20.2519.75

55.00054.954

60.03060.000

55.20055.080

0.2460.080

PM5525DX 25.2524.75

PM5530DX 30.2529.75

PM5540DX 40.2539.75

PM5550DX 50.2549.75

PM5560DX 60.2559.75

PM6030DX

60 65

30.2529.75

60.00059.954

65.03065.000

60.20060.080

PM6040DX 40.2539.75

PM6050DX 50.2549.75

PM6060DX 60.2559.75

PM6070DX 70.2569.75

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

36


PM6540DX

65 70

2.4502.384

40.2539.75

h8

65.00064.954

H7

70.03070.000

65.26265.100

0.3080.100

8

PM6550DX 50.2549.75

PM6560DX 60.2559.75

PM6570DX 70.2569.75

PM7040DX

70 75

40.2539.75

70.00069.954

75.03075.000

70.26270.100

PM7050DX 50.2549.75

PM7060DX 60,2559,75

PM7065DX 65.2564.75

PM7070DX 70.2569.75

PM7080DX 80.2579.75

PM7540DX

75 80

40.2539.75

75.00074.954

80.03080.000

75.26275.100

9.5

PM7560DX 60.2559.75

PM7580DX 80.2579.75

PM8040DX

80 85

40.5039.50

80.00079.954

85.03585.000

80.26780.100

0.3130.100

PM8050DX 50,5049,50

PM8060DX 60.5059.50

PM8080DX 80.5079.50

PM80100DX 100.5099.50

PM8530DX

85 90

30.5029.50

85.00084.946

90.03590.000

85.26785.100

0.3210.100

PM8540DX 40.5039.50

PM8560DX 60.5059.50

PM8580DX 80.5079.50

PM85100DX 100.5099.50

PM9040DX

90 95

40.5039.50

90.00089.946

95.03595.000

90.26790.100

PM9060DX 60.5059.50

PM9080DX 80.5079.50

PM9090DX 90.5089.50

PM90100DX 100.5099.50

PM9560DX95 100

60.5059.50 95.000

94.946100.035100.000

95.26795.100PM95100DX 100.50

99.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

37

10Standard Products

PM10050DX

100 105

2.4502.384

50.5049.50

h8

100.00099.946

H7

105.035105.000

100.267100.100

0.3210.100

9.5

PM10060DX 60.5059.50

PM10080DX 80.5079.50

PM10095DX 95.5094.50

PM100115DX 115.50114.50

PM10560DX

105 110

60.5059.50

105.000104.946

110.035110.000

105.267105.100PM105110DX 110.50

109.50

PM105115DX 115.50114.50

PM11060DX

110 115

60.5059.50

110.000109.946

115.035115.000

110.267105.100PM110110DX 110.50

109.50

PM110115DX 115.50114.50

PM11550DX115 120

50.5049.50 115.000

114.946120.035120.000

115.267115.100PM11570DX 70.50

69.95

PM12060DX

120 125

2.4352.380

60.5059.50

120.000119.946

125.040125.000

120.280120.130

0.3340.130PM120100DX 100.50

99.50

PM120110DX 110.50109.50

PM12560DX

125 130

60.5059.50

125.000124.937

130.040130.000

125.280125.130

0.3400.130

PM125100DX 100.5099.50

PM125110DX 110.50109.50

PM13050DX

130 135

50.5049.50

130.000129.937

135.040135.000

130.280130.130

No hole

PM13060DX 60.5059.50

PM13080DX 80.5079.50

PM130100DX 100.5099.50

PM13560DX135 140

60.5059.50 135.000

134.937140.040140.000

135.280135.130PM13580DX 80.50

79.50

PM14050DX

140 145

50.5049.50

