... Tube 1.OD: 1/2"-18" 2.Tck: 2 - 60 mm 3.Certificated: API & ISO 4.MOQ: 20 Carbon Tube ... Steel Seamless Tube1.OD: 1/2"-18"2.Tck: 2 - 60 mm 3.Certificated: API & ISO 4.MOQ:20seamless steel pipe ... StandardAPI 5CT, 5L; ASTM, BS, JIS, DINSteel GradeAPI 5L Grade B/ASTM A106B, BS 1387O.D.1/2"--18"W.T ... API 5CT, 5L; ASTM, BS, JIS, DIN A106 Grade B Seamless Steel TubeSteel Tube,Carbon Tube,Steel Seamless Tube