[Features] ● Master gauge for zero-point adjustment of inner diameter measuring instruments. ● Sub-zero treatment to prevent aging and stabilization treatment. With inspection report
[Applications] ●As a master for inner diameter measuring instruments.
[Specifications] - Nominal size (mm): 50 - Thickness (mm): 20 - Outer diameter (mm): 85 - Inner diameter tolerance: ±1.0 μm (1 to 30 or less), ±1.5 μm (over 30 50 or less), ±2.0 μm (over 50 to 100 or less), ±5.0 μm (over 100 to 200 or less) Surface roughness: within Ra0.1 μm Perpendicularity: 0.05/φ100 Parallelism: within 0.015 mm
[Specification 2] ● Inspection report included ● Roundness: within 0.5 μm (1 or more to 30 or less), 0.8 μm or less (over 30 to 50 or less) ● Hardness: 653 to 772 HV
