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Wall Thickness Tolerance <br /> Permissible variation in wall thickness is plus .011"minus .008". <br /> Convexity and Concavity <br /> Measured in the center of the flat side tolerance is plus or minus .010" applied to the <br /> specific size determined at the comer. <br /> Squareness, of Sides and Twist <br /> Normal Outside <br /> Permissible Squareness Twist <br /> Dimensions Tolerance in 3' length <br /> 2"x 2" Plus or minus.012" .062" <br /> Note: A square tube may have its sides failing to be 90 degrees to each other by the <br /> tolerance listed above. <br /> I <br /> j <br /> Straight Tolerance j <br /> Permissible variation in the straightness is one-sixteenth of an inch in three feet. <br /> I <br /> i <br /> Corner Radii <br /> Standard outside comer radius shall be five thirty-seconds of an inch plus or <br /> minus one sixty-fourth of an inch. <br /> Welding Flash <br /> Welding flash on the inside corner of the welded square and rectangular tubes <br /> shall be controlled to permit a nine sixty-fourths inch radius gauge to be placed in the <br /> corner. <br /> I. Finish <br /> Square: and rectangular tubes shall be manufactured from hot dipped <br /> galvanized steel with 1.40 ounces of zinc coating, conforming to ASTM A-653, also <br /> referred to as G-140. <br /> Corner weld should be zinc coated after scarfing operation. Interior and exterior <br /> walls of the tubing shall be galvanized, or tubing shall be given a triple coated <br /> I <br /> I <br /> i <br />