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A question: What grade are the square U-bolts that you used? If they are just zinc-plated standard steel they might not be up to an impact load of a trailer tongue falling off of a ball. I couldn't see a rating at all on the packaging.
So I called the manufacturer of the U-Bolts using the number on the back of the packaging. Talked to a guy who was saying things way over my head as far as knowledge level.... he said double kneeled to be grade 5 or 8 which these are not..... this product was between grade 3 and 5 as far as strength... something about single stage tempering..... and they are zinc oxide coated.
I showed him a picture of this application (directed him to this page) and he said I should have no issues after seeing my pictures above. I jumped on these steps/hooks after installing them and it just moves the whole rear end of the truck up and down and I am not a light man at 240ish pounds. Of course this in no way simulates a 2500lb+ trailer being pulled and the initial yank from it.
If I had a wheeled trailer jack on my trailer I would like to simulate a yank and tow with the trailer loaded down to see how it does but I don't. How you guy(s) feel about it???
If it was mine, AND I was using them as trailer hooks, I would find some grade 8 stuff. Trailers coming un-hooked can cause a lot of damage to your vehicle and potentially kill someone else. All of the fault will be on you when they investigate and you weren't using proper safety chain attachment points. As the other person noted, You can take out slack by twisting the chain if needed.
If you are just going to use them for the look or for being towed out from being stuck somewhere, it probably doesn't really matter. Although me personally, I would still source grade 8.
If it was mine, AND I was using them as trailer hooks, I would find some grade 8 stuff. Trailers coming un-hooked can cause a lot of damage to your vehicle and potentially kill someone else. All of the fault will be on you when they investigate and you weren't using proper safety chain attachment points. As the other person noted, You can take out slack by twisting the chain if needed.
Grade 8 is what I was thinking also. Not just the U bolt, but anything associated with that stress path (nuts, washers, flat beackets, etc.).
Excellent article! It doesn't have a real world test with vehicles etc. but definitely gets us started from the perspective of the chain itself.
Originally Posted by jdunk54nl
If you are just going to use them for the look or for being towed out from being stuck somewhere, it probably doesn't really matter.
Agree, in this scenario, worst case is the hook and cable/strap/etc. break off and maybe fly a little.
Originally Posted by jdunk54nl
Although me personally, I would still source grade 8.
Likewise for me. The first pulls while the material is young are one thing. Later, say five or more years down the road when it has seen some use etc., it will pay for itself when it still works fine with no surprises.
The core idea is great! I'll probably do the same on a couple of my vehicles when it warms up.
If it was mine, AND I was using them as trailer hooks, I would find some grade 8 stuff. Trailers coming un-hooked can cause a lot of damage to your vehicle and potentially kill someone else. All of the fault will be on you when they investigate and you weren't using proper safety chain attachment points. As the other person noted, You can take out slack by twisting the chain if needed.
If you are just going to use them for the look or for being towed out from being stuck somewhere, it probably doesn't really matter. Although me personally, I would still source grade 8.
Well this update is years late. Shortly after the start of this thread I found a place to bend grade 8 u-bolts. If your in Texas and need this done check out in-land truck parts. They can bend 12 inch rod on the spot for you and have the nuts and washers on hand.
And I need to give a nod. I just re-linked this. Give credit where credit is due! gDMJoe thanks for the inspiration. Have used these tow hooks for years now.
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