ASTM Specs for metal strap
Metal strap used in the United States needs to adhere to ASTM D3950. The most surprising tolerance is +/-.002″ for thickness. That means that your .029″ steel strapping is likely to run .002″ thicker, or almost .031.” In fact, most manufacturers make only one thickness for 1 1/4″ x .029/.031″. The loose ASTM tolerances for …