140.000139.937

145.040145.000

140.280140.130

PM14060DX 60.5059.50

PM14080DX 80.5079.50

PM140100DX 100.5099.50

PM15050DX

150 155

50.5049.50

150.000149.937

155.040155.000

150.280150.130

PM15060DX 60.5059.50

PM15080DX 80.5079.50

PM150100DX 100.5099.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

38


PM16050DX

160 165

2.4352.380

50.5049.50

h8

160.000159.937

H7

165.040165.000

160.280160.130

0.3430.130

No hole

PM16060DX 60.5059.50

PM16080DX 80.5079.50

PM160100DX 100.5099.50

PM17050DX

170 175

50.5049.50

170.000169.937

175.040175.000

170.280170.130

PM17060DX 60.5059.50

PM17080DX 80.5079.50

PM170100DX 100.5099.50

PM18050DX

180 185

50.5049.50

180.000179.937

185.046185.000

180.286180.130

0.3490.130

PM18060DX 60.5059.50

PM18080DX 80.5079.50

PM180100DX 100.5099.50

PM19050DX

190 195

50.5049.50

190.000189.928

195.046195.000

190.286190.130

0.3580.130

PM19060DX 60.5059.50

PM19080DX 80.5079.50

PM190100DX 100.5099.50

PM190120DX 120.5019.50

PM20050DX

200 205

50.5049.50

200.000199.928

205.046205.000

200.286200.130

PM20060DX 60.5059.50

PM20080DX 80.5079.50

PM200100DX 100.5099.50

PM200120DX 120.50119.50

PM22050DX

220 225

50.5049.50

220.000219.928

225.046225.000

220.286220.130

PM22060DX 60.5059.50

PM22080DX 80.5079.50

PM220100DX 100.5099.50

PM220120DX 120.50119.50

PM24050DX

240 245

50.5049.50

240.000239.928

245.046245.000

240.286240.130

PM24060DX 60.5059.50

PM24080DX 80.5079.50

PM240100DX 100.5099.50

PM240120DX 120.50119.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

39

10Standard Products

PM25050DX

250 255

2.4352.380

50.5049.50

h8

250.000249.928

H7

255.052255.000

250.292250.130

0.3640.130

No hole

PM25060DX 60.5059.50

PM25080DX 80.5079.50

PM250100DX 100.5099.50

PM250120DX 120.50119.50

PM26050DX

260 265

50.5049.50

260.000259.919

265.052265.000

260.292260.130

0.3730.130

PM26060DX 60.5059.50

PM26080DX 80.5079.50

PM260100DX 100.5099.50

PM260120DX 120.50119.50

PM28050DX

280 285

50.5049.50

280.000279.919

285.052285.000

280.292280.130

PM28060DX 60.5059.50

PM28080DX 80.5079.50

PM280100DX 100.5099.50

PM280120DX 120.50119.50

PM30050DX

300 305

50.5049.50

300.000299.919

305.052305.000

300.292300.130

PM30060DX 60.5059.50

PM30080DX 80.5079.50

PM300100DX 100.5099.50

PM300120DX 120.50119.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

40


10.2MB-DX cylindrical bushes


dL0.3

min

.

20˚ ± 8˚Co

Ci

B

s 3D

i(D

i,a)

Do

120

Z

Dimensions and tolerances follow ISO 3547 and GSP-SpecificationsDetail Z

Split

PartNo.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJm [d8]

Housing-øDH [H7]

