... ,N80,L80,P110, Thread:STC,LTC,BTC Standard:API 5ct Size:4-1/2--20" Wall Thickness:5. ... Petroleum Machinery Co.,Ltd professionally produces all kinds of casing pipes.Material:J55,K55,N80,L80,P110Thread:STC,LTC ... ,BTCStandard:API 5ct ISO9001Size:4 1/2”-20”Wall Thickness:5 ... .21-16.13mmCertificate:API 5CT,ISO9001Length:R1 R2 R3 Grade: J55.K55.N80 ...