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Discussion Starter #1
looking into re-doing the suspension on my rock racer and was interested in what people think is a safe size of bolt for lower link. A lot of people are running 1.250 heims with 1" bolts, but that bolt seems way overkill. I am considering the ballistic fab joints with the 5/8 bolt hole. I would of course be running a grade 8 bolt. How many people have broken lower link bolts of this size or bigger? This rig sees a fair amount of abuse, mostly higher speed collisions with rocks and hard link impacts. Rig weighs about 3800lbs and has 40" tires with dana 70 axles front and rear.
 

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i'd say lowers 3/4" bolt uppers 5/8" bolt
i run 5/8" grade 8 for my uppers and lowers but im a 2700 4 banger with fj80 axles.
1" bolt would be stupid overkill
 

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If you buy a good quallity 5/8" Gr8 it will be plenty.
 

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I've seen a couple broken 5/8" grade 8 link bolts, I wouldn't run anything smaller than 3/4" (but I'm one of those guys with 1" bolts :flipoff2:)
 

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I have bent [not broke] a 5/8" grade 8 bolt on a lower. Somewhat of a special case, because I have only one lower link on the rear. The joint failed and got clunky and by the time I figured out what was clunking the bolt was bent enough that I had to cut it out.

Marv
 

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i break usa made grade 8 5/8 bolts about once a month. on my upper links with a double shear. i plan to upgrade the joint to a 3/4 soon to stop this. i have 1 grade 9 that has never broke. i use 1" on my lowers.
 

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What benefit is there of using a smaller bolt besides you can get hi misalignment bushings for them. Most Suspensions do not need all of that miss alignment to work. The weight is no different it just " Looks " heavier.

The plus side is you never have to worry about them again.
 

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Discussion Starter #9
benefit with ballistic joints is the joint itself, you can either get the smaller joint with 9/16 or 5/8 bolt or jump up to the 3" joint that takes 3/4 bolt. price is the main difference, and mounting a bigger wider joint. As long as space is available, i imagine the extra price shouldn't be the decider.
 

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3/4 lower...I think we use 9/16 uppers..never busted one yet...and it gets BEAT (well..not SHANNON CAMPBELL beat....more like Tom Campbell beat)..:D
 

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<--- has broken a lot of shit, but never a 9/16" link bolt.
 

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Discussion Starter #12
I don't beat it like Shannon, but try to on occasion:flipoff2: I am always shooting to beat him though.
 

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I run 3/4" lower link bolts in 1.25x1 heims, and 1/2" upper link bolts in 3/4x5/8 heims.

We broke one 1/2" upper link bolt at KOH 08. First time this car has ever broken a link bolt. I'll probably swap it out for a higher grade bolt before KOH 09.
 

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3/4" for all of them, imo. Plenty, but not overkill.


Its great to have all nuts and bolt heads the same size too.
 

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I run 5/8's on everything. 22klbs in shear strength is a lot. Add that it is double shear and I would think that you have to really screw up your design or your driving to break one. I do run 4 links though which better distributes the forces. Never broken a 5/8s bolt. Now that they are all the same size I only need two wrenches.
 

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I wouldnt think the shear forces on the bolt under just wheeling conditions would be great enough to shear even a 9/16". I have seen guys with single or double triangulated suspensions on hard rolls shear 9/16" gr8 though. The axle took quite a bit of a side hit. Im sure the forces on the bolt in that situation are pretty high, and increase as link triangulation decreases.
 

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I have a 4k# buggy with krawlers and I have broken tons of parts, but never any of my 9/16" grade 8 bolts link bolts. I am using johnny joints. Link seperation, and proper torque, and thick tabs have alot to do with broken link bolts.

-Lucas
 

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I run 3/4 bolts on my rockwell buggy with plenty of HP :flipoff2:


No issues yet, search my name for videos if you wana see how I wheel :smokin:
 
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