... 5/8", 20", 30" Grade J55, K55, N We supply all sizes and grades of casing and tubing, both Seamless and ERW ... 2 7/8", 3 1/2", 4", 4 1/2" Grade J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, ... applications Special bevel; 20° bevel Slotted (Screen casing)Flush JointMacaroni tubing 1.05”, 1.315”, 1.66”Resilient seal (SR ... ; Vacuum nitriding coating; Vacuum insulated; HDPE liner Casing and Tubing in API Spec 5CT