API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Petroleum and natural gas industries-Steel pipes for us casing or tubing for wells.
Size: 2" ~ 4 1/2"(Tubing). 4 1/2"~ 13 3/8"(Casing Pipe).
Material: H40, J55, K55, N80, M65, L80, C90, T95, P110.
Type: PSL1, PSL2. Thread Type: BTC, STC, LTC, NU, EU. Length: R1/R2/R3.