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Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 15509 (2004): Double-pitch precision roller chains andsprockets for transmission and conveyors [PGD 31: Bolts,Nuts and Fasteners Accessories]
IS 15509:2004ISO 1275:1995
Indian Standard
DOUBLE-PITCH PRECISION ROLLER CHAINS ANDSPROCKETS FOR TRANSMISSION AND !
CONVEYORS I
ICS 21.220.30
0 61S 2004
BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
December 2004 Price Group 7
.. ....
Transmission Devices Sectional Committee, MGP 30
NATIONAL FOREWORD
This Indian Standard which is identical with ISO 1275:1995 ‘Double-pitch precision roller chains andsprockets for transmission and conveyors’ issued by the International Organization forStandardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of theTransmission Devices Sectional Committee and approval of the Medical Instruments, General andProduction Engineering Division Council.
The text of the ISO Standard has been approved as suitable for publication as an Indian Standardwithout deviations. Certain conventions are, however, not identical to those used in Indian Standards.Attention is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.
b) Comma (,) has been used as a decimal marker in the International Standard while in IndianStandards, the current practice is to use a point (.) as the decimal marker.
CROSS REFERENCES
In the adopted standard reference appears to certain International Standards for which IndianStandards also exist. The corresponding Indian Standards which are to be substituted in their placeare listed below along with their degree of equivalence for the editions indicated:
International Standard Corresponding Indian Standard Degree ofEquivalence
ISO 286-2 : 1988 ISO System of IS 919 (Part 2) :1993 ISO system of Identicallimits and fits — Part 2: Tables of limits and fits: Part 2 Tables ofstandard tolerances grades and standard tolerances grades and limitlimit deviations for holes and shafts deviations for holes and shafts (fist
revision)1s0 606 : 1994 Short pitch IS 2403 : 1991 1) Short pitch Identical withtransmission precision roller chains transmission precision roller chains 1s0606:1982and chain wheels and chain wheels (third revision)
For the purpose of deciding whether a particular requirement of this standard is complied with, thefinal value, observed or calculated, expressing the result of a test or analysis, shall be rounded off inaccordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number ofsignificant places retained in the rounded off value should be the same as that of the specified valuein this standard.
‘) Under Revision.
,’. ..
Is 15509:2004ISO 1275:1995
Indian Standard
DOUBLE-PITCH PRECISION ROLLER CHAINS ANDSPROCKETS FOR TRANSMISSION AND
CONVEYORS-
1 Scope
This International Standard specifies requirements fordouble-pitch precision roller chains suitable for themechanical transmission of power and for conveyors,together with those for their associated sprockets. Itcovers dimensions, tolerances, length measurement,proof testing and minimum tensile strengths.
These double-pitch chains have been derived fromsome of the short-pitch transmission precision rollerchains covered by ISO 606 having certain commondimensions but of double the pitch.
The chains are intended for use under less onerousconditions with respect to speed and power trans-mitted than are the base chains from which they arederived.
2 Normative references
The following standards contain provisions which,through reference in this text, constitute provisionsof this International Standard. At the time of publi-
cation, the editions indicated were valid. All standardsare subject to revision, and perties to agreementsbased on this International Standard are encouragedto investigate the possibility of applying the most re-cent edhions of the standards indicated below.Members of IEC and ISO maintain registers of cur-rently valid International Standards.
ISO 286-2:1988, ISO system of limits and fits —Part 2: Tables of standard to/erance grades and limitdeviations for holes and shafts.
ISO 606:1984, Short-pitch transmission precision ro/-Ier chains and chain wheels.
3 Transmission chains
3.1 Nomenclatureof asaamblyandcomponents
The nomenclature of the chain assembly and itscomponent parts is illustrated in figures 1 and 2; thefigures do not define the actual form of the chainplates.
Figure 1 — Chain asaambly
1
IS 15509:2004ISO 1275:1995
Rotloiler
Beoring/#
pin
Bush
m
l!- Outer plate
b) Inner link b) Outer link
c) Detachable connecting link
Ro
Bu
d) Single cranked link
~Roller
–Bush
Inner plate -/
J
L Cranked plate
Bearing pin, riveted
e) Double cranked link
NOTES
1 Thedimensions of theplates arespecified intablel.
2 Fasteners may beofvarious designs, Drawings indcate some examples.
Bearing“pin
Egure 2 — Typesof link
2
,. ...
