Heimed Radius Arm Pivot Bolt Sizing? - Ford Bronco Forum
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post #1 of 8 (permalink) Old 02-13-2017, 06:52 PM Thread Starter
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Heimed Radius Arm Pivot Bolt Sizing?

If I was going to do a heim-style radius arm pivot for my TTB, what diameter bolt should I use for the frame bracket pivot point? In other words, what size bolt would provide sufficient shear strength for RA-to-frame bracket mounting?

Is a grade 8, 9/16" bolt large enough, or, would I want something more like 5/8" diameter?

Thanks,
Eric
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post #2 of 8 (permalink) Old 02-13-2017, 10:27 PM
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The smallest I would do 3/4". My track bar heim bolts are 3/4" and my radius arm heim bolts are 1".
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96 EB Bronco- Efi odII MAF 460, D60, 10.25, detroit lockers, 4.88s, 38 toyos, deaver springs, psc steering.
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post #3 of 8 (permalink) Old 02-13-2017, 10:43 PM Thread Starter
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What about, like, an F-911 5/8" bolt? I kinda feel the plate steel bracket would tear way before that thing shears.

Whatever I use, it has to be 9/16" or 5/8". If that small of a bolt is, flat out, a no-go, then I'm going to have to change plans.

Eric
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post #4 of 8 (permalink) Old 02-14-2017, 03:21 AM
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Ruff Stuff Specialties sells a 1.25" heims with their 3 link kit but with the misalignment spacers so you can use a 9/16" or 5/8" bolt to attach it to the bracket. I guess the real question is how heavy duty do you want you mount?
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post #5 of 8 (permalink) Old 02-14-2017, 08:37 AM
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Ive used 5/8 with big trail gear johnny joints. Have held up fine even when i smashed down on one and bent my frame
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post #6 of 8 (permalink) Old 02-14-2017, 06:33 PM Thread Starter
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Quote:
Originally Posted by Green Turd View Post
Ruff Stuff Specialties sells a 1.25" heims with their 3 link kit but with the misalignment spacers so you can use a 9/16" or 5/8" bolt to attach it to the bracket. I guess the real question is how heavy duty do you want you mount?
Well, I'm simply re-doing the stock RA's, but, out of tube and with an off-set to clear my tires. I don't need extended RA's for what I do, but, I am looking for a little more vertical suspension cycling without the binding you get with stock bushings. Hence, the heim-type pivot.

The truck sees about 80% street, 20% medium trail stuff. Just want to make sure the thing will take an, accidental, shock, if it ever happens, and not shear the bolt (smacking a rock with a tire going down a dirt road at 20 mph).

Quote:
Originally Posted by Elliott000 View Post
Ive used 5/8 with big trail gear johnny joints. Have held up fine even when i smashed down on one and bent my frame
What part were you using the johnny joints on when that happened? Was it the steering linkage, or, the RA's?

Thanks guys,
Eric
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post #7 of 8 (permalink) Old 02-15-2017, 06:31 PM
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It was at the frame end of the radius arm. My steering is all heims
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post #8 of 8 (permalink) Old 02-15-2017, 09:42 PM Thread Starter
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Quote:
Originally Posted by Elliott000 View Post
It was at the frame end of the radius arm. My steering is all heims
Awesome! A testament to the durability of the 5/8" hardware. Thank you sir.

Eric
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