1.Standard:API 5CT 2.Grade:J55,K55,N80,C90,P110,Q125 3.Oil pipe,casing pipe ,casing collar 4.Outer diameter:114.3mm-339.72mm API 5CT casing collar Grade:J55,K55,N80,C90,P110,Q125 We offer more grades according to mutual agreement . What is more,hot dip galvanizing,PE coating,FBE coating is provided. API 5CT J55 casing collar of pipe