Technical Reference
272
Steel Hardness Chart
CROSS-REFERENCE BETWEEN DIFFERENT HARDNESS MEASUREMENTS
BRINELL HARDNESS BHN*
VICKERS HARDNESS HV 136° DIAMOND PYRAMID, 10kgf LOAD
ROCKWELL HARDNESS HRA BRALE PENETRATOR, 60kgf LOAD
ROCKWELL HARDNESS HRB
ROCKWELL HARDNESS HRC BRALE PENETRATOR, 150kgf LOAD
SHORE HARDNESS HS
10mm BALL, 3000kgf LOAD
1/16 INCH BALL, 100kgf LOAD
86 95
90
48
100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 740 760 780 800 840 880
56.2 62.3 66.7 71.2
105 114 124 133 143 152 162 171 181 190 200 209 219 228 238 247 256 265 275 284 303 322 341 360 379 397 415 433 452 471 488 507 525 545 564 582 601 620 638 656 670 684 698 710 722 745 767
20 21 22 24 25 26 28 29 30 32 33 34 36 37 38 40 41 42 45 47 50 52 55 57 59 62 64 66 67 69 71 72 74 75 77 79 80 81 83 84 86 87 88 91 93
75
78.7 81.7
(0) (3) (6)
85
87.1 89.5 91.5 93.4
(8.5) (11)
(13.4) (15.7)
95
96.7 98.1 99.5
(18) 20.3 22.2
60.7 61.6 62.4 63.1 63.8 64.5 65.2 66.4 67.6 68.7 69.8 70.8 71.8 72.8 73.6 74.5 75.3 76.1 76.7 77.4
(101) (102)
24
25.6 27.1 28.5 29.8 32.2 34.4 36.6 38.8 40.8 42.7 44.5 46.1 47.7 49.1 50.5 51.7
(103.5) (104.5) (105.5)
(107) (108) (109) (110)
53
78
54.1 55.2 56.3 57.3 58.3 59.2 60.1
78.6 79.2 79.8 80.3 80.8 81.3 81.8 82.2 82.6
61
61.8 62.5 63.3
83
83.4 84.1 84.7
64
65.3 66.4
*A 10mm steel ball is used for 450 BHN and below. A 10mm carbide ball is used above 450 BHN.
Also known as Firth Diamond Hardness Number.
Values in parentheses are not contained in the normal definition range for hardness checking, but are often used in a comparable measure.
All values shown in this chart are approximate and intended only as a reference guide.
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