Chrome Piston Rod SAE 1045 Chrome Plated Steel Tie Rod 6M for Machinery I. Technical Data Technical Item Specifications & Standards Material CK45, 4140, 42CrMo4, ST52, Stainless Steel Diameter Range 16mm — 250 mm Diameter Tolerance ISO f7 Surface Hardness HRC 55 - 63 (Induction Hardened) Chrome Layer Thickness 20μm — 50μm+ (Customizable upon request) Salt Spray Test NSS 96 Hours (Up to 500H for specialized conditions) Surface Roughness Ra 0.2 - 0.4 μm (Mirror Polished)