According to the casing pipe API 5CT,anti-corrosion deal with the body of the pipe.BTC connection increased the tensile strength SizesOD 4-1/2”~20”GradeH40, J55, K55, N80, M65, L80, C90, C95, T95, P110, Q125LengthR1, R2, R3StandardAPI SPEC 5CTApplicationServes as walls of a wellPackingBundle or bulk Casing Technical Specification (Standard API Spec 5 CT)SizeOutside DiameterInside ...