Operating Instructions & Parts Manual
Page 10
ASTM Hardness Conversion Chart
Rockwell B Hardness Range
Approximate Hardness Conversion Numbers for Non-Austenitic Steels,
according to ASTM E-140.The conversion values contained herein should be
considered approximate only and may be inaccurate for specific applications.
Rockwell Superficial
Rockwell Vickers Knoop Brinell Tensile
Brinelll
B
A
E 15T 30T 45T
Hardness Hardness
Hardness
Strength
Hardness
100kgf
60 kgf
100 kgf
15 kgf
30 kgf
45 kg f
500gf
3000 kgf
1000 lbs/ 500 kgf
1/16"ball
diamond
1/8" ball
1/16" ball 1/16"ball 1/16" ball
and over
10mm ball
square in 10mm ball
100 61.5 93.1 83.1 72.9 240 261 240 116 201
99 60.9 82.8 82.5 71.9 234 246 234 114 195
98 602 92.5 81.8 709 228 241 228 109 189
97 59.5 92.1 81.1 699 222 236 222 105 184
96 58.9 91.8 80.4 689 216 231 216 102 179
95 58.3 91.5 79.8 67.9 210 226 210 100 175
94 57.6 91.2 79.1 669 205 221 205 98 171
93 57
90.8 784 659 200 216 200 94 167
92 56.4 90.5 77.8 64.8 195 211 195
92 163
91 55.8 90.2 77.1 63.8 190 206 190
90 160
90 55.2 89.9 76.4 62.8 186 201 186
89 157
89 54.6 89.5 76.8 61.8 180 196 180
88 164
88 64.0 89.2 75.1 60.8 176 192 176
86 151
87 53.4 88.9 74.4 59.8 172 188 172
84 148
86 52.8 88.6 73.8 58.8 169 184 169
83 145
85 52.3 88.2 73.1 57.8 165 180 165
82 142
84 51.7 87.9 72.4 56.8 162 176 162
81 140
83 51.1 87.6 71.8 55.8 159 173 159
80 137
82 50.6 87.3 71.1 54.8 156 170 156
76 135
81 50
86.9 70.4 53.8 153 167 153
73 133
80 49.5 86.6 69.7 52.8 150 164 150
72 130
79 48.9 86.3 69.1 51.8 147 161 147
70 128
78 48.4 86.0 68.4 50.8 144 158 144
69 126
77 47.9 85.6 67.7 49.8 141 155 141
68 124
76 47.3 85.3 67.1 48.8 139 152 139
67 122
75 46.8 86.0 66.4 47.8 137 150 137
66 120
74 46.3
84.7 65.7 46.8 135 147 135
66 118
73 45.8
84.3 65.1 45.8 132 145 132
64 116
72 45.3
84.0 64.4 44.8 130 143 130
63 114
71 44.8 100 83.7 63.7 43.8 127 141 127
62 112
70 44.3 99.5 83.4 63.1 42.8 125 139 125
61 110
69 43.8 99.0 83.0 62.4 41.8 123 137 123
60 109
68 43.3 98.0 82.7 61.7 40.8 121 135 121
59 108
67 42.8 97.5 82.4 61 39.8 119 133 119 58 106
66 42.3 97.0 82.1 60.4 38.7 117 131 117
57 104
65 41.8 96.0 81.8 59.7 37.7 116 129 116
56 102
64 41.4 95.5 81.4 59 36.7 114 127 114
100
63 40.9 95.0 81.1 58.4 35.7 112 125 112
99
62 40.4 94.5 80.8 57.7 34.7 110 124 110
98
61 40.0 93.5 80.5 57.0 33.7 108 122 108
96
60 39.5 93.0 80.1 56.4 32.7 107 120 107
95
59 39.0 92.5 79.8 55.7 31.7 106 118 106
94
58 38.6 92.0 79.5 55 30.7 104 117 104
92
57 38.1 91.0 79.2 54.4 2.97 103 115 103
91
56 37.7 90.6 78.8 53.7 28.7 101 114 101
90
55 37.2 90.0 78.6 53.0 27.7 100 112 100
89
54 36.8 89.5 78.2 52.4 26.7
111
87
53 36.3 89.0 77.9 51.7 26.7
110
86
52 35.9 88.0 77.5 51.0 24.7
109
85
51 35.5 87.6 77.2 50.3 23.7
108
84
50 35.0 87.0 76.9 49.7 22.7
107
83
