Hardness testing blocks, made of carbon steel are used to calibrate metal hardness testers and come in various standard nominal values, such as 25 HRC, 45 HRC, 65 HRC, 90 HRB, and 83 HRA.
Hardness testing blocks are designed for metals hardness testers calibration.
There are available different standard nominal values of the blocks, such as: 25 HRC, 45 HRC, 65 HRC, 90 HRB, 83 HRA.
Basically, the blocks are made from Carbon Steel, but also available blocks are made from Brass and Aluminium.
The blocks meet ASTM E18Â standard.
| Hardness value | Load, kg | Surface homogeneity | Dimension, mm | Material |
| HRA: 83±3 | 60 | 0,6 HRA | 60х40х6 | Carbon steel |
| HRB: 90±10 | 100 | 1,2 HRB | 60х40х6 | Carbon steel |
| HRC: 65±5 | 150 | 0,5 HRC | 60х40х6 | Carbon steel |
| HRC: 45±5 | 150 | 0,8 HRC | 60х40х10 | Carbon steel |
| HRC: 25±5 | 150 | 1,1 HRC | 60х40х10 | Carbon steel |
| HRB: 20 | 100 |  – |  – | Brass |
| HRB: 50 | 100 |  – |  – | Brass |
| HRB: 20 | 100 |  – |  – | Aluminum |
| HRB: 70 | 100 |  – |  – | Aluminum |
| HRE: 58 | 100 |  – |  – | Aluminum |
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