Hitch Pin vs. Grade 8 Bolt......Again - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 25 (permalink) Old 01-10-2009, 04:19 PM Thread Starter
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Hitch Pin vs. Grade 8 Bolt......Again

Ok.....I cant find the thread on using a grade 8 bolt instead of a hitch pin............that had some very interresting reading in it, and I wanna make a decision on what I wanna use.....

WATCHA GUYS THINK???




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post #2 of 25 (permalink) Old 01-10-2009, 04:26 PM
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If you belive that you can tighten the bolt anough to deform the receiver and clamp the ball mount just as tightly as bolting two pieces of free-moving steel togather, then the Gr-8 bolt is better.

If however, you realize that you cannot tighten the bolt enough to fully clamp the receiver to the ball mount and that a Gr-8 fastener (US spec) is prone to vibration failures, the Gr-5 hitch-pin is a better choice. They will BEND before they break.

I liken this discussion to the "Nail or Screw" debate....

Nails don't hold as tightly, pull out more easily but are easier to install/remove (hammer only).

Screws clamp MUCH more tightly, do not self-loosen but will break before they bend (in most cases).

This is why when you are building a deck, stairs etc, most codes require a "threaded fastener" to position the material and a "driven fastener" to HOLD it.

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post #3 of 25 (permalink) Old 01-10-2009, 05:59 PM
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I guess that my thinking is that a hitch pin would be better, hands down, everytime. The reason is because that is what they were designed for.

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post #4 of 25 (permalink) Old 01-10-2009, 10:34 PM
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I'm gonna vote for the hitch pin, its just easier to swap hitches if the need comes. Also, something I do know is that some ag style hitch pins are illegal for on road use but hold more weight than standard "auto" hitch pins. Go figure.

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post #5 of 25 (permalink) Old 01-12-2009, 01:18 AM
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I guess i just use a ag style hitch pin cause it what i have around and is stronger.
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post #6 of 25 (permalink) Old 01-12-2009, 11:15 AM
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Quote:
Originally Posted by John_G View Post
If you belive that you can tighten the bolt anough to deform the receiver and clamp the ball mount just as tightly as bolting two pieces of free-moving steel togather, then the Gr-8 bolt is better.

If however, you realize that you cannot tighten the bolt enough to fully clamp the receiver to the ball mount and that a Gr-8 fastener (US spec) is prone to vibration failures, the Gr-5 hitch-pin is a better choice. They will BEND before they break.

I liken this discussion to the "Nail or Screw" debate....

Nails don't hold as tightly, pull out more easily but are easier to install/remove (hammer only).

Screws clamp MUCH more tightly, do not self-loosen but will break before they bend (in most cases).

This is why when you are building a deck, stairs etc, most codes require a "threaded fastener" to position the material and a "driven fastener" to HOLD it.

Of course you can clamp the receiver to the ball mount, I know because mine's clamped and clamped good. 100-150 ft-lbs for torque will do that.

Please educate yourself before you give advice on things you know little of: http://www.pirate4x4.com/tech/billav...lts_signed.pdf

More: http://www.fastenal.com/content/docu...renceGuide.pdf
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post #7 of 25 (permalink) Old 01-12-2009, 10:34 PM
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Go with a pin. I had a grade 8 break where the threads met the shank.
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post #8 of 25 (permalink) Old 01-13-2009, 12:53 AM
 
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If it makes you feel any better, I have broken grade 12 bolts.

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post #9 of 25 (permalink) Old 01-13-2009, 02:24 PM
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I grade 8 is stronger than any hitch pin. Look at the breaking strength

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post #10 of 25 (permalink) Old 01-13-2009, 09:26 PM
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Grade 5 bolt has give to it when shockloaded. Grade 8 doesn't. Ask my two dead horses. Too each their own!!!
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