Bush-∅ Di,a,mAss. in H7 housing

ClearanceCDm Oil hole-ø

dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

MB0808DX

8 10

1.1081.082

8.257.75

d8

7.9607.938

H7

10.01510.000

8.0158.000

0.0770.040 No holeMB0810DX 10.25

9.75

MB0812DX 12.2511.75

MB1010DX

10 12

10.259.75

9.9609.938

12.01812.000

10.01810.000

0.0800.040

3

MB1012DX 12.2511.75

4MB1015DX 15.2514.75

MB1020DX 20.2519.75

MB1210DX

12 14

10.259.75

11.95011.923

14.01814.000

12.01812.000

0.0950.050

3

MB1212DX 12.2511.75

4

MB1215DX 15.2514.75

MB1220DX 20.2519.75

MB1225DX 25.2524.75

MB1415DX

14 16

15.2514.75

13.95013.923

16.01816.000

14.01814.000MB1420DX 20.25

19.75

MB1425DX 25.2524.75

MB1510DX

15 17

10.259.75

14.95014.923

17.01817.000

15.01815.000

3

MB1512DX 12.2511.75

4MB1515DX 15.2514.75

MB1525DX 25.2524.75

Outside Co and Inside Ci chamfers

a = Chamfer Co machined or rolled at the opinion of the manufacturer

b = Ci can be a radius or a chamfer in accordance with ISO 13715

Wall thickness s3

Co (a)Ci (b)

machined rolled0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4

1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.51.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7

Wall thickness s3

Co (a)Ci (b)

machined rolled2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7

2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0

41

10Standard Products

MB1615DX

16 18

1.1081.082

15.2514.75

d8

15.95015.923

H7

18.01818.000

16.01816.000

0.0950.050

4

MB1620DX 20.2519.75

MB1625DX 25.2524.75

MB1815DX

18 20

15.2514.75

17.95017.923

20.02120.000

18.01818.000MB1820DX 20.25

19.75

MB1825DX 25.2524.75

MB2010DX

20 23

1.6081.576

10.259.75

19.93519.902

23.02123.000

20.02120.000

0.1190.065

MB2015DX 15.2514.75

MB2020DX 20.2519.75

MB2025DX 25.2524.75

MB2030DX 30.2529.75

MB2215DX

22 25

15.2514.75

21.93521.902

25.02125.000

22.02122.000

6

MB2220DX 20.2519.75

MB2225DX 25.2524.75

MB2230DX 30.2529.75

MB2415DX

24 27

15.2514.75

23.93523.902

27.02127.000

24.02124.000

MB2420DX 20.2519.75

MB2425DX 25.2524.75

MB2430DX 30.2529.75

MB2515DX

25 28

15.2514.75

24.93524.902

28.02128.000

25.02125.000

MB2520DX 20.2519.75

MB2525DX 25.2524.75

MB2530DX 30.2529.75

MB2820DX

28 32

2.1082.072

20.2519.75

27.93527.902

32.02532.000

28.02128.000MB2825DX 25.25

24.75

MB2830DX 30.2529.75

MB3020Dx

30 34

20.2519.75

30.00029.967

34.02534.000

30.02130.000MB3030DX 30.25

29.75

MB3040DX 40.2539.75

PartNo.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJm [d8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

42


MB3220DX

32 36

2.1082.072

20.2519.75

d8

31.92031.881

H7

36.02536.000

32.02532.000

0.1440.080

6

MB3230DX 30.2529.75

MB3235DX 35.2534.75

MB3240DX 40.2539.75

MB3520DX

35 39

20.2519.75

34.92034.881

39.02539.000

35.02535.000MB3530DX 30.25

29.75

MB3550DX 50.2549.75

MB3720DX 37 41 20.2519.75

36.92036.881

41.02541.000

37.02537.000

MB4020DX

40 44

20.2519.75

39.92039.881

44.02544.000

40.02540.000

8

MB4030DX 30.2529.75

MB4040DX 40.2539.75

MB4050DX 50.2549.75

MB4520DX

45 50

2.6342.588

20.2519.75

44.92044.881

50.02550.000

45.02545.000

MB4530DX 30.2529.75

MB4540DX 40.2539.75

MB4545DX 45.2544.75

MB4550DX 50.2549.75

MB5040DX50 55

40.2539.75 49.920

49.88155.03055.000

50.02550.000MB5060DX 60.25

59.75

MB5520DX

55 60

20.2519.75

54.90054.854

60.03060.000

55.03055.000

0.1760.100

MB5525DX 25.2524.75

MB5530DX 30.2529.75

MB5540DX 40.2539.75

MB5550DX 50.2549.75

MB5560DX 60.2559.75

MB6030DX

60 65

30.2529.75

59.90059.854

65.03065.000

60.03060.000

MB6040DX 40.2539.75

MB6060DX 60.2559.75

MB6070DX 70.2569.75

PartNo.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJm [d8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

