The Rockwell hardness tester is a popularly-used hardness testing instrument to measure the Rockwell hardness of the materials. The speed of loading the test force is regulated by the buffer whereas the change of the test force is made by rotating the carriage-changing hand-wheel. The operation of the present instrument is simple, its functions are stable.
Hardness Scale
Hardness Range of the Standard Blocks
Max Tolerance of the Indicated Values
HRA
(20～75)HRA
±2HRA
(＞75～88)HRA
±1.5HRA
HRB
(20～45)HRB
±4HRB
(＞45～80)HRB
±3HRB
(＞80～100)HRB
±2HRB
HRC
(20～70)HRC
±1.5HRC
HRD
(40～70)HRD
±2HRD
(＞70～77)HRD
±1.5HRD
HRE
(70～90)HRE
±2.5HRE
(＞90～100)HRE
±2HRE
HRF
(60～90)HRF
±3HRF
(＞90～100)HRF
±2HRF
HRG
(30～50)HRG
±6HRG
(＞50～75)HRG
±4.5HRG
(＞75～94)HRG
±3HRG
HRH
(80～100)HRH
±2HRH
HRK
(40～60)HRK
±4HRK
(＞60～80)HRK
±3HRK
(＞80～100)HRK
±2HRK
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