SK Steel Ring Gauge Master Ring Gauge +- Tolerance 87.5mm RG-87.5 1 pc

Catalog number: RG-87.5 Features: ●Master gauge for adjusting the zero point of an internal diameter measuring instrument. ●Sub-zero treatment and stabilization treatment have been performed to prevent deterioration over time. Applications: ●As a master for internal diameter measuring instruments. Specifications: ●Nominal dimension (mm): 87.5 ●Thickness (mm): 24 ●Outer diameter (mm): 140 ●Inner diameter tolerance: ±1.0 μm (1 or more to less than 30), ±1.5 μm (more than 30 to less than 50), ±2.0 μm (more than 50 to less than 100), ±5.0 μm (more than 100 to less than 200) ●Surface roughness: Within Ra0.1 μm ●Straightness: 0.05/φ100 ●Parallelism: Within 0.015 mm ●Inspection report included ●Diameter difference: 1.0 μm (1 or more to less than 30), 1.6 μm (more than 30 to less than 50), 2.0 μm (more than 50 to less than 100), 4.0 μm (more than 100 to less than 200) ●Hardness: 653 to 772 HV Material/Finish: ●Alloy tool steel Note: ●Special sizes are also available.