BUEHLER®

Load 50gf (0.05kgf)
Diagonal Knoop Hardness Number
(µm) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
63 179 179 178 178 177 176 176 175 175 174
64 174 173 173 172 172 171 170 170 169 169
65 168 168 167 167 166 166 165 165 164 164
66 163 163 162 162 161 161 160 160 159 159
67 158 158 158 157 157 156 156 155 155 154
68 154 153 153 153 152 152 151 151 150 150
69 149 149 149 148 148 147 147 146 146 146
70 145 145 144 144 144 143 143 142 142 142
71 141 141 140 140 140 139 139 138 138 138
72 137 137 136 136 136 135 135 135 134 134
73 134 133 133 132 132 132 131 131 131 130
74 130 130 129 129 129 128 128 128 127 127
75 126 126 126 125 125 125 124 124 124 124
76 123 123 123 122 122 122 121 121 121 120
77 120 120 119 119 119 118 118 118 118 117
78 117 117 116 116 116 115 115 115 115 114
79 114 114 113 113 113 113 112 112 112 111
80 111 111 111 110 110 110 110 109 109 109
81 108 108 108 108 107 107 107 107 106 106
82 106 106 105 105 105 105 104 104 104 104
83 103 103 103 103 102 102 102 102 101 101
84 101 101 100 100 99.9 99.6 99.4 99.2 98.9 98.7
85 98.5 98.2 98.0 97.8 97.6 97.3 97.1 96.9 96.6 96.4
86 96.2 96.0 95.8 95.5 95.3 95.1 94.9 94.7 94.4 94.2
87 94.0 93.8 93.6 93.4 93.1 92.9 92.7 92.5 92.3 92.1
88 91.9 91.7 91.5 91.3 91.0 90.8 90.6 90.4 90.2 90.0
89 89.8 89.6 89.4 89.2 89.0 88.8 88.6 88.4 88.2 88.0
90 87.8 87.6 87.5 87.3 87.1 86.9 86.7 86.5 86.3 86.1
91 85.9 85.7 85.5 85.4 85.2 85.0 84.8 84.6 84.4 84.2
92 84.1 83.9 83.7 83.5 83.3 83.2 83.0 82.8 82.6 82.4
93 82.3 82.1 81.9 81.7 81.6 81.4 81.2 81.0 80.9 80.7
94 80.5 80.4 80.2 80.0 79.8 79.7 79.5 79.3 79.2 79.0
95 78.8 78.7 78.5 78.3 78.2 78.0 77.9 77.7 77.5 77.4
96 77.2 77.0 76.9 76.7 76.6 76.4 76.2 76.1 75.9 75.8
97 75.6 75.5 75.3 75.2 75.0 74.8 74.7 74.5 74.4 74.2
98 74.1 73.9 73.8 73.6 73.5 73.3 73.2 73.0 72.9 72.7
99 72.6 72.4 72.3 72.2 72.0 71.9 71.7 71.6 71.4 71.3
100 71.2 71.0 70.9 70.7 70.6 70.4 70.3 70.2 70.0 69.9
101 69.7 69.6 69.5 69.3 69.2 69.1 68.9 68.8 68.7 68.5
102 68.4 68.3 68.1 68.0 67.9 67.7 67.6 67.5 67.3 67.2
103 67.1 66.9 66.8 66.7 66.5 66.4 66.3 66.2 66.0 65.9
104 65.8 65.7 65.5 65.4 65.3 65.2 65.0 64.9 64.8 64.7
105 64.5 64.4 64.3 64.2 64.0 63.9 63.8 63.7 63.6 63.4
106 63.3 63.2 63.1 63.0 62.8 62.7 62.6 62.5 62.4 62.3
107 62.1 62.0 61.9 61.8 61.7 61.6 61.5 61.3 61.2 61.1
108 61.0 60.9 60.8 60.7 60.6 60.4 60.3 60.2 60.1 60.0
9