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 ... , Cap, Bushing, Plug, Swage Nipple, Hexagon Nipple,Nipple, Hexagon Nut, Insert, Weldolet, Elbowlet, Sockolet,Thredolet, Nipolet, Letrolet, etcPressure:2000LBS,3000LBS,6000LBS ... to visite our website , your inquiries will be reply promptly! api 5l gr.b sch 40