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recovery hook

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Re: recovery hook

Postby marakasmalan » 08 Feb 2013 11:01

Peter,

Can you perhaps do the calculation and determine the yeald strength of 4.8 4 x 10mm bolts and show us your result. Mine is quite high (even at 40Nm torque applied), and if you have four bolts you must multiply by 4. Now, I would prefer the recovery hook flying rather than the complete rear end of the Patrol.

Remember not to overtighten the bolts, Maybe Peter is the guy to advise what torque to apply, as the applied torque results in stresses in the bolt, reducing both shear and tensile capacity. Fine or coarse pitch thread will also play a small role.

Regards
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Re: recovery hook

Postby Peter Connan » 08 Feb 2013 15:42

Four M10 Grade 4.8 bolts have a combined yield load of around 7.2 Tons.

This is before any tightening torque has been applied, and as Marnus points out, the tightening load effects how much strength is left for recovery. It is however very difficult to determine the tensile load induced in a bolt due to tightening, because there are a huge number of variables that have a large effect on this, such as the type of lubrication used, the condition of the threads, what washers are used and the surface finish of the mating faces. However the best in my opinion is to use locktite and tighten bolts that are loaded in tension as little as possible. Note that bolts used in shear are a whole different matter, because the shear strength of the hook is affected by the bolt torque...

getting back to the rear hook with it's four M10 bolts, I don't believe 7.2 Tons is enough for snatch recoveries. I believe you need at least grade 8.8 bolts there, because you definately want the rope to be the weakest link in the chain.

And don't be worried about pulling the hook out of the chassis, that's going to take around 30tons of force.
Mag ons ons kenniskry met lekkerkry aanhoukry.
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Re: recovery hook

Postby jonathan » 05 Oct 2016 14:53

Dagse almal

Ek wil graag vir my die recovery punt by die agterste bumper op sit. Ongelukkig het G-Man nie voorraad nie, en is ook nie seker wanneer hy weer sal he nie. Ek kan die Nissan een kry vir so R600, maar ek is nie seker hoe betroubaar hy is nie? Kan ek hom maar koop of het iemand dalk 'n ander voorstel?

Dankie!
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Re: recovery hook

Postby SJC » 05 Oct 2016 15:08

Ek sien 4x4 direct sin is ook oor die R600.. Hu lyk sterker as nissan sin?

http://www.4x4direct.co.za/recovery-gea ... acket.html
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Re: recovery hook

Postby jonathan » 05 Oct 2016 15:11

SJC wrote:Ek sien 4x4 direct sin is ook oor die R600.. Hu lyk sterker as nissan sin?

http://www.4x4direct.co.za/recovery-gea ... acket.html


Ek het hom ook gesien, maar die gate line nie op nie as ek reg onthou
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Re: recovery hook

Postby iandvl » 05 Oct 2016 15:18

Hoor dalk by Tinus. Ek dink hy het 'n paar laat maak. Hulle lyk so:

hook1.jpg
hook1.jpg (93.03 KiB) Viewed 467 times

hook2.jpg
hook2.jpg (70.68 KiB) Viewed 467 times
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Re: recovery hook

Postby Tinus lotz » 05 Oct 2016 15:31

Ja ek het hulle is 200 elk
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Re: recovery hook

Postby jonathan » 05 Oct 2016 15:37

Tinus lotz wrote:Ja ek het hulle is 200 elk


Mooi man uitstekend! Sal een vat asb. Sal met jou organize :thumbup:
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Re: recovery hook

Postby Tinus lotz » 05 Oct 2016 16:02

Sharp :salute:
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Re: recovery hook

Postby Jorrie » 05 Oct 2016 19:35

Tinus, hou vir my een asb!
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