Recovery Hook in Hitch with Grade 8 Bolt?
#1
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Recovery Hook in Hitch with Grade 8 Bolt?
I am trying to figure out a way to mount this hook into my hitch.
Not this exact one but close.
If i drilled a hole through my hitch, and put a 7/16x4" bolt through the hitch and through the hook would it be strong enough? Its a 2" receiver.
Like this:
So what do you think? I could even use a grade 9
Not this exact one but close.
If i drilled a hole through my hitch, and put a 7/16x4" bolt through the hitch and through the hook would it be strong enough? Its a 2" receiver.
Like this:
So what do you think? I could even use a grade 9
#2
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if i'm reading this site right the chart near the end a 0.3750 a little heavyer than 7/16 has grade 8 bolt has about a 10,000 sheer strength so i think it would work
http://www.rockcrawler.com/techrepor...ners/index.asp
http://www.rockcrawler.com/techrepor...ners/index.asp
#3
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Good chart thanks a lot! I may just go with a grade 9 just because I have easy access to them. I would have bought a receiver with a hook already on it but i already had this hook. Im gettin ready for winter and pullin people out already...
#6
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yup..thats what i'd do. cheap, simple, it works, and you dont have something hanging out of your receiver. putting something in there to attach the strap eye to is just another component to fail...
#7
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lil more but WAY worth it... http://www.4wheelers.com/warn-receiv...vis-p-997.html
I thought about just putting the strap in the hitch and then using a pin. But this was just cooler .
Ill just get a grade 9 bolt for piece of mind.
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#8
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Actually, be careful using that chart in this case. Your bolt won't be in pure shear. There will be bending moments involved also, since your pulling force won't be right at the inside walls of the hitch (I assume that the hook you are using doesn't fit snugly in the hitch.) This is the same case as putting the end of the strap in the hitch and shoving a pin through. 99 times out of 100 it will be fine, but it's that one time that somebody is really stuck, and you decide to try to use the snatch technique that your pin will fail. Spend the $30 and buy a proper tow-ring and shackle.
#10
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iTrader: (3)
FYI, hitch pins are 5/8" diameter w/ shear strength of ~31,000 lbs:
- http://www.rv.net/forums/index.cfm/f...d/19574789.cfm
If using the smaller bolt, probably a good idea to test it out a few times and check for any bending in the bolt. Might also want to get a bolt with enough unthreaded length to pass clear through the receiver.
- http://www.rv.net/forums/index.cfm/f...d/19574789.cfm
If using the smaller bolt, probably a good idea to test it out a few times and check for any bending in the bolt. Might also want to get a bolt with enough unthreaded length to pass clear through the receiver.
Last edited by 4Crawler; 10-18-2007 at 09:41 PM.
#11
Contributing Member
Actually, be careful using that chart in this case. Your bolt won't be in pure shear. There will be bending moments involved also, since your pulling force won't be right at the inside walls of the hitch (I assume that the hook you are using doesn't fit snugly in the hitch.)
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