1
IS 15509:2004ISO 1275:1995
3.2 Designation
Double-pitch transmission precision roller chains shallbe designated by the standard ISO chain numbersgiven in table 1. These chain numbers have been ob-tained by taking the ISO chain number for the basechain, given in ISO 606, and addhg the prefix 2.
EXAMPLE 1
ChainISO 1275-2(MB
3.3 Dimensions
Chains shall conform to the dimensions shown in fig-ure 3 and given in table 1. Maximum and minimumdimensions are specified to ensure interchangeabilityof links produced by different makers of chain. Theyrepresent limits for interchangeability, but are not themanufacturing tolerances.
For the purposes of this International Standard, di-mensions for the double-pitch simplex chains only areshown.
3.4 Tensile testing
3.4.1 The minimum tensile strength is that valuewhich shall be exceeded when a tensile force is ap-plied to a sample which is tested to destruction asdefined in 3.4.2. This minimum tensile strength is nota working force. It is intended primarily as acomparative figure between chains of various con-structions. For application information, the manufac-turers or their published data should be consulted.
3.4.2 A tensile force, not less than that specified intable 1, shall be applied slowly to the ends of a chainlength, containing at least five free pitches, by meansof shackles permitting free movement on both sidesof the chain centreline, in the normal plane of articu-lation.
Failure shall be considered to have occurred at thefirst point where increasing extension is no longeraccompanied by increasing force, i.e. the summit ofthe force/extension diagram.
Tests in which failures occur adjacent to the shacklesshall be disregarded.
3.4.3 The tensile test shall be considered a destruc-tive test. Even though a chain may not visibly failwhen subjected to a force equivalent to the minimumtensile strength, it will have been stressed beyond theyield point and will be unfit for service.
3.5 Proof testing
It is recommended that all chains should be prooftested by applying a tensile force equivalent to one-third of the minimum tensile strength given intable 1.
3.6 Length accuracy
Finished chains shall be measured after proof testingbut before lubricating.
The standard length for measurement shall be aminimum of
a) 610 mm for ISO chain numbers 208A to 21OB in-clusive,
b) 1220 mm for ISO chain numbers 212A to 232Binclusive,
and the chain shall terminate with an inner link at eachend.
The chain shall be suppofied throughout its entirelength, and the measuring force given in table 1 shallbe applied.
The measured length shall be the nominal lengthsubject to a tolerance of ‘:15 ‘Yo.
The length accuracy of chains which have to work inparallel shall be within the above limits but matchedby agreement with the manufacturer.
3.7 Marking
The chains shall be marked with the manufacturer’sname or trademark.
It is recommended that the chains should be markedwith the ISO chain number quoted in table 1.
.. . .
IS 15509:2004ISO 1275:1995
t-----i
i-=-l %3+-l-”–-’-12 [j
Cranked link
+--lSection of chain
The chain path depth h, IS the minimum depth of channel through which the assembled chain with small rollers will pass.
The overall width of a chain with a joint fastener is
64+ ~ for riveted pin end and fastener on one side,
b,+ 1,6t+ for headed pin end and fastener on one side;
b4 + 2 @ for fasteners on both sides.
Figure 3 — Chains
I
!
4
-.
Ro
llo
rR
olk
ar
wid
thL
sOtw
ae
nB
eari
ng
Chain
wid
thW
tih
Wid
thA
ddit
ional
Pn
atr
dia
ma
tar
dia
rrre
tar
Bush
Pla
teC
rankad
(Srn
all
lll
pin
body
path
bats
vaen
ove
rw
idth
for
Measu
ring
T.n
sila
(Iarg
e)lI
inrs
ar
bore
dapth
link2J
Ove
rd
iam
ete
rdepth
ou
ter
Lw
ari
ng
join
tfo
raa
pla
taa
inn
.rlin
kst
ren
gth
pla
tes
pin
faa
ton
.rs)
IBo
chain
pd,
d,b
44
h,k
/1b
f%b.
b
num
ber
ma
x.m
ax,
min
.m
ax.
min
.m
m.
ma
x.m
in.
ma
x.m
m.
max
.m
ax.
min
.
