[Features] ●Master gauge for adjusting the zero point of internal diameter measuring instruments. ●Sub-zero treatment and stabilization treatment have been performed to prevent deterioration over time. ●Inspection report included
[Application] ●As a master for internal diameter measuring instruments.
[Specifications] ●Nominal dimension (mm): 40 ●Thickness (mm): 18 ●Outer diameter (mm): 71 ●Inner diameter tolerance: ±1.0 μm (1 or more to 30 or less), ±1.5 μm (more than 30 to 50 or less), ±2.0 μm (more than 50 to 100 or less), ±5.0 μm (more than 100 to 200 or less) ●Surface roughness: Within Ra0.1 μm ●Straightness: 0.05/φ100 ●Parallelism: Within 0.015 mm
[Specification 2] ●Inspection report included ●Circularity: Within 0.5 μm (1 to 30), 0.8 μm or less (over 30 to 50) ●Hardness: 653 to 772 HV
