JIS・ISOによる唯一の専門メーカー 高精度硬さ基準片 Standard Blocks for Hardness ISO 9001  JQA-2078

YSTL's Hardness Blocks have become global brands.

Yamamoto Scientific Tool Laboratory (YSTL) was established in 1952 as the world's first manufacturer specializing in standards hardness blocks in Funabashi city, Chiba. Since then, YSTL's hardness blocks are used in a wide range of countries throughout Europe, America, Australia, and Asia because of their global reputation for superior quality; 

①Hardness uniformity meeting world’s highest standards, 

②Universal reference values based on JIS/ISO standards for international acceptance, 

③Highly stable and reliable hardness values, as well as their traceability to international standards. 

As a company with customers around the world, we will continue to promote the global development of our hardness block business by deepening international technological exchanges and building closer alliances with overseas distributors to expand our sales network.

More details  Company Profile (PDF 0.7MB)


JCSS (ISO/IEC 17025, ILAC/MRA) accreditation

In March 2020, Brinell hardness accreditation obtained, following Rockwell hardness and Vickers hardness.

  Accreditation certificate (PDF 1.2MB) Catalog (PDF 0.6MB)

Introduction of the new hardness tester "eNM"

 References Japanese (PDF 4.5MB) English (PDF 4.3MB)

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