mm
NkN
108A
25,4
7,95
15,8
87,
853,
984
t08B
12,3
325
,412
,07
8,51
6,9
15,8
811
,18
11,3
17,
754,
4517
,848
53,
912
012
,07
11,8
113
,86,
911
,311
,43
173,
912
018
MO
A31
,75
10,1
619
,05
9,4
5,09
5,12
1583
5Z
1O
B15,09
8,4
31.7
510
,16
19,0
513
,fM
13,9
79,
6521
,84,
15,
085,
1320
014
,99
21,8
14,7
38,
413
,28
13,4
119
,64,
12K
I22
,4
!12A
38,1
11,9
122
,23
12,5
75,
885,
9818
,34
!12B
18,0
838
,19,
912
,07
22,2
317
,75
17.8
8ll,
6a5,
7226
.94,
65,
7728
031
,116
,39
16,1
39,
915
,62
15,7
522
,74,
628
029
!16A
50,8
15,6
a28,5
815,7
57,8
47,9
6500
!lB
B50,8
24,3
924,1
313
15,88
28,5
822,6
117,02
22,7
48,
2833
,58,
335,
421
,34
55,6
21,0
813
25,4
525
,58
38,1
5,4
500
60
!20A
63,5
19,0
539
,67
18,8
9,54
!206
63,5
9,56
30,4
830
,18
1619
,05
39,6
727
,46
19,6
627
,58
41,1
6,1
10,1
978
010
,24
26,6
826
,42
1666
,729
,01
28,1
443
,26,
178
095
!24A
76,2
22,2
344
,45
25,2
211
,11
11,1
4!2
4876
,225
,436
,55
36,2
18,1
44,4
525
,435
,46
35,5
950
,86,
614
,83
111
014
,68
33,7
333
,412
4,6
19,1
37,9
238
,05
53,4
6,6
1110
180
!28B
88,9
27,8
4—
30,9
915
,915
,95
!32B
37,4
610
1,6
37,0
821
,329
,21
—46
,58
46,7
165
,17,
430
,88
17,8
117
,86
1510
42,7
22r
M42
,29
24,4
45,5
745
,767
,47,
920
0025
0
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ero
llers
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etim
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ain
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ffix
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toch
ain
nu
mb
er.
UC
ran
kad
links
are
no
tre
com
men
ded
for
use
cmch
ain
sw
hic
har
ein
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ded
for
on
ero
us
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s,
3T
he
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will
dep
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on
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sed
bu
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ou
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....
IS 15509:2004ISO 1275:1995
4 Conveyor chains
4.1 General
Except where otherwise stated, the shapes, dimen-sions and test details for the chain and sprockets shallconform to clauses 3 and 5, respectively, substitutingreference to table 2 in place of table 1 where appro-priate.
It is usual for chains used for conveyor purposes tohave straight-edged (not waisted) side plates. Ad-
ditionally, an alternative large roller of diameter d, maybe adopted. These features are ,illustrated in figure 4.
4.2 Nomenclature
The nomenclature of figure 2 is also applicable toconveyor chains. Figures 2 and 4 do not define theactual form of the chain plates.
Figure 4 — Conveyorchainwith largerollers
4.3 Designation
Double-pitch precision roller chains suitable for con-veyor purposes are designated additionally with theprefix C when the straight-edged chain plates(figure 4) are used, and with a suffix L when the al-ternative large size roller (d7) k adopted. Whennecessary for the purpose of distinguishing betweenthe chain roller sizes adopted, an optional suffix S maybe applied to chains with the small roller.
4.4 Dimensions
When the large roller size is adopted, dimension d,shall be replaced by d, in wheel formulae. Dimensionsshall be in accordance with table 2.
4.5 Length accuracy
The length of plain chain shall be the nominal length‘0”5 ‘%0.subject to the tolerance o
The length of the chain with attachments shall be thenominal length subject to the tolerance ~$~~ ?10.
4.6 Marking
The chains shall be marked with the manufacturer’sname or trademark. It is recommended that thechains should be marked with the ISO chain numberquoted in table 2.
4.7 Attachments
4.7.1 General
Except when otherwise stated, the dimensions andtest details for the chain with attachments shall con-form to clause 3.
