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Recovery Hook in Hitch with Grade 8 Bolt?

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Old Oct 18, 2007 | 04:11 PM
  #1  
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From: wisconsin
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
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Old Oct 18, 2007 | 04:43 PM
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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
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Old Oct 18, 2007 | 04:50 PM
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From: wisconsin
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...
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Old Oct 18, 2007 | 04:55 PM
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lil more but WAY worth it... http://www.4wheelers.com/warn-receiv...vis-p-997.html
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Old Oct 18, 2007 | 05:02 PM
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I actually just shove the eye of the snatch strap into the receiver, then put a hitch pin through. Worked so far.
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Old Oct 18, 2007 | 05:40 PM
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Originally Posted by unitofstuff
I actually just shove the eye of the snatch strap into the receiver, then put a hitch pin through. Worked so far.
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...
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Old Oct 18, 2007 | 05:52 PM
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From: wisconsin
Originally Posted by Tofer
Thats exactly what i wanted but i didnt want to spend the money when i dont really have any to spend in the first place.


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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Old Oct 18, 2007 | 06:41 PM
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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.
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Old Oct 18, 2007 | 08:45 PM
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it will work fine, you wont shear that, and if it starts to wear out, it's cheap to replace
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Old Oct 18, 2007 | 08:49 PM
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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.

Last edited by 4Crawler; Oct 18, 2007 at 09:41 PM.
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Old Oct 18, 2007 | 09:15 PM
  #11  
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From: Longmont, CO
Originally Posted by GSGALLANT
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 man speaks the truth. Note that this can be a life-death decision. Do you really want to be hanging on the edge of a trail and not know for an ABSOLUTE fact that your atttachment will hold?

Originally Posted by unitofstuff
I actually just shove the eye of the snatch strap into the receiver, then put a hitch pin through. Worked so far.
Originally Posted by d0ubledown
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...
Note that a GRD8 bolt is considerably stronger than a hitch pin. I think this method is somewhere in between a true shear (like the tight fitting receiver inserts) and a bending moment (like using the hook). If you're going to use the strap in the receiver hole method, spend the couple bucks and get a 5/8" grade 8 bolt ...
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Old Oct 19, 2007 | 06:16 AM
  #12  
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From: wisconsin
Thanks for all the information guys, i will use a 5/8 grade 9 bolt.
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