References
■ Hardness Scale Comparison Chart ● Approximate corresponding values for steel hardness on the Brinell scale
Rockwell Hardness
Rockwell Hardness
A Scale 60kgf brale
B Scale 100kgf 1/10in ball HRB
C Scale 150kgf brale
D Scale 100kgf brale
A Scale 60kgf brale
B Scale 100kgf 1/10in ball HRB
C Scale 150kgf brale
D Scale 100kgf brale
Brinell 3,000kgf
Vickers 50kgf
Shore Hardness
Tensile Strength (GPa)
Brinell 3,000kgf
Vickers 50kgf
Shore Hardness
Tensile Strength (GPa)
HRA
HRC
HRD
HRA
HRC
HRD
HB
HV
HS
HB
HV
HS
— 85.6 — 68.0 76.9 940 97 —
321 67.5 (108.0)
34.3 50.1 339 47 1.06
— 85.3 — 67.5 76.5 920 96 —
311 66.9 (107.5)
33.1 50.0 328 46 1.03
N
— 85.0 — 67.0 76.1 900 95 —
302 66.3 (107.0)
32.1 49.3 319 45 1.01
767 84.7 — 66.4 75.7 880 93 —
293 65.7 (106.0)
30.9 48.3 309 43 0.97
757 84.4 — 65.9 75.3 860 92 —
285 65.3 (105.5)
29.9 47.6 301 — 0.95
745 84.1 — 65.3 74.8 840 91 —
277 64.6 (104.5)
28.8 46.7 292 41 0.92
733 83.8 — 64.7 74.3 820 90 —
269 64.1 (104.0)
27.6 45.9 284 40 0.89
722 83.4 — 64.0 73.8 800 88 —
262 63.6 (103.0)
26.6 45.0 276 39 0.87
255 63.0 (102.0)
25.4 44.2 269 38 0.84
712
— — — — — — —
248 62.5 (101.0)
24.2 43.2 261 37 0.82
710 83.0 — 63.3 73.3 780 87 —
241 61.8 100.0 22.8 42.0 253 36 0.80
698 82.6 — 62.5 72.6 760 86 —
235 61.4 99.0 21.7 41.4 247 35 0.78
684 82.2 — 61.8 72.1 740 — —
229 60.8 98.2 20.5 40.5 241 34 0.76
682 82.2 — 61.7 72.0 737 84 —
223
— 97.3 (18.8)
— 234 — —
670 81.8 — 61.0 71.5 720 83 —
217
— 96.4 (17.5)
— 228 33 0.73
656 81.3 — 60.1 70.8 700 —
—
212
— 95.5 (16.0)
— 222 — 0.71
653 81.2 — 60.0 70.7 697 81 —
207
— 94.6 (15.2)
— 218 32 0.69
647 81.1 — 59.7 70.5 690 — —
201
— 93.8 (13.8)
— 212 31 0.68
638 80.8 — 59.2 70.1 680 80 —
197
— 92.8 (12.7)
— 207 30 0.66
630 80.6 — 58.8 69.8 670 — —
192
— 91.9 (11.5)
— 202 29 0.64
627 80.5 — 58.7 69.7 667 79 —
187
— 90.7 (10.0)
— 196 — 0.62
601 79.8 — 57.3 68.7 640 77 —
183
— 90.0 (9.0)
— 192 28 0.62
578 79.1 — 56.0 67.7 615 75 —
179
— 89.0 (8.0)
— 188 27 0.60
555 78.4 — 54.7 66.7 591 73 2.06
174
— 87.8 (6.4)
— 182 — 0.59
534 77.8 — 53.5 65.8 569 71 1.98
170
— 86.8 (5.4)
— 178 26 0.57
514 76.9 — 52.1 64.7 547 70 1.89
167
— 86.0 (4.4)
— 175 — 0.56
495 76.3 — 51.0 63.8 528 68 1.82
163
— 85.0 (3.3)
— 171 25 0.55
477 75.6 — 49.6 62.7 508 66 1.73
156
— 82.9 (0.9)
— 163 — 0.52
461 74.9 — 48.5 61.7 491 65 1.67
149
— 80.8 — — 156 23 0.50
444 74.2 — 47.1 60.8 472 63 1.59
143
— 78.7 — — 150 22 0.49
429 73.4 — 45.7 59.7 455 61 1.51
137
— 76.4 — — 143 21 0.46
415 72.8 — 44.5 58.8 440 59 1.46
131
— 74.0 — — 137 — 0.45
401 72.0 — 43.1 57.8 425 58 1.39
126
— 72.0 — — 132 20 0.43
388 71.4 — 41.8 56.8 410 56 1.33
121
— 69.8 — — 127 19 0.41
375 70.6 — 40.4 55.7 396 54 1.26
116
— 67.6 — — 122 18 0.40
363 70.0 — 39.1 54.6 383 52 1.22
111
— 65.7 — — 117 15 0.38
352 69.3 (110.0)
37.9 53.8 372 51 1.18
1) Figures within the ( ) are not commonly used. 2) Rockwell A, C and D scales utilise a diamond brale. 3) This chart was taken from the JIS Iron and Steel Handbook (1980).
341 68.7 (109.0)
36.6 52.8 360 50 1.13
331 68.1 (108.5)
35.5 51.9 350 48 1.10
N72
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