4.7.2 Designation
Two types of attachment are given, with the commondimensional basis .as given in table 3; their designationand distinguishing features are as follows:
K1: with one attachment hole centrally located ineach platform,
K2: with two attachment holes longitudinally lo-cated,
as shown in figure 5.
4.7.3 Dimensions
Attachments shall conform to the dimensions givenin table 3.
4.7.4 Manufacture
The actual form of the K attachment plates is left tothe discretion of the manufacturer, but the attach-ments are normally of integral construction, wherebythe chain plates are extended and bent over to makethe platform, as shown in figure 5.
The length of the attachment plate is also left to thediscretion of the manufacturer, but it should be suf-ficient to accommodate the attachment holeslongitudinally in the case of type K2, and not interferewith the working of the adjoining links. A commonlength is normally adopted for both types KI and K2.
4.7.5 Marking
The marking shall be the same as would be shownon the chain plates replaced by an integral con-struction attachment.
6
.. .
IS 15509:2004ISO 1275:1995
Table2 — PrinciDal dimensions. measurhw forces and tensile strenaths
I I IIEI
I 1 1.:1
I I lit.—
m
7
—. . . ., . _,____ 14
1
IS 15509:2004ISO 1275:1995
Table 3 — Dimensions of K attachment plates (see figure 5)Dimensions in millimetre
ISO chain numberl) Platform height TransversediatanseHolediametar
Longitudinal&tancabetweenhola cerrtree betweenhole centrea
k f 4 g* 0,4 * 0,5
min. * 0,2
C 208A 9,1 25,4 3,3 9,5C 208B 9,1 25,4 4,3 12,7
C 21OA 11,1 31,8 5,1 11,9C 21OB 11,1 31,8 5,1 15,9
C 212A 1487 42,9 5,1 14,3c 212A-H 14,7 42,9 5,1 14,3C 212B 14,7 38,1 6,6 19,1
C 218A 19,1 55,6 6,6 19,1C 216A-H 19,1 55,6 6,6 19,1C 216B 19,1 50,8 6,6 25,4
C 220A 23,4 66,6 8,4 23,8C 220A-H 23,4 66,6 8,4 23,8C 220B 23,4 63,5 8,4 31,8
C 224A 27,8 79,3 10,5 28,6C 224A-H 27,8 79,3
C 224B
10,5 28,627,8 76,2 10,5 36,1
C 232A-H 36,5 104,7 13,1 38,1
1) Heavy or higher-strength chains are designated with the suffix H,
.-
.
See the note=
F-H---l I-+”+-)--i–”&}-——;—l—”+—
‘J-1--l U4-I-+-J-+--W’%4-----
NOTE — K2 attachment plates each have two attachment holes, K1 plates are similar except that they have one hole, locatedcentrally (see 4.7.2).
Figure 5 — K attachment plates
IS 15509:2004ISO 1275:1995
5 Sprockets 5.2.2 Diamatral dimensions
5.1 Nomenclature 5.2.2.1 Pitch-drde diameter, d
The nomenclature for basic chain dimensions ond= p
sin 18~which all sprocket data are based is given in figure 3 z
and tables 1 and 2.Annex A gives the pitch-circle diameter for unit pitchas a function of the number of teeth.
5.2 Diametral dimensions and tooth shape
5.2.1 Nomenclature
Nomenclature for diametral dimensions and toothshape is given in figure 6.
5.2.2.2 Measuring pin diameter, ~
&=dl
5.2.2.3 Root diameter, ~
(+=d-dl
subject to the tolerance limits given in table 4.
b, =
b, =
b, =
d=
4=
4=d, =
d, =
ha =
h=
tooth side relief
tooth width
minimum width between inner plates
pitch-circle diameter
tip diameter
root diameter
absolute maximum shroud diameter
maximum roller diameter
height of tooth above pitch polygon
maximum plate depth
/
P .
r. =
‘e =
r, =
rx =
z .
Z1 =
a .
l-%
r
chordal pitch, equal to chain pitch
shroud fillet radius
tooth flank radius
roller seating radiuS
tooth side radius
number of teeth corresponding to the number of links
that can be wrapped around the sprocket
number of teeth for double-cut sprockets = 2Z
rollerseatingangle
Figure 6 — Diametral dimensions and tooth shape
9
.. ...
