备注：Description : Hollow piston rods. Specification : 1. External diameter accuracy: f82. Surface roughness: Ra 0.2μm ~ Ra 0.4μm.3. Surface hardness: HV 800(minimum)up4. Standard length: 1M - 6M.5. Hard chrome thickness: 20 micron ± 10%6. Material: JIS STKM 13C OR STKM 13A(Other specifications can be made customer request based on)