43

10Standard Products

MB6540DX

65 70

2.6342.568

40.2539.75

d8

64.90064.854

H7

70.03070.000

65.03065.000

0.1760.100

8

MB6550DX 50.2549.75

MB6560DX 60.2559.75

MB6570DX 70.2569.75

MB7040DX

70 75

40.2539.75

69.90069.854

75.03075.000

70.03070.000

MB7050DX 50.2549.75

MB7065DX 65.2564.75

MB7070DX 70.2569.75

MB7080DX 80.2579.75

MB7540DX

75 80

40.2539.75

74.90074.854

80.03080.000

75.03075.000

9.5

MB7560DX 60.2559.75

MB7580DX 80.2579.75

MB8040DX

80 85

40.5039.50

79.90079.854

85.03585.000

80.03080.000

MB8060DX 60.5059.50

MB8080DX 80.5079.50

MB80100DX 100.5099.50

MB8530DX

85 90

30.5029.50

84.88084.826

90.03590.000

85.03585.000

0.2090.120

MB8540DX 40.5039.50

MB8560DX 60.5059.50

MB8580DX 80.5079.50

MB85100DX 100.5099.50

MB9040DX

90 95

40.5039.50

89.88089.826

95.03595.000

90.03590.000

MB9060DX 60.5059.50

MB9090DX 90.5089.50

MB90100DX 100.5099.50

MB9560DX95 100

60.5059.50 94.880

94.826100.035100.000

95.03595.000MB95100DX 100.50

99.50

MB10050DX

100 105

50.5049.50

99.88099.826

105.035105.000

100.035100.000

MB10060DX 60.5059.50

MB10080DX 80.5079.50

MB10095DX 95.5094.50

MB100115DX 115.50114.50

PartNo.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJm [d8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

44


MB10560DX

105 110

2.6342.568

60.5059.50

d8

104.880104.826

H7

110.035110.000

105.035105.000

0.2090.120 9.5

MB105110DX 110.50109.50

MB105115DX 115.50114.50

MB11060DX110 115

60.5059.50 109.880

109.826115.035115.000

110.035105.000MB110115DX 115.50

114.50

MB11550DX115 120

50.5049.50 114.880

114.826120.035120.000

115.035115.000MB11570DX 70.50

69.95

MB12060DX120 125

60.5059.50 119.880

119.826125.040125.000

120.035120.000MB120100DX 100.50

99.50

MB125100DX 125 130 100.5099.50

124.855124.792

130.040130.000

125.040125.000

0.2480.145

MB13050DX

130 135

2.6192.564

50.5049.50

129.855129.792

135.040135.000

130.040130.000

No hole

MB13060DX 60.5059.50

MB130100DX 100.5099.50

MB13560DX135 140

60.5059.50 134.855

134.792140.040140.000

135.040135.000MB13580DX 80.50

79.50

MB14060DX140 145

60.5059.50 139.855

139.792145.040145.000

140.040140.000MB140100DX 100.50

99.50

MB15060DX

150 155

60.5059.50

149.855149.792

155.040155.000

150.040150.000MB15080DX 80.50

79.50

MB150100DX 100.5099.50

PartNo.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJm [d8]

Housing-øDH [H7]



dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

45

10Standard Products

10.3DX Thrust Washers


dP

Di

Do

sT

Ha

Do

d p

dD

Hd

[D10

]

DJ

Part No.

