Corner Radius on Rectangular Tubing?
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  1. #1
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    Default Corner Radius on Rectangular Tubing?

    I am working to design a part to fit over 1" x 2-1/2" rectangular steel tubing which hasn't arrived yet. Is there an industry standard that calls out the exterior corner radius for this size of tubing?

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    There's a bunch of variations on this theme. "Standard" rectangular tube radius will vary with wall thickness. I'm sure there's also "low-radius" square steel tube, like there is in Al.

    Can you make the inside corners of the female part sharp, so that it doesn't really matter what the radius of the male part's corners are? (That sounds dirty. It wasn't meant to.)

    Regards.

    Finegrain

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    exterior corner radius for this size of tubing?
    At least two wall thicknesses with considerable variations from one corner to the next to be expected.

    I.E., on my 3 X 6 X 3/16 wall in the shop, the exterior corner radius is about 7/16 to almost 9/16". Not necessarily uniform radii, either.

    John Oder

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    Lots of box in this country is supplied to a std set of ratios, well pritty near any rate. 1 corner is oftern diffrent to the other 3 though, but this is generaly only on 3" Square and 1/4" Thick upwards. The smaller stuffs held pritty good

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    I asked this myself a while back on another forum. the answer was 2-3 times wall thickness.

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    Like Mr. Oder says, the standards (or at least the end product) are pretty loose. I have noticed a lot of variation from one stick to the next in the same bundle.

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    One area where you will find the tubing makers do not vary a lot is in wall thickness. The standard allow for something like a +/-10% variation from the stated thickness and you can be sure they will all be right at 10% below. For example, go measure some 5/16 wall tube and it usually is right around .031 shy of .312.

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    Thanks to everyone for there prompt answers! Makes me feel better that I couldn't find a standard.

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    Kelly,

    According to the U.S., AISC Steel Construction Manual, hollow sections down to 2 x 2 square & 3 x 2 rectangular tubing have a nominal outside radius of 2 x thickness.

    Regards from Melbourne,Australia,

    AAB

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    Quote Originally Posted by GregSY View Post
    One area where you will find the tubing makers do not vary a lot is in wall thickness. The standard allow for something like a +/-10% variation from the stated thickness and you can be sure they will all be right at 10% below. For example, go measure some 5/16 wall tube and it usually is right around .031 shy of .312.
    I've used a fair bit of RHS over the years, and yes all the suppliers are remarkably consistent in this area. The tube is always spot on at the lowest specified thickness.

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    Quote Originally Posted by GregSY View Post
    One area where you will find the tubing makers do not vary a lot is in wall thickness. The standard allow for something like a +/-10% variation from the stated thickness and you can be sure they will all be right at 10% below. For example, go measure some 5/16 wall tube and it usually is right around .031 shy of .312.
    I've used a fair bit of RHS over the years, and yes all the suppliers are remarkably consistent in this area. The tube is always spot on at the lowest specified thickness.


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