1)api 5l gr.b sch 40 2)OD:1/2"-48" ... so on.StandardsANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M---1996, DIN2605 / 2615 / 2616, JIS P2311 ... joint; flat face(FF); threadedForged fittingsType:Elbow, Tee, Union, Cross, Coupling, Cap, Bushing, Plug, Swage Nipple, Hexagon Nipple,Nipple, Hexagon Nut ... to visite our website , your inquiries will be reply promptly! api 5l gr.b sch 40