Inside-øDi

Outside-øDo

ThicknesssT

Dowel hole Recess depthHaø dD PCD-ø dp

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

WC08DX 10.2510.00

20.0019.75

1.581.49

No hole No hole

1.200.95

WC10DX 12.2512.00

24.0023.75

1.8751.625

18.1217.88

WC12DX 14.2514.00

26.0025.75

2.3752.125

20.1219.88

WC14DX 16.2516.00

30.0029.75

22.1221.88

WC16DX 18.2518.00

32.0031.75

25.1224.88

WC18DX 20.2520.00

36.0035.75

3.3753.125

28.1227.88

WC20DX 22.2522.00

38.0037.75

30.1229.88

WC22DX 24.2524.00

42.0041.75

33.1232.88

WC24DX 26.2526.00

44.0043.75

35.1234.88

WC25DX 28.2528.00

48.0047.75

4.3754.125

38.1237.88

WC30DX 32.2532.00

54.0053.75

43.1242.88

WC35DX 38.2538.00

62.0061.75

50.1249.88

WC40DX 42.2542.00

66.0065.75

54.1253.88

WC45DX 48.2548.00

74.0073.75

2.602.51

61.1260.88

1.701.45WC50DX 52.25

52.0078.0077.75

65.1264.88

WC60DX 62.2562.00

90.0089.75

76.1275.88

46


10.4DX cylindrical bushes - Inch sizes

All dimensions in inch

(Di,a

/ D

i,am

)

dL

0.01

2 m

in.

B

DoDi

s 3

0.015

20°± 8°

Z

120

25°-50°

0.0050.030

Detail Z

Split

Part No.

NominalDiameter

Housing-ø DH

[BS 1916 H7]

As supplied Machined in situ

Oil hole-ø

dL

WallThickness

s3

WidthB

Shaft-ø DJ

Bush-ø Di,a

Ass. in an H7

housing

ClearanceCD

Shaft-øDJm

[BS 1916 d8]

Bush-ø Di,am Machined in

situ to BS 1916 H7

Clearance CDm

Di Domax.min.

max.min.

max.min.

max. min.

max.min.

max.min.

max.min.

max.min.

max.min.

