Tech Support
17
Macro
Vickers
Model
No.
900
‐
398
Hardness
Tester
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
