A500 Structural Tubing Steel
Outside diameter measurements for A500 carbon steel tube must be made at positions at least 2” (50.8mm) from either end of the tubing. For round structural tubing with nominal OD of 1.900” (48.26mm) and smaller, the outside diameter may not vary more than ±0.5%, rounded to the nearest 0.005” (0.13mm), of the specified size.
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