Secondary structural framing refers to components such as purlins, girts, eave struts, wind bracing, flange bracing, base angles, clips, and various other structural elements. Purlins, girts, and eave struts are cold-formed steel members that have a minimum yield strength of 345 MPa (50,000 psi). They conform to the physical specifications of ASTM A572 (Grade 50) or ASTM A653 (Grade 50) or an equivalent standard.