General
Fittings are manufactured by cold forming steel in punch press
dies and conform to those tolerances listed in section 5.3 of Metal
Framing Standards Publication No. MFMA-4.
Material
Steel used for fittings is Hot-Rolled Pickled and Oiled strip steel or
bar conforming to ASTM A 570 or ASTM A575. The bar steel used in manufacture
of channel nuts conforms to ASTM A575 or ASTM A576.
Welding
Fittings having two or more component parts may be arc or
resistance welded in accordance with the appropriate American
Welding Society Standards.