备注:Description : Seamless tube(id honed&od chromium plated) for telescopic hydraulic cylinder. Specification : 1. External diameter accuracy: f82. Surface roughness: Ra 0.2μm ~ Ra 0.4m3. Hard chrome thickness: 20 micron ± 10%4. Surface hardness: HV 800(minimum)up5. Internal diameter accuracy: H7 - H8