Hardness Conversion


BRINELL ROCKWELL
3000 kgm Load Hardness 150 kgm C Scale 100 kgm B Scale 60 kgm A Scale
- 80   92.0
- 79   91.5
- 78   91.0
- 77   90.5
- 76   90.0
- 75   89.5
- 74   89.0
- 73   88.5
- 72   88.0
- 71   87.0
- 70   86.5
- 69   86.0
- 68   85.5
- 67   85.0
- 66   84.5
739 65   84.0
722 64   83.5
706 63   83.0
688 62   82.5
670 61   81.5
654 60   81.0
634 59   80.5
615 58   80.0
595 57   79.5
577 56   79.0
560 55   78.5
543 54   78.0
525 53   78.0
512 52   77.5
496 51   77.0
481 50   76.5
469 49   76.0
455 48   75.5
443 47   75.0
432 46   74.5
421 45   74.0
409 44   73.5
400 43   73.0
390 42   72.5
381 41   72.0
371 40   71.5
362 39   71.0
353 38   70.5
344 37   70.0
336 36 109* 69.5
327 35 109* 69.0
319 34 108* 68.5
311 33 108* 68.0
301 32 107* 67.5
394 31 106* 67.0
286 30 106* 66.5
279 29 105* 65.5
271 28 104* 65.0
264 27 103* 64.5
258 26 103* 64.0
253 25 102* 63.3
247 24 101* 62.8
243 23 100* 62.4
237 22 100* 62.0
231 21 99* 61.5
226 20 98* 61.0
BRINELL ROCKWELL
3000 kgm Load Hardness 150 kgm C Scale 100 kgm B Scale 60 kgm A Scale
240 22** 100 61.5
234 21** 99 60.9
228 20** 98 60.2
222 19** 97 59.5
217 18** 96 58.9
210   95 58.0
205   94 57.5
200   93 57.0
195   92 56.5
190   91 56.0
185   90 55.5
180   89 55.0
176   88 54.0
172   87 53.5
169   86 53.0
165   85 52.5
162   84 52.0
159   83 51.0
156   82 50.5
153   81 50.0
150   80 49.5
147   79 49.0
144   78 48.5
141   77 48.0
139   76 47.0
137   75 46.5
135   74 46.0
132   73 45.5
130   72 45.0
127   71 44.5
125   70 44.0
123   69 43.5
121   68 43.0
119   67 42.5
117   66 42.0
116   65 -
114   64 41.5
112   63 41.0
110   62 40.5
108   61 40.0
107   60 39.5
106   59 39.0
104   58 38.5
103   57 38.0
101   56 -
100   55 37.5
-   54 37.0
-   53 36.5
-   52 36.0
-   51 35.5
-   50 35.0
-   53 36.5
-   52 36.0
-   51 35.5
    50 35.0
3000 kgm Load Hardness 150 kgm C Scale 100 kgm B Scale 60 kgm A Scale
BRINELL ROCKWELL
* Rockwell "B" values not ordinarily determined on hardened steel & hard alloys.
** Rockwell "C" values not ordinarily determined on soft steel, gray iron & most non-ferrous metals

Based on Wilson Instruments Chart, 1995

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