Yamamoto Metal Hardness Test Block
Yamamoto metal hardness test blocks serve as precision reference standards for verifying hardness testers. Manufactured with tight tolerances and minimal variation (as low as ±0.1 HRC in some ranges), they provide stable, traceable benchmarks across Rockwell, Vickers, and other scales.
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These reference blocks from Yamamoto ensure uniform surface hardness and long-term stability, thanks to careful heat treatment, grinding, and polishing processes. They are essential for calibrating or checking hardness measuring instruments in laboratories and field environments.
Yamamoto Metal Hardness Test Block
Yamamoto hardness blocks are built to rigorous standards with ISO 9001 certification. They cover a wide variety of scales—Rockwell, Brinell, Vickers—are traceable and designed to minimize secular changes. Their consistent performance makes them a trusted calibration reference.
Features
Overview
| Specification | Detail |
|---|---|
| Product | Yamamoto Standard Hardness Test Block |
| Diameter | 64 mm (common test block size) |
| Typical Hardness Values | HRC: 10, 20, 25, 30, 35, 40, 45, 50, 55, 60, 62, 64, etc. |
| Tolerance / Variation | ±0.1 to ±0.15 HRC (depending on range) |
| Material / Manufacturing | Eutectoid carbon steel, processed to avoid center segregation, then ground, lapped, polished |
| Certification / Traceability | Blocks often come with calibration certificates traceable to national standards (e.g., NIST) |
| Durability / Lifespan | Designed to minimize secular changes; usable for many years under proper use |
