Mechanical/Structural Steel Square Tube | Buy Online | Cut to Size | No Minimum Order

Mechanical/Structural Steel Square Tube

Hot roll steel metal square tubing
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Please note: The "wall thickness" on mechanical steel square tubing will have a tolerance of +/- 10%.

Pricing is subject to change. In-store pricing may vary from online pricing.


Steel square tubing is an excellent candidate for most processing. Square steel tubing is available in A500 grade B or A513. Steel square tubes have a non-coated, semi-smooth grey finish. Mechanical/structural steel square tubing “wall thickness” has a tolerance of +/- 10%. Common applications include trailers, frames, shelves, and structural support. ASTM A500 is the standards specification for cold-formed welded and seamless carbon steel structural tubing in rounds and shapes. ASTM A513 is the standard specification for electric-resistance-welded carbon and alloy steel mechanical tubing.

Conversion Chart


Gauge # Size in Inches
26ga 0.0179"
24ga 0.0239"
22ga 0.0299"
20ga 0.0359"
18ga 0.0478"
16ga 0.0598"
14ga 0.0747"
13ga 0.0897"
12ga 0.1046"
11ga 0.1196"
10ga 0.1345"
5/32" 0.15625"
3/16" 0.1875"
1/4" 0.25"
5/16" 0.3125"
3/8" 0.375"
1/2" 0.5"


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