ISO 9001 Quality System

Yamamoto’s hardness blocks are ISO 9001 certified, complying with requirement of the ISO standards. The register certificate No. is JQA – 2078 ISO 9001 – 2000 / JIS Q 9001 : 2000

Integrated Precision of Hardness Tester and Hardness Blocks

Force, indenter, indentation measurement and movement condition should be separately inspected to metrically verify the integrated precision of hardness tester. On the other hand, indirect verification of a tester with test blocks is used to integrally verify those respective conditions. Yamamoto Scientific Tool Laboratory Co., Ltd. does their utmost in material selection, heat treatment, and other processes to achieve the world’s highest accuracy.

Durability of Yamamoto Standard Block for Hardness

Secular changes of all Yamamoto’s blocks are eliminated by a sufficient heat treatment process, regardless of the block type. Due to work hardening near and around the perimeters of indentations, the usable test areas is limited, as JIS prescribes it to be 4d (d  = diameter of the indentations) as spaces between indentations.