IS 15509:2004
ISO 1275:1995
Table 4 — Tolerance limits for root diameter
Root diameter, 4 upper Lowardeviation deviation
mm
4<127 0 0,25 mm
127<4 <250 0 0,3 mm
4>250 0 hill)
I 1) See ISO 288-2.
5.2.2.4 Measurement over pins (Seefi9ure7)
For an even rwmber of teeth:
MR = d + dR min.
For an odd number of teeth and single-cut sprockets:
&fR= d COS90”~ + dR min.
For an odd number of teeth and double-cut sprockets:
oMR=dcos~ + dfl min.
The measurement over pins of sprockets with aneven number of teeth shall be carried out over pinsinserted in opposite tooth gaps.
The measurement over pins of sprockets with an oddnumber of teeth shall be carried out over pins in thetooth gaps most nearly opposite.
The limits of tolerance for measurement over pins areidentical to those for the corresponding root diam-eters.
NOTE 1 Sprockets for double-pitch chains may be pro-vided with either one set of teeth having a number of teethequal to z or with two sets of teeth, the locationof the toothspaces of the second set being midway between those ofthe first. In this case, the total number of teeth of thewheels will be z, = 22.
In the case of a single set of teeth, z will be an integer. Inthe case of double-cut sprockets, z, will be an integer, butz will be fractional if z, is an odd number.
Short-pitchbase chains should not be used with double-cutsprockets made for extended-pitch chains and viceversa
d=
4=
4=
MR =
P=
<f? / I---J4‘vEven number of teeth Odd number of teeth
pitch-circle diameter
root diameter
measuring pin diameter
measurement over pins
chordal pitch, equal to chain pitch
Figure 7 — Measuring pin size
Single- and double-cut teethF*1 tine = zOash-dotted line= 22
10
.. ...
Is 1550s :2004ISO 1275:1995
5.2.2.5 Tip diameter
d, max. = d + 0,625p – d,
( 04
)d.min. =d+p 0,5-~ –d,
It should be noted that ~ max. and ~ min. can beapplied arbitrarily both to the minimum and maximumtooth gap forms, subject to the limitations imposedby the cutter on the maximum diameter.
To facilitate the construction of the tooth gap form toa large scale on a drawing board, the tooth heightabove the pitch polygon can be obtained from thefollowing formulae:
( )~ max. =p 0,3125 + ~ - 0,5dT
( )~ min. =p 0,25 + ~ - 0,5d1
Note that ~ max. is related to ~ max. and & min. tod, min.
5.2.3 Tooth gapform
The actual tooth gap form which is provided by cuttingor by an equivalent method shall have tooth flanks ofa form lying within the minimum and maximum flankradii and blending smoothly with the roller seatingcurve subtending the respective angles.
5.2.3.1 Minimum form
r~max. = 0,12dl(z + 2)
r{ min. = 0,505d1
5.2.3.2 Maximum form
r, min. = 0,008d1 (Z2 + 180)
q max. = 0,505d1 + 0,069 ~
~min.=12~-*
5.2.3.3 Tooth width
4 = 0,95b1: hl~)
NOTE 2 4 = 0,931q:h14 may be used by agreement be-tween user and manufacturer.
5.2.3.4 Tooth aide relief
, mm = 0,065pb
5.2.3.5 Absolute maximum shroud diameter
~=pcot J+ 1,05~ -1- 2ra mm
5.2.3.6 Tooth aide radius
‘x nom= 015P .—
5.3 Radialrun-out
Radial run-out, measured on one complete turn of thesprocket, with reference to the bore and root diame-ter, shall not exceed a total indicator reading greaterthan the larger of the two following values:
0,000 ~ + 0,08 mm, or 0,15 mm, up to a maxi-mum of 0,76 mm.
5.4 Axialrun-out (wobble)
Axial run-out, measured on one complete turn of thesprocket with reference to the bore and the flat partof the side face of the teeth, shall not exceed a totalindicator reading of
0,000 ~ + 0,08 mm, up to a maximum of1,14 mm.
For fabricated (welded) sprockets, a minimum of0,25 mm may be accepted if the above formula givessmaller values.
5.5 Pfichacouracyof sprocketteeth
Pitch accuracy of sprocket teeth is important andchain manufacturers should be consulted for details.
