Hardness Conversion Chart
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Hardness Conversion Chart
B rinell
Tensile
B rinell
Tensile
R ockwell Ha rdness
R ockwell Ha rdness
Ha rdness
St rength
Ha rdness
St rength
Tungsten
Tungsten
A Sc a le
B Sc a le
C Sc a le
(Approx
A Sc a le
B Sc a le
C Sc a le
(Approx
Ca rbide B a ll
Ca rbide B a ll
60 K g
100 K g
150 K g
psi)
60 K g
100 K g
150 K g
psi)
3000 K g
3000 K g
85.6
68
331
68.1
35.5
166,000
85.3
67.5
321
67.5
34.3
160,000
85
67
311
66.9
33.1
155,000
767
84.7
66.4
302
66.3
32.1
150,000
757
84.4
65.9
293
65.7
30.9
145,000
745
84.1
65.3
285
65.3
29.9
141,000
733
83.8
64.7
277
64.5
28.8
137,000
722
83.4
64
269
64.1
27.6
133,000
712
262
63.6
26.6
129,000
710
83
63.3
255
63
25.4
126,000
698
82.6
62.5
248
62.5
24.2
122,000
684
82.2
61.8
241
61.8
100
22.8
118,000
682
82.2
61.7
235
614
99
21.7
115,000
670
81.8
61
229
60.8
98.2
20.5
111,000
656
81.3
60.1
223
97.3
20
653
81.2
60
217
96.4
18
105,000
647
81.1
59.7
212
95.5
17
102,000
638
80.8
59.2
329,000
207
94.6
16
100,000
630
80.6
58.8
324,000
201
93.8
15
98,000
627
80.5
58.7
323,000
197
92.8
95,000
601
79.8
57.3
309,000
192
91.9
93,000
578
79.1
56
297,000
187
90.7
90,000
555
78.4
54.7
285,000
183
90
89,000
534
77.8
53.5
274,000
179
89
87,000
514
76.9
52.1
263,000
174
87.8
85,000
495
76.3
51
253,000
170
86.8
83,000
477
75.6
49.6
243,000
167
86
81,000
461
74.9
48.5
235,000
163
85
79,000
444
74.2
47.1
225,000
156
82.9
76,000
429
73.4
45.7
217,000
149
80.8
73,000
415
72.8
44.5
210,000
143
78.7
71,000
401
72
43.1
202,000
137
76.4
67,000
388
71.4
41.8
195,000
131
74
65,000
375
70.6
40.4
188,000
126
72
63,000
363
70
39.1
182,000
121
69.8
60,000
352
69.3
37.9
176,000
116
67.6
58,000
341
68.7
36.6
170,000
111
65.7
56,000
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