OCTG pipe for oilfield API 5CT OIL CASING PIPE API 5CT Steel Pipe J55 K55 L80 N80Q C90 T95 P110 Petroleum Casing Pipe OCTG pipe 1) Grade: J55,K55,L80,N80Q,C90,T95,P110 2) Size: 4 1/2"to 20" 3) Wall thickness: 6.35-12.7mm 4) Thread type: STC, LTC, BTC,premium thread connection 5) Length R1 R2 R3 6) All our casings accord with API 5CT standard and GOST standard. 7)pak steel thread protecto