... tube with high precise ID can be used for pneumaticcylinder, forklift, jack, telescopic cylinder, treadmill and other sports equipment. ... DIN ST45 / NF TU37b / ISO TS4∨Carbon steel tubes for machine structural purposerDIN 2391 ST521.0580JIS STKM19A / ASTM 1524 / ... 8 / NF TU42c∨Seamless carbon steel pipe for high temperature service ∨Suitable for bending, flanging, welding and similar forming operations ...