Forged carbon steel fittings conform to ASME B16.11 and ASTM A 105 for chemical and mechanical properties. Dimensions are to ASME B16.11 except 1/8" are larger than ASME specifications. For ratings purposes, 3000 psi threaded fittings compare to Schedule 160 pipe. The fittings shown here are all threaded 3000 psi series.