Tianjin Aokai Oil Tools Co Ltd You are welcomed to wholesale or buy customized seamless casing in stock and get seamless casing free sample from us, which is one of the best seamless pipe manufacturers and suppliers. Seamless casing for oil casing and tubing application for onshore and offshore Oil & Gas applications in the domains of Exploration, Production and Processing. Standard: API SPEC 5CT Standard of American Petroleum Institute Application: Seamless steel tubes for oil casing and tubing in oil wells Products name：API 5CT Casing Features: 1)Sizes: OD 4-1/2"~20" 2)Grade: H40, J55, K55, N80, M65, L80, C90, C95, T95, P110, Q125 3)Length: R1, R2, R3 4)Standard: API SPEC 5CT 5)Application: serves as walls of a well Packing: bundle or bulk Casing Technical Specification （Standard API Spec 5CT） Casing Technical Specification （Standard API Spec 5CT） Size Outside Diameter Inside Diameter Grade Wall Thickness in mm in mm in mm 4-1/2 4.500 114.30 4.000 101.60 J55K55N80 0.250 6.35 3.920 99.57 J55K55N80 0.290 7.37 5 5.000 127.00 4.408 111.96 J55K55N80 0.296 7.52 4.276 108.61 N80P110 0.362 9.29 4.126 104.80 N80P110 0.437 11.10 5-1/2