The hardness measurement of motor carbon brushes mainly includes two methods: customized Rockwell hardness according to DIN 51917 standard and Shore hardness tester measurement.

The Rockwell hardness method is mainly based on the DIN51917 standard

The measured head diameters are 2.5, 5, 10MM, and the loads are 7, 20, 40, 60, 100, and 150KG.

The recommended motor carbon brush hardness tester is the new automatic Rockwell hardness tester from Japan's Matsuzawa, which uses a closed-loop feedback loading sensor and can well meet the load customization requirements of DIN51917.

The load capacity can be customized within the range of 3-187.5KG, and there is an automatic lowering function of the pressure head that can achieve one click measurement, automatically reducing human interference throughout the process.