Standard length: 5.5 mtrs. Ref. JIS-G-3456 (STPT-370) standard industrial quality. STPT denotes Steel Tube Piping Temperature. Equal quality to ASTM A106, DIN17175, BS3602 and ISO2604. Available in black only. Most common schedule (Wall Thickness) number 40, 80 and 160 are listed below. They are used for temperatures over 350oC.