4mm Diameter Bearing Steel (Gcr15) Material Cylindrical Roller Positioning Pin. Dual Material Options: Available in Bearing Steel (Gcr15/SUJ2) or Stainless Steel for diverse applications. High Hardness & Durability: Quenched to HRC 58-64, ensuring rust-proof, wear-resistant, and long-lasting performance. Customizable Dimensions: Diameter ranges from 1-60mm with custom length options and precise tolerances. Precision Engineering: Features P6 precision rating with tight ID tolerance (-0.01-0mm) and length tolerance. Versatile Industrial Use: Ideal for CNC machines, molds, automation equipment, and precision measuring instruments. Smooth Surface Finish: Polished surface provides high strength, rigidity, and excellent wear resistance. OEM/ODM Services: Full customization support available for product name, type, and specific structural requirements. Wide Size Range: Models available from 1mm to 60mm diameter, covering 5mm to 60mm length specifications.