The Hardness Conversion Table is intended as a guide only. It is applicable to fasteners that are manufactured from Carbon Steel, Cast Steel  Low Alloy Steels

Hardness Conversion Chart
Brinell (HB) Rockwell C (HRC) Vickers (HV) Rockwell B (HRB)
50 513
425 46 452
403 44 427
382 42 404
363 40 382
346 38 362
329 36 344
313 34 326
298 32 1309
275 28.5 285
258 25.5 266
241 22.5 248 100
228 20 234 98
215 220 96
204 209 94
194 198 92
184 188 90
176 179 88
168 171 86
161 164 84
155 157 82
149 151 80
144 145 78
139 140 76
134 135 74
129 130 72
125 126 70
121 122 68
118 119 66
114 115 64
111 112 62
108 108 60
106 106 58
103 103 56
100 100 54
98 98 52
95 95 50
93 93 48
91 91 46
89 89 44
87 87 42
85 85 40
83 83 38
81 81 36

 

The Vickers testing method is extensively used in the fastener industry because it is applicable over a wide hardness range and is the preferred method according to ISO 898-1, Rockwell C is used for hard steels, Rockwell B is for soft steels, copper etc

All information is strictly informative