Oil Casing is mainly used to support the wellbore,during drilling and after well completion,ensuring drilling operations and normal production of oil wells.It serves as the lifeline for oil-well operation.

Steel Grade：H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, Q125 etc

SIZE：OD: 114.3MM—508MM(4 1/2"—20")；WT: 5.21MM-16.13MM(9.5PPF—133PPF)

Standard：API 5CT, GB, ISO11960, GOST

Thread Type：STC, LTC, BTC, XC and Premium connection

Length：R1, R2, R3

Service：NDT etc related rules of API 5CT and 5B