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Unread 10-08-2015, 03:30 PM   #1
jclaudii
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a36 square tube or avoid?

It seems in my area a36 is the norm and a500 or anything with a 10 in the beg is very hard to find. I have a few more shops to call around on as I only need a couple of feet for some Upper Control Arms.

My thoughts are could I just go a bit thicker with the a36 instead of .120 go to 3/16 which is what, .1875 in 1.5 ID? Will this make up for hte strength difference or is it still crap?

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Unread 10-08-2015, 09:55 PM   #2
jason m
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I run .120 wall 1.5" uppers, have been for 10 years and no issues.

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Unread 10-09-2015, 08:13 AM   #3
jclaudii
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But do you know what grade it is?

I know all steel is not created equal and with a family in the heep I can't take huge risks. From what I have read the a36 will bend easier than the a500/513 or 10 whatever DOM. For uppers I would not think this would be a big deal since once would be able to put a straight edge on it and verify if alignment was off for some reason.

is the square tube stronger, perhaps resist bending more, if mounted as a diamond versus a square to the CA mount buckets? Or does it not make a difference?
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Unread 10-09-2015, 09:43 PM   #4
TechJeeper
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A36 is rated to a minimum of 36,000 KSI(pretty sure it's KSI) and the 500/513 is 50,000 KSI

The A36 often goes well over 36,000KSI. You can ask for the MTR and see what the tensile strength is listed on it when you buy. 36,000 is plenty.
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Unread 10-10-2015, 08:44 PM   #5
jason m
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Quote:
Originally Posted by jclaudii View Post
But do you know what grade it is?

I know all steel is not created equal and with a family in the heep I can't take huge risks. From what I have read the a36 will bend easier than the a500/513 or 10 whatever DOM. For uppers I would not think this would be a big deal since once would be able to put a straight edge on it and verify if alignment was off for some reason.

is the square tube stronger, perhaps resist bending more, if mounted as a diamond versus a square to the CA mount buckets? Or does it not make a difference?
1020 DOM, and there uppers don't put much thought into it. Run something some what beefey and they will be fine. They don't bounce or drag on rocks so no side force is applied.

Jason.
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1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.

And on the 8th day, God created the 14 bolt....
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Unread 10-11-2015, 05:50 PM   #6
TimV
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1.5" x 1/8" square tubing is plenty strong for uppers. I made the ones on my jeep out of it, and they were fine. I did bend the one, but it was because the mount came off the diff housing during race conditions. The arm then fell down and smashed into many rocks head on. Eventually it snapped the 1 1/4" johnny joint and fell out of the jeep. I chose to make a new arm, but I probably could have reused it in a pinch. It was only bent about 10 degrees.
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