... Grade: J55,K55,N80,L80,P110 2.Thread:BTC, LTC,STC 3.Standard: API 5CT, ISO 4.Place of ... Length: R1, R2, R3------------------------------------------------------------------------------------------------------------------------Specification API Oil pipe, Casing ... of oil casing, tubing, casing coupling, pup joint, reducer union, drill pipe coupling and also can process the special specification ...