Cold draw seamless steel tube Features: 1) Usage: used in hydraulic ... : OD 2-3/8" ~ 4-1/2" 3) Standard: API Cold draw seamless steel tubeFeatures: 1)Steel tube2) Grade 20# 45 ... -H107) Roughness(Ra): 0.8 to 0.1.6ยต8)Type: cold drawing, normalizing treatment9) Condition: BK, BKW, BKS, NBK, GBK10) Prime ... part,shock absorber, hydraulic cylinder, and other cylinders. Din st33 Cold Draw Seamless Steel Tube