... ,30/14, 30/16,40/16,40/16S,40/20,52/26 DingRun High Quality Self-drilling Anchor Bolt R51N1)Business Type: Manufacture ... Ra0.4-0.6. The types of steel tubes include 10#, 20#, 35#, 45#, 160Mn, 20GrMo, 35GrMo, 40Gr. The products have ... profiles. They are widely adept in auto, hydraulic machinery, gas spring system, shock absorbers, precision instruments, anchoring machinery and construction machinery ...