5.6 Preferredrangeof teeth
This International Standard primarily applies to a rangeof teeth from 5 to 75 inclusive (with interrndatenumbers of teeth 5 1/2 to 74 1/2 inclusive).
The preferred range of numbers of teeth is 7, 9, 10,11, 13, 19, 27, 38 and 57.
●) See ISO 266-2.
11
.,,
I.,,
Is 15509:2004ISO 1275:1995
5.7 Bore tolerance a) manufacturer’s name or trademark;
Unless otherwise agreed between the manufacturer b) number of teeth;and the purchaser, bore tolerances shall be H&l.
c) chain designation (the ISO chain number or
5.8 Marking manufacturer’sequivalent).
It is recommended that sprockets should be markedwith the following:
●) See ISO 288-2.
12
Is 15509:2004ISO 1275:1995
Annex A(normative)
Ptich-circlediameters
Table A. 1 gives the correct pitch-circle diameters for sprockets to suit a chain of unit pitch. The pitch-circle diam-eters for s-prockets to suit a chain of any other pitch are directly proportional to the pitch of the chain.
Table A.1 — Pfich-circlediematers
Pfich-circle Pitch-circlo Pitch-circloNumber of diameter,d, Number of
Pnch.circlediemeter,d, Number of diemetef,d, Number of
teeth for unitdiemeter,d,
teeth for unit teeth for unit teeth for unitpitchl) Pitchl) -’) ml)
z z z z
5 1,7013 23 7,3439 41 13,0635 59 la,7e92
5112 1,6496 23112 7,5026 41112 13,2225 59112 18,e4a 2
6 2 24 7,6613 42 13,3615 60 19,1073
6112 2,1519 24112 7,82 42112 13,5405 60112 19,2665
7 2,3048 25 7,9787 43 13,6885 61 19,4255
7112 2,4566 25112 8,1375 43112 13,8565 611126 2,6131 26
19,58478,2862 u 14,0176 62 19,7437
8 1/2 2,7662 267!2 a,455 44 1/2 14,1765 62112 19,8029
9 2,9238 27 8,613a 45 14,3356 53 20,0619
9712 3,079e 27 fi2 8,7726 45112 14,4846 63 1/2 20,221
10 3,2361 26 a,9314 46 14,6537 54 20,38
10112 3,3927 28 %12 9,0902 46 1/2 140a127 64112 20,5393
11 3,5494 28 9,2491 47 14,9717 65 20,69e 211 IJ2 3,7065 26112 9,408 47112 15,130a 65112 20,857512 3,8637 30 9,5666 46 15,2688 66 21,016412 IJ2 4,0211 30 f12 9,7256 46112 15,446 a 55112 21,1757
13 4,1786 31 9,68-45 48 15,6079 67 21,334613112 4,3362 31112 10,0434 48112 15,7669 57 1/2 21,493914 4,484 32 10,2023 56 15,926 66 21,652814112 4,6518 32112 10,3612 56712 16,085 56112 21,8121
15 4,8097 33 10,5201 51 16,2441 68 21,97115112 4,8677 33112 10,679 51112 16,4031 68112 22,130316 5,1258 34 10,638 52 16,5622 7016112
22,26825,264 34112 10,9869 52112 16,7212 701!2 22,4485
17 5,4422 35 11,1558 53 16,8603 7117 1/2
22,60745,6005 35112 11,3148 53112 17,0393 71112
1822,7667
5.7668 36 11,4737 54 17,1884 72 22,925618 1/2 5,9171 36112 11,8327 54112 17,3575 72112 23,0649
19 6,0755 37 11,7916 65 17,5166 7319112 6,234
23,243 a37 1/2 11,9506 65 w 17,6756 73112
2623,4031
6,3825 36 12,1086 68 17,6347 7420112 8,5509
23,58236112 12,2685 56112 17,8838 74112 23,7213
21 6,7085 38 12,4275 67 18,1529 7521 1/2 6,6681
23,8802391!2 12,5865 57 1/2
2216,3119
7,0266 40 12,7455 56 18,47122712 7,1653 40712 12,8045 58 1/2 18,6301
. .1) TtrIs IS sometimes referred to as “unit pitch-circle diameter”.
13
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,
Bureau of Indian Standards
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This Indian Standard has been developed from Doc : No. MGP 30 (0286).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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