To verify hardness tester to be in good working condition

To control various industrial hardness testers, it is important to verify all related factors, inculiding indenters, static and dynamic loads, indentation measurement, and sample pieces. Hardness blocks allow overall control of this coomplicated factors in the field. Therefore, it is imperative that a uniform surface hardness is displayed by all our test blocks, that the main factors of secular change are eliminated and, if possible, that the characteristic of their materials are similar to those of materials in practical use.

Material and manufacturing process

Yamamoto’s blocks are first cut from a plate material to avoid being affected by center segregation. After machining to the required shapes, heat treatment is carefully applied to the blocks to get a stable microstructure and the required hardness level.

After heat treatment is completed, the blocks are ground, lapped, and then undergo a thorough polishing process, followed by wet buffing to improve measuring precision and achieve the most accurate and consistent hardness available.

Yamamoto Metal Hardness Test Block has been manufactured since 1939 and maintained her reputation as the best in this field. The company received ISO 9001 Quality System certificate in 1997, issued by Japan Quality Assurance Organization (JQA).