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Hardness Conversions
and Tensile Strength

Rockwell
Rockwell Superficial
Brinell
Vickers
Shore
Approx.
Tensile
Strength
(psi)
A
60 kg
Brale
86.5
86.0
85.6
85.0
84.5

83.9
83.4
82.8
82.3
81.8

81.2
80.7
80.1
79.6
79.0

78.5
78.0
77.4
76.8
76.3

75.9
75.2
74.7
74.1
73.6

73.1
72.5
72.0
71.5
70.9

70.4
69.9
69.4
68.9
68.4

67.9
67.4
66.8
66.3
65.8

65.3
64.7
64.3
63.8
63.3

62.8
62.4
62.0
61.5
61.0

60.5
59.0
58.0
57.5
57.0

56.5
56.0
55.5
55.0
54.0

53.5
53.0
52.5
52.0
51.0

50.5
50.0
49.5
49.0
48.5

48.0
47.0
46.5
46.0
45.5

45.0
44.5
44.0
43.5
43.0

42.5
42.0
41.8
41.5
41.0

40.5
40.0
39.5
39.0
38.5

38.0
37.8
37.5
37.0
36.5

36.0
35.5
35.0
34.8
34.5

34.0
33.5
33.0
32.5
32.0

31.5
31.0
30.8
30.5
30.0

29.5
29.0
28.5
28.0
27.8

27.5
27.0
26.5
26.0
25.5

25.0
24.5
24.2
24.0
23.5

23.0
22.5
22.0
21.5
21.2

21.0
20.5
20.0

















B
150 kg
1/16"Ball


















120
120
119
119
118

117
117
116
116
115

115
114
113
113
112


112
111
110
110
109

109
108
108
107
106

105
104
104
103
103

102
101
100
99

98

97
96
95
94
93

92
91
90
89
88

87
86
85
84
83

82
81
80
79
78

77
76
75
74
73

72
71
70
69
68

67
66
65
64
63

62
61
60
59
58

57
56
55
54
53

52
51
50
49
48

47
46
45
44
43

42
41
40
39
38

37
36
35
34
33

32
31
30
29
28

27
26
25
24
23

22
21
20
19
18

17
16
15
14
13

12
11
10
9
8

7
6
5
4
3

2
1
0
C
150 kg
Brale
70
69
68
67
66

65
64
63
62
61

60
59
58
57
56

55
54
53
52
51

50
49
48
47
46

45
44
43
42
41

40
39
38
37
36

35
34
33
32
31

30
29
28
27
26

25
24
23
22
21

20
18
16
15
13

12
10
9
8
7

6
5
4
3
2

1
0
































































































D
100 kg
Brale
78.5
77.7
76.9
76.1
75.4

74.5
73.8
73.0
72.2
71.5

70.7
69.9
69.2
68.5
67.7

66.9
66.1
65.4
64.6
63.8

63.1
62.1
61.4
60.8
60.0

59.2
58.5
57.7
56.9
56.2

55.4
54.6
53.8
53.1
52.3

51.5
50.8
50.0
49.2
48.4

47.7
47.0
46.1
45.2
44.6

43.8
43.1
42.1
41.6
40.9

40.1



















































































































E
100 kg
1/8"Ball



























































































100.0
99.5
99.0
98.0

97.5
97.0
96.0
95.5
95.0

94.5
93.5
93.0
92.5
92.0

91.0
90.5
90.0
89.5
89.0

88.0
87.5
87.0
86.5
85.5

85.0
84.5
84.0
83.5
82.5

82.0
81.5
81.0
80.0
79.5

79.0
78.5
78.0
77.0
76.5

76.0
75.5
75.0
74.0
73.5

73.0
72.5
72.0
71.0
70.5

70.0
69.5
68.5
68.0
67.5

67.0
66.5
65.5
65.0
64.5

64.0
63.5
62.5
62.0
61.5

61.0
60.5
60.0
59.0
58.5

58.0
57.5
57.0
F
60 kg
1/16"Ball






















































































99.5
99.0
98.5

98.0
97.5
97.0
96.0
95.5

95.0
94.5
94.0
93.5
93.0

92.0
91.5
91.0
90.5
90.0

89.5
89.0
88.0
87.5
87.0

86.5
86.0
85.5
85.0
84.5

84.0
83.0
82.5
82.0
81.5

81.0
80.5
79.5
79.0
78.5

78.0
77.5
77.0
76.5
75.5

75.0
74.5
74.0
73.5
73.0

72.5
72.0
71.0
70.5
70.0

69.5
69.0
68.5
68.0
67.0

66.5
66.0
65.5
65.0
64.5

64.0
63.5
63.0
62.0
61.5

61.0
60.5
60.0
59.5
59.0

58.0
57.5
57.0
15-N
15 kg
Brale
94.0
93.5
93.2
92.9
92.5

92.2
91.8
91.4
91.1
90.7

90.2
89.8
89.3
88.9
88.3

87.9
87.4
86.9
86.4
85.9

85.5
85.0
84.5
83.9
83.5

83.0
82.5
82.0
81.5
80.9

80.4
79.9
79.4
78.8
78.3

77.7
77.2
76.6
76.1
75.6

75.0
74.5
73.9
73.3
72.8

72.2
71.6
71.0
70.5
69.9

69.4



















































































































30-N
30 kg
Brale
86.0
85.0
84.4
83.6
82.8

81.9
81.1
80.1
79.3
78.4

77.5
76.6
75.7
74.8
73.9

73.0
72.0
71.2
70.2
69.4

68.5
67.6
66.7
65.8
64.8

64.0
63.1
62.2
61.3
60.4

59.5
58.6
57.7
56.8
55.9

55.0
54.2
53.3
52.1
51.3

50.4
49.5
48.6
