The hardness reference block

for indirect and periodic calibration of your hardness testing machine.

SiB testblock

The hardness reference block
"Made in Germany"

Hardness reference blocks are used for annual indirect calibration and periodic daily testing of hardness testers. The functional reliability of hardness testers and their traceability to the hardness standard can only be ensured with high-quality hardness reference blocks.

The synergy between the use of optimised, homogeneous steel, decades of experience in heat treatment and the CNC machining of hardness reference blocks provides you with a first-class product "Made in Germany" that meets the requirements for the following tests:

  • DIN EN ISO 6506 / ASTM E10
    (Metallic materials; hardness test according to Brinell)
  • DIN EN ISO 6508 / ASTM E18
    (Metallic materials; hardness test according to Rockwell)
  • DIN EN ISO 6507 / ASTM E92
    (Metallic materials; hardness test according to Vickers)

Independent Calibration

Manufacturer-independent calibration by DIN EN ISO/IEC 17025:2018 accredited testing laboratories ensures a high level of quality assurance for the hardness reference blocks.

Delivery range
Colour assignment



Delivery range

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To the distribution partners


Colour and symbol assignment

If you have to keep many different test panels, it is easy to lose track. Thanks to the colour and symbol assignment on each individual SiB test block packaging, you can find the right test plate straight away.

  • test procedure by colour  
  • test procedure by symbol
  • calibrated hardness value  
  • date of calibration

The SiB test block offers the following advantages:

  • „Made in Germany“ by means of the synergy provided by the use of optimised, homogeneous steel, decades of experience in heat treatment and CNC machining
  • independent calibration according to DIN EN ISO/IEC 17025:2018
  • labelling of the reference impressions
  • visual depiction of testing impressions according to Vickers
  • grid lines (optional)
  • multiple calibration (optional)
  • free software for documentation of periodical testing
  • qualified advice
  • quick availability