ASTM D785
The ASTM D785 is the foremost standard for the testing of the Rockwell hardness scales. It is a trusted test of indentation hardness which ensures precise and accurate results no matter the material. ASTM D785 determines the net increase in depth of the indentor using a specified minor load and then increasing it to a major load before decreasing it back to the minor load. With every division of the Rockwell scale measuring 0.002 mm (0.00008 in) penetration, it can easily identify the depth.
Rockwell Hardness - ASTM D785 Test Parameters
| Scale | Minor Load (kg) | Major Load (kg) | Indentor Diameter (in) | Indentor Diameter (mm) |
|---|---|---|---|---|
| R | 10 | 60 | 0.5 | 12.7 |
| L | 10 | 60 | 0.25 | 6.35 |
| M | 10 | 100 | 0.25 | 6.35 |
| E | 10 | 100 | 0.125 | 3.175 |
| K | 10 | 150 | 0.125 | 3.175 |
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