ANSI B16.9 covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made butt-welding fittings in sizes NPS 1/2 through 48 (DN 15 through 1200). Carbon Steel Caps / according to ASME B16.9 Material: ASTM A106 or ASTM A234 / WPB Enc caps - ANSI B 16.9 dimension(mm) inches mm Height D E 1/2 15 21,34