API Steel Pipe Fittings 1.Grade: J55,K55,N80,L80,P110 2.OD: ... carbon Steel Pipe Fittings ———————————————————————————————————————— Features—————————————————————————————————————————————GRADE: J55, K55, N80-1, N80-Q, L80, C90, P110We also supply premium thread products by ... , tubing, casing coupling, pup joint, reducer union, drill pipe coupling and also can process the special specification as the ...