45# Cold Drawn Precision Seamless Steel Tube, Grade 45 (AISI1045 / C45 / S45C), Standard GB/T3639, NBK bright annealed, smooth surface without oxide skin.
OD:10–168mm, WT:1.5–10mm, stock length 6m, can be cut to size.
High dimensional tolerance, good machinability, widely used for hollow shaft, machinery parts, hydraulic cylinder barrel.