Standard: ASTM A53, ASTM A106, API 5L, APL 5CT, ASTM A519, ASTM A213/A213M Steel Pipe Outside diameter: 21.3 to 323.8mm (1/2"-12") Steel Pipe Thickness: 1.8 to 20mm Zinc coating: 350 to 480G/M2 Type of end finish: 8TPI thread, one side seamless coupling and one side plastic cap, plain end. Packing: Labeled and bundled together with steel strip Application: It is mainly applied to healthy drink water transportation and low pressure liquid and gassy transportation, good structure steel pipe used in building and bridge field