06DX06

3/815/32

0.46940.4687

0.05100.0500

0.3850.365

0.36480.3639

0.36940.3667

0.00550.0019

0.37340.3725

0.37560.3750

0.00310.0016

No hole

06DX08 0.5100.490

5/32

06DX12 0.7600.740

07DX08 7/16

17/320.53190.5312

0.5100.490 0.4273

0.42630.43190.4292

0.00560.0019

0.43550.4345

0.43820.4375

0.00370.0020

07DX12 0.7600.740

08DX06

1/219/32

0.59440.5937

0.3850.365

0.48970.4887

0.49440.4917

0.00570.0020

0.49800.4970

0.50070.5000

08DX08 0.5100.490

08DX10 0.6350.615

08DX14 0.8850.865

09DX08 9/16

21/320.65690.6562

0.5100.490 0.5522

0.55120.55690.5542

0.56050.5595

0.56320.562509DX12 0.760

0.740

10DX08

5/823/32

0.71950.7187

0.5100.490

0.61460.6136

0.61950.6167

0.00590.0021

0.62300.6220

0.62570.6250

10DX10 0.6350.615

10DX12 0.7600.740

10DX14 0.8850.865

11DX14 11/1625/32

0.78200.7812

0.8850.865

0.67700.6760

0.68200.6792

0.00600.0022

0.68550.6845

0.68820.6875

12DX08

3/47/8

0.87580.8750

0.06690.0657

0.5100.490

0.73900.7378

0.74440.7412

0.00660.0022

0.74750.7463

0.75080.7500

0.00450.002512DX12 0.760

0.740

12DX16 1.0100.990

47

10Standard Products

14DX12

7/8 1 1.00081.0000

0.06690.0657

0.7600.740

0.86390.8627

0.86940.8662

0.00670.0023

0.87250.8713

0.87580.8750

0.00450.0025

1/4

14DX14 0.8850.865

14DX16 1.0100.990

16DX12

1 11/81.1258 1.1250

0.7600.740

0.98880.9876

0.99440.9912

0.00680.0024

0.99750.9963

1.00081.000016DX16 1.010

0.990

16DX24 1.5101.490

18DX1211/8

19/321.28221.2812

0.08240.0810

0.7600.740 1.1138

1.11261.12021.1164

0.00760.0026

1.12251.1213

1.12581.250018DX16 1.010

0.990

20DX12

11/4 113/321.40721.4062

0.7600.740

1.23871.2371

1.24521.2414

0.00810.0027

1.24701.2454

1.25101.2500

0.00560.0030

20DX16 1.0100.990

20DX20 1.2601.240

20DX28 1.7601.740

22DX16

13/8 117/321.53221.5312

1.0100.990

1.36351.3619

1.37021.3664

0.00830.0029

1.37201.3704

1.37601.375022DX22 1.385

0.365

22DX28 1.7601.740

24DX16

11/2 121/321.65721.6562

1.0100.990

1.48841.4868

1.49521.4914

0.00840.0030

1.49701.4954

1.50101.5000

5/16

24DX20 1.2601.240

24DX24 1.5101.490

24DX32 2.0101.990

26DX1615/8 125/32

1.78221.7812

1.0100.990 1.6133

1.61171.62021.6164

0.00850.0031

1.62201.6204

1.62601.625026DX24 1.510

1.490

28DX16

13/4 115/161.93851.9375

0.09800.0962

1.0100.990

1.73831.7367

1.74611.7415

0.00940.0032

1.74701.7454

1.75101.7500

28DX24 1.5101.490

28DX28 1.7601.740

28DX32 2.0101.990

30DX16

17/8 21/162.06372.0625

1.5101.490

1.86321.8616

1.87131.8665

0.00970.0033

1.87201.8704

1.87601.875030DX30 1.885

1.865

30DX36 2.2602.240

32DX16

2 23/162.18872.1875

1.0100.990

1.98811.9863

1.99631.9915

0.01000.0034

1.99601.9942

2.00122.0000

0.00700.0040

32DX24 1.5101.490

32DX32 2.0101.990

32DX40 2.5102.490

Part No.

NominalDiameter

Housing-ø DH

[BS 1916 H7]


Oil hole-ø

dL

WallThickness

s3

WidthB

Shaft-ø DJ

Bush-ø Di,a

Ass. in an H7

housing

ClearanceCD

Shaft-øDJm

[BS 1916 d8]


situ to BS 1916 H7

Clearance CDm

Di Domax.min.

max.min.

max.min.

max. min.

max.min.

max.min.

max.min.

max.min.

max.min.

48


36DX32

21/4 27/162.43872.4375

0.09800.0962

2.0101.990

2.23782.2360

2.24632.2415

0.01030.0037

2.24602.2442

2.25122.2500

0.00700.0040

5/16

36DX36 2.2602.240

36DX40 2.5102.490

40DX3221/2 211/16

2.68872.6875

2.0101.990 2.4875

2.48572.49632.4915

0.01060.0040

2.49602.4942

2.50122.500040DX40 2.510

2.490

44DX32

23/4 215/162.93872.9375

0.09910.0965

2.0101.990

2.73512.7333

2.74572.7393

0.01240.0042

2.74602.7442

2.75122.7500

44DX40 2.5102.490

44DX48 3.010 2.990

44DX56 3.510 3.490

48DX32

3 33/163.18893.1875

2.0101.990

2.98492.9831

2.99592.9893

0.01280.0044

2.99602.9942

3.00123.0000

3/8

48DX48 3.0102.990

48DX60 3.7603.740

56DX40

31/2 311/163.68893.6875

2.5102.490

3.48443.4822

3.49593.4893

0.01370.0049

3.49503.4928

3.50143.5000

0.00860.0050

56DX48 3.0102.990

56DX60 3.7603.740

64DX48

4 43/164.18894.1875

3.0102.990

3.98393.9817

3.99593.9893

0.01420.0054

3.99503.9928

4.00144.000064DX60 3.760

3.740

64DX76 4.7604.740

Part No.

