硬度標尺

標準塊的硬度范圍

示值Max允許誤差

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