Standard length: 5.5 mtrs. Ref. JIS-G-3454 (STPG-370) standard industrial quality. STPG denotes Steel Tube Piping General. Equal quality to ASTM A135/A53 or DIN1626/1629 and ISO2604. Both ends are plain ends. Available in black only. Two types of electric resistant welding (ERW) and seamless pipes are available. Most common schedule (Wall Thickness) Number 40 and 80 are listed below.