NominalDiameter

Housing-ø DH

[BS 1916 H7]


Oil hole-ø

dL

WallThickness

s3

WidthB

Shaft-ø DJ

Bush-ø Di,a

Ass. in an H7

housing

ClearanceCD

Shaft-øDJm

[BS 1916 d8]


situ to BS 1916 H7

Clearance CDm

Di Domax.min.

max.min.

max.min.

max. min.

max.min.

max.min.

max.min.

max.min.

max.min.

49

10Standard Products

10.5DX Thrust Washers - Inch sizes

All dimensions in inch

dP

Di

Do

sT

Ha

Do

d p

dD

Hd

[D10

]

DJ

Part No.

Inside-øDi

Outside-øDo

ThicknesssT

Dowel hole Recess depthHaø dD PCD-ø dP

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

DX06 0.51000.5000

0.87500.8650

0.06600.0625

0.07700.0670

0.69200.6820

0.0500.040

DX07 0.57200.5620

1.00000.9900

0.78600.7760

DX08 0.63500.6250

1.12501.1150

0.10900.0990

0.88000.8700

DX09 0.69700.6870

1.18701.1770

0.94200.9320

DX10 0.76000.7500

1.25001.2400

1.00500.9950

DX11 0.82200.8120

1.37501.3650

1.09901.0890

DX12 0.88500.8750

1.50001.4900 0.1400

0.1300

1.19201.1820

DX14 1.01001.0000

1.75001.7400

1.38001.3700

DX16 1.13501.1250

2.00001.9900

0.17100.1610

1.56701.5570

DX18 1.26001.2500

2.12502.1150

1.69201.6820

DX20 1.38501.3750

2.25002.2400

1.81701.8070

DX22 1.51001.5000

2.50002.4900

0.20200.1920

2.00501.9950

DX24 1.63501.6250

2.62502.6150

2.13002.1200

DX26 1.76001.7500

2.75002.7400

2.25502.2450

DX28 2.01002.0000

3.00002.9900

0.09700.0935

2.50502.4950

0.0800.070DX30 2.1350

2.12503.12503.1150

2.63002.6200

DX32 2.26002.2500

3.25003.2400

2.75502.7450

50


10.6DX Strip


10.7DX Strip - Inch sizesDX Strip Inch sizes are available as Non-Standard products on request.

ss

Wu

min

L

W

Part No. Length L Total Width W Usable Width WU min

Thickness sS

max.min.

S10150DX

503500

160 150 1.071.03

S15190DX

200 190

1.561.52

S20190DX 2.052.01

S25190DX 2.572.53

©2008 GGB. All rights reserved.www.ggbearings.com

This handbook was designed by Profidoc Silvia Freitag

www.profidoc.de

02-08

GGB warrants that products described in this brochure are free from defects in workmanship and material but unless expressly agreed in wri-ting GGB gives no warranty that these products are suitable for any par-ticular purpose of for use under any specific conditions notwithstanding that such purpose would appear to be covered by this publication. GGB accepts no liability for any loss, damage, or expense whatsoever arising directly or indirectly from use of its products. All business undertaken by GGB is subject to its standard Conditions of Sale, copies of which are available upon request. GGB products are subject to continual develop-ment and GGB reserves the right to make changes in the specification and design of its products without prior notice.

GGBTM is a trademark of GGB.

DX® is a trademark of GGB.

DSTM is a trademark of GGB.

Declaration on the RoHS Directive

On July the 1st 2006 the EU directive 2002/95/EG (“RoHS-directive,Restriction of Hazardous Substances”) became effective. It forbids to place products into circulation that contain lead, cadmium, chrome (VI), mercury or PBB/PBDE containing flame retardants.All products of GGB except DU and DUB comply with the EU directives 2002/96/EG (End of life directive on electric and electronic devices) and 2002/95/EG (Constraint of certain hazardous materials in electric and electronic devices) and End of Life Vehicles directive (2000/53/EC) on the elimination of hazardous materials in the construction of passenger cars and light trucks.

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