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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

Note : 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.

Hardness Conversion Chart

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