Hardness unit conversion

Use this tool to convert between multiple hardness units, including Rockwell hardness (HRA, HRB, HRC, HRD), Brinell hardness (HBS, HBW), Vickers hardness (HV), Shore hardness ( HS), and approximate tensile strength. Conversion based on American ASTM E 140 standard, interval values use linear interpolation.

Rockwell hardness

HRA

60kgf diamond cone 60.5 - 85.6

HRB

100kgf steel ball 97.8 - 109.0

HRC

150kgf diamond cone 20 - 68

HRD

100kgf diamond cone 40.1 - 76.9

Superficial Rockwell hardness

HR 15N

15kgf diamond cone 69.4 - 93.2

HR 30N

30kgf steel ball 41.5 - 84.4

HR 45N

45kgf diamond cone 19.6 - 75.4

Brinell hardness

HB, HBS

3000kgf standard ball 226 - 500

HBW

3000kgf tungsten carbide ball 226 - 739

Vickers hardness

50kgf diamond cone 238 - 940

Shore hardness

Bounce height of ram 34 - 97

Tensile strength

MPa

770 - 2075

Unit conversion relations

HRC

HRA

60.5

HRB

97.8

HRD

40.1

HRC

15N

69.4

30N

41.5

45N

19.6

HRC

226

238