1.OD:57~533.4mm 2.Material:J55,K55,N80,L80,P110,AISI1020. 3.Product method: Rolling or Forged 4.Standard:API 5CT,5L,GB8163. Suit for coupling size as below : NUE:1.9",2-3/8",2-7/8",3-1/2",4",4-1/2" EUE:1.9",2-3/8",2-7/8",3-1/2",4",4-1/2" STC:4-1/2",5",5-1/2",6-5/8",7",7-5/8",8-5/8",9-5/8",10-3/4",11-3/4",13-3/8",16",18-5/8",20". LTC:4-1/2",5",5-1/2",6-5/8",7",7-5/8",8-5/8",9-5/8",20" BTC:4-1/2",5",5-1/2",6-5/8",7",7-5/8",8-5/8",9-5/8",10-3/4",11-3/4",13-3/8",16",18-5/8",20".