Stainless Steel Tongue and Groove Flange: ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L Duplex & Super Duplex Steel Groove and Tongue Flange : ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61 &more...