Bollhoff Helicoil Nuts 2

7/30/2019 Bollhoff Helicoil Nuts 2

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Screwlock function due to elastic locking mechanismdirect in the thread

High temperature resistance, no seize and galling Corrosion resistance Repeated assembly

No thread wear or flank damage Different technical surfaces on HELICOILand on

the nut body Graded material selection Uniform load and tension distribution Large range of sizes

HELICOIL

SCREWLOCK

in welding nuts Special design on request

HELICOILSCREWLOCKLocking Nuts

For high temperature applications

Special Nuts

HELICOILThreaded insert typeSCREWLOCK

or type Standard


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HELICOILplus SCREWLOCK

Repeated screw assembly: High temperatur resistance:

Stainless steel A2 or A4A2 1.4301 XCrNiMo1810A4 1.4571 XCrNiMoTi17122 Temperature resistance up to 425oC

INCONEL X750 NiCr15Fe7TiAl => Temperature resistance up 550...750C

Nimonic 90 NiCr20Co18Ti => Temperature resistance up to 600...900C

Applikations::Aircraft industry: Turbo engines, interiuer (passenger seats)

Housings for avionics

Locking of adjusting screws (instead of counternut): Paper feeder (Printing industrie)

High temperatur locking nuts for automotive exhaust systems


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HELICOILSCREWLOCK Locking Nuts

for Opel-Applications

Thread Size M8

GM-Nr. 09157116 Boellhoff-Nr. 0135 908 0048High temperature version

Nut body: Steel 34CrNiMo6 or 21CrMoV57galv. cupper plated

HELICOIL SCREWLOCK: Inconel X750galv. silver platedNominal Heat resistant up to 750C

Proofload: 30400N

Locking torque first on screwingin accordance to ISO2320: 3...5Nm

Used for exhaust systems, turbo charger, catalysator etc.emvironmental temperature 650C...800C High temperature resistance of locking element and complet nut

Repeated assembly after exposition to high temperatur without threaddemage on the stud neither in the nut. High corrosion resistance


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Thread Size M8

GM-Nr. 55558986 Boellhoff-Nr. 0135 908 0054Low temperature version


HELICOIL SCREWLOCK: Stainless steel 1.4301galv. silver platedNominal Heat resistant up to 425C

Proofload: 30400N

Locking torque first on screwingin accordance to ISO2320: 3...5Nm

Used for exhaust systems, turbo charger, catalysator etc.emvironmental temperature 350... 400C High temperature resistance of locking element and complet nut

Repeated assembly after exposition to high temperatur without threaddemage on the stud neither in the nut. High corrosion resistant thread element


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Thread Size M10

GM-Nr. 90570845 Boellhoff-Nr. 0135 910 0040High temperature version


HELICOIL SCREWLOCK: Inconel X750galv. silver platedNominal Heat resistant up to 750C

Proofload: 48100N

Locking torque first on screwing in accordance to ISO2320: 3...5Nm

Used for exhaust systems, turbo charger, catalysator etc.emvironmental temperature 650C...800C High temperature resistance of locking element and complet nut Repeated assembly after exposition to high temperatur without thread

demage on the stud neither in the nut. High corrosion resistant thread element


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Other Applications

Thread Size M8 with additional washer 3)

Boellhoff-Nr. 0135 908 0056High temperature version

Nut body 1): Steel 34CrNiMo6 or 21CrMoV57galv. cupper plated

HELICOIL SCREWLOCK 2): Inconel X750galv. silver platedNominal Heat resistant up to 750C

Proofload: 38100N

Locking torque first on screwing in accordance to ISO2320: 3...5Nm

Used for exhaust systems, turbo charger, catalysator etc.emvironmental temperature 650C...800C High temperature resistance of locking element and complete nut Integrated washer 3) for longer clamping length and to realise radial slipping Repeated assembly after exposition to high temperatur without thread

demage on the stud neither in the nut. High corrosion resistant thread element


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Boellhoff-Nr. 0135 908 0056High temperature versionTest results

Test procedure:Expose the nut to a temperatur of 700C for on hour.

Proof load testThe proof load test in accordance

to DIN EN 20898. Nominal proof loadfor a nut M8 class 10 = 38,1kN.

Clamping torque testTest procedure (5 screwing cycles)On screwing the nut => Locking torque for 1. on screwingTighten the nut with a prefailing torque of 28NmUn screwing the nut for 180an measure the breakaway torque for the 1. and the 5. un screwing


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Capability of HELICOIL SCREWLOCK locking element

Repeated assembly with HELICOILplus SCREWLOCK

Thread dimension HELICOILplus SCREWLOCK M4x6Screw M4x16 12.9 Zn5/C/Fe/ ISO 4762

Test conditions based on AECMA Standard EN2943.Differences to EN2943:No lubrication10 Screwing cycles with one screw.In total 5 screws

HELICOIL SCREWLOCK has to endure 50 cycles

Aim of the test:

To show that the loss of locking torque is based on wear on the screwand not by wear on the HELICOIL SCREWLOCK element

Result:

After using an HELICOIL SCREWLOCK with one screw for 10 screwing

cycles, with a new screw the locking torque was on the initial value again.(See diagram on next page).


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Test result:

Nominal values in accordance to confirmation Programmefinal validated version SNECMA-TURBOMECA-AECMA 27.Sept. 01 (Aircraft Industry)

Min. break away torque: 0,15Nm

Max. locking torque for on- and unscrewing: 1,6NmTightening torque for each cycle: 2,8Nm

Nominal values in accordance to DIN 267 T5 oder ISO2320(general industry)First on screwing: max. 0,9Nm

Break away torque 1. unscrewing: min. 0,18NmBreak away torque 5. unscrewing: min. 0,12Nm

Average:M1 = 0,71NmM10 = 0,33Nm

Min break away torque for HELICOILplus SCREWLOCK

M4x6 with 5 screws M4x16 12.9 Zn5/C/Fe ISO 4762

HELICOILplus Nr. 2

10 repeated assemblies for each screw in one HELICOIL

00,10,2

0,30,40,50,60,70,80,9

1

.unscrewin

g

2

.unscrewin

g

3

.unscrewin

g

4

.unscrewin

g

5

.unscrewin

g

6

.unscrewin

g

7

.unscrewin

g

8

.unscrewin

g

9

.unscrewin

g

10

.unscrewin

g

M

[Nm]

Screw 1

Screw 2

Srew 3

Srew 4

Screw 5

average


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Capability of HELICOIL SCREWLOCK locking elementRepeated assembly with HELICOILplus SCREWLOCK for high temperature

Thread dimension HELICOILplus SCREWLOCK UNF 5/16-24

Nominal thread size= 7,94mm; pitch=1,06mm (similar to M8x1,25)

HELICOIL SCREWLOCK made from heat resistant nickel alloy NIMONIC 90Test conditions based on SBAC TS41.5 screwing cycles with temperature of 500C for 6h (each cycle)

Documents

Bollhoff Helicoil Nuts 2