47.7
46.8

45.9
45.0
44.0
43.2
42.3

41.5



















































































































45-N
45 kg
Brale
77.6
76.5
75.4
74.2
73.2

72.0
71.0
69.9
68.8
67.7

66.6
65.5
64.3
63.2
62.0

60.9
59.8
58.6
57.4
56.1

55.0
53.8
52.5
51.4
50.3

49.0
47.8
46.7
45.5
44.3

43.1
41.9
40.8
39.6
38.4

37.2
36.1
34.9
33.7
32.5

31.3
30.1
28.9
27.8
26.7

25.5
24.3
23.1
22.0
20.7

19.6



















































































































30-T
30 kg
1/16"Ball
























































82.0
81.5
81.0

80.5
80.0
79.0
78.5
78.0

77.5
77.0
76.0
75.5
75.0

74.5
74.0
73.5
73.0
72.0

71.5
71.0
70.0
69.5
69.0

68.0
67.5
67.0
66.0
65.5

65.0
64.2
63.5
62.8
62.0

61.4
60.5
60.1
59.5
58.7

58.0
57.3
56.5
55.9
55.0

54.6
54.0
53.2
52.5
51.8

51.0
50.4
49.5
49.1
48.5

47.7
47.0
46.2
45.5
44.8

44.0
43.4
43.0
42.1
41.5

40.7
40.0
39.3
38.5
37.9

37.5
36.6
36.0
35.2
34.5

33.8
33.1
32.4
32.0
31.1

30.4
29.7
29.0
28.1
27.4

26.7
26.0
25.3
24.6
23.9

23.5
22.6
21.9
21.2
20.5

19.8
19.1
18.4
18.0
17.1

16.4
15.7
15.0
 3000 kg
10mmBall
Steel*






739
722
705
688
670

654
634
615
595
577

560
543
525
500
487

475
464
451
442
432

421
409
400
390
381

371
362
353
344
336

327
319
311
301
294

286
279
271
264
258

253
247
240
234
228

222
216
210
205
200

195
190
185
180
176

172
169
165
162
159

156
153
150
147
144

141
139
137
135
132

130
127
125
123
121

119
117
116
114
112

110
108
107
106
104

102
101
99

































































 500 kg
10mmBall
Steel
























































201
195
189

184
179
175
171
167

163
160
157
154
151

148
145
142
140
137

135
133
130
128
126

124
122
120
118
116

114
112
110
109
107

106
104
102
101
99

98
96
95
94
92

91
90
89
87
86

85
84
83
82
81

80
79
79
78
77

76
75
74
74
73

72
71
71
70
69

68
68
67
66
66

65
65
64
64
63

63
62
62
61
61

60
60
59
59
58

58
57
57
56
56

56
55
55
55
54

54
53
53
 136°
Diamond
Pyramid
1076
1044
940
900
865

832
800
772
746
720

697
674
653
633
613

595
577
560
544
528

513
498
484
471
458

446
434
423
412
402

392
382
372
363
354

345
336
327
318
310

302
294
286
279
272

266
260
254
248
243

238
230
222
213
208

204
196
192
188
184

180
176
173
170
166

163
160
































































































 
Sclero-
scope
101
99
97
95
92

91
88
87
85
83

81
80
78
76
75

74
72
71
69
68

67
66
64
63
62

60
58
57
56
55

54
52
51
50
49

48
47
46
44
43

42
41
41
40
39

38
37
36
35
35

34
33
32
31
30

29
28
27
26
26

26
25
25
25
24

24
24
































































































  














320,000
310,000
300,000
290,000
282,000

274,000
266,000
257,000
245,000
239,000

233,000
227,000
221,000
217,000
212,000

206,000
200,000
196,000
191,000
187,000

182,000
177,000
173,000
169,000
165,000

160,000
156,000
152,000
147,000
144,000

140,000
137,000
133,000
129,000
126,000

124,000
121,000
118,000
115,000
112,000

109,000
106,000
103,000
100,000
98,000

96,000
93,000
91,000
88,000
86,000

84,000
83,000
81,000
79,000
78,000

76,000
75,000
73,000































































































*Brinell hardness values above 500 are listed for a 10mm carbide ball instead of a steel ball.
Hardness values in italics are beyond the normal range of that scale and are listed for reference only.
Hardness conversions and tensile strength are approximate.
Tensile-strength conversions are for steel only.

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