Yamamoto (YSTL) standard reference blocks for hardness from Japan are used for verification that your hardness tester is measuring within tolerances and is compliant with performance standards.  

The Yamamoto blocks are the premier standard reference blocks in the industry.  The calibration test blocks are calibrated using a Rockwell HRC standard reference in accordance to ASTM E18-00 section C.

A wide range of standard blocks are available in regular, superficial and special scales with precision tolerances. Certified blocks are traceable to NIST.


Yamamoto blocks are available in various nominal hardness values across the following test scales:

Rockwell scales: HRA, HRB, HRC, HR15N, HR15T, HR30N, HR30T

Brinell scale: HB10/3000

Vickers scale: HV10, HV30, HMV1, HMV0.1, HMV0.001


Please contact us with your specific requirements.



SKU Yamamoto
Brand Yamamoto

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