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    A-arm material, debating on what thickness?
    #1
    Millenium Member rgvkid's Avatar
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    Im Debating on what thickness to go with for a set of Front A-arms. The buggy will weigh in at about 900lbs.
    Im building the arms with 1 1/4 DOM with 5/8 heims but Im debating on what wall thickness for the A-arms. The last front end I did had 1 1/4 Mild steel .090 but they were 4 inches shorter.
    The new Lower arm will be 20 Inches with some gusseting. I've been thinking .090 lower and .083 upper.
    Or .120 Lower and .090 upper.
    All 1 1/4 DOM.
    Main concern is weight. Although its not a big difference in weight between the 2 wall thicknesses, in the long run it all adds up.
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    Re: A-arm material, debating on what thickness?
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    Seņor Banned Member Chikin's Avatar
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    Weight might add up. But thinner wall leads to rebuilding the arms. And that's where your at now. Build it right the first time.

    What does threaded hiem bungs (6) per side. And we'll let's say the lower bends due to wall thickness (being small) and have to take a weekend to rebuy and remake them.
    Dom! Is my vote on the lower.
    Now the upper doesn't have all of the weight from the shock and well it's there to guide the spindle for the most part. See what I mean.

    This is my advice
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    Re: A-arm material, debating on what thickness?
    #3
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    .120 lower, .095 upper 24" long 1100lbs. If its truly 900 .095 lower and .083 upper. But all that is really dependent on design.
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    Re: A-arm material, debating on what thickness?
    #4
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    If your using Mild steel then .120 wall minimum. If Chromoly then you can get away with .095 however I would still use .120. Weight has a major bearing on strength however its the rocks, holes and trees you clip that will determine how well they hold up.
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    Re: A-arm material, debating on what thickness?
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    .120 wall min. regardless of the material or suspension, IMO. Not just for strength but also for protection from hitting rocks and other obstacles so your not denting the arms all the time.
    www.SinisterSandSports.com
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    Yes, i'm on facebook clicky clicky.................

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    Re: A-arm material, debating on what thickness?
    #6
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    .120 dom lower and .095 dom upper period
    Dezert Rocket Factory
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    Re: A-arm material, debating on what thickness?
    #7
    Bend-Tech Dragon Master
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    Yes. What good is super light weight if its a glass tiger?
    Anything less than dom is a waste IMO. Dom has some memory , ERW/ plain steel just bends. Test some dom vs erw in a bender, you'll find dom takes a lot more force.
    Last edited by JGSturbo; 10-30-2012 at 08:01 AM.
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    Re: A-arm material, debating on what thickness?
    #8
    Millenium Member rgvkid's Avatar
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    Okay Thanks for the input guys.

    I'll stick with .120 DOM lower and .095 DOM upper.
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    Re: A-arm material, debating on what thickness?
    #9
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    It would depend on how you design the arms, there is no one set wall thickness. My arms are 1" 4130 tubing with a wall thickness of .065, the lower arm is made with a bend like you would see on atv arms to get the correct angle. I use a 3/4" 4130 .065 tube there as a gusset. To be honest dom is crap, use the real stuff.
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    Re: A-arm material, debating on what thickness?
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    Quote Originally Posted by MC@ Performance Fab View Post
    It would depend on how you design the arms, there is no one set wall thickness. My arms are 1" 4130 tubing with a wall thickness of .065, the lower arm is made with a bend like you would see on atv arms to get the correct angle. I use a 3/4" 4130 .065 tube there as a gusset. To be honest dom is crap, use the real stuff.
    lol, too funny that people actually believe that.

    Nascar would definitely disagree with that statement, seeing how their vehicles, which hit each other and concrete walls at 200 mph and have never had a failure, specifically dictate the use of DOM and chromo is illegal.

    I have never ran chromo, I hate the stuff, and i've had customers wreck at over 80 mph with multiple flips, had customers lawn dart at 70, had customers hit trees over 60, had customers barrel roll down mountain sides and have never had a structural failure and everyone walked away, and all of that was before I used DOM, those were all ERW frames, yet i've seen more broke and cracked chromo frames than I can count over the years.
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