... , K-55, N-80, L-80, P-110 Size Range:41/2"-20" OCTG PIPE(Casing & Tubing ) API 5CT : Casing pipeStandardsAPI ... 5CT, API 5B Grade J-55, K-55, N-80, L-80, P-110 ... Size Range41/2"-20" End FinishP/STC/LTC/BTC UsageUsing for Petroleum and ... -55, K-55, N-80, L-80, P-110 Size Range1.9"-41/2"End FinishP/NU/EUEUsageUsing for ...