American Iron and Steel Institute (AISI). 1st Printing – June 2007. 30 p. This standard provides criteria, including material and product requirements for structural members and non-structural members utilized in cold-formed steel framing applications where the specified minimum base steel thickness is between 18 mils (0.0179 inches) (0.455mm) and 118 mils (0.1180 inches) (2.997mm).