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Hardness Conversion Chart

Comparison of Hardnesses standards including Brinell, Rockwell B scale, Rockwell C scale, Vickers and others.

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Brinell Hardness	Rockwell B Scale	Rockwell C Scale	Vickers Hardness Number	Knoop Hardness	Rockwell A Scale	Rockwell F Scale	15T Scale	30T Scale	45T Scale	Approximate Tensile Strength
739	–	65	832	846	83.9	–	–	–	–	–
722	–	64	800	822	83.4	–	–	–	–	–
706	–	63	772	799	82.8	–	–	–	–	–
688	–	62	746	776	82.3	–	–	–	–	–
670	–	61	720	754	81.8	–	–	–	–	–
654	–	60	697	732	81.2	–	–	–	–	–
634	–	59	674	710	80.7	–	–	–	–	351
615	–	58	653	690	80.1	–	–	–	–	338
595	–	57	633	670	79.6	–	–	–	–	325
577	–	56	613	650	79.0	–	–	–	–	313
560	–	55	595	630	78.5	–	–	–	–	301
543	–	54	577	612	78.0	–	–	–	–	292
525	–	53	560	594	77.4	–	–	–	–	283
512	–	52	544	576	76.8	–	–	–	–	273
496	–	51	528	558	76.3	–	–	–	–	264
482	–	50	513	542	75.9	–	–	–	–	255
468	–	49	498	526	75.2	–	–	–	–	246
455	–	48	484	510	74.7	–	–	–	–	238
442	–	47	471	495	74.1	–	–	–	–	229
432	–	46	458	480	73.6	–	–	–	–	221
421	–	45	446	466	73.1	–	–	–	–	215
409	–	44	434	452	72.5	–	–	–	–	208
400	–	43	423	438	72.0	–	–	–	–	201
390	–	42	412	426	71.5	–	–	–	–	194
381	–	41	402	414	70.9	–	–	–	–	188
371	–	40	392	402	70.4	–	–	–	–	182
362	–	39	382	391	69.9	–	–	–	–	177
353	110	38	372	380	69.4	–	–	–	–	171
344	109.5	37	363	370	68.9	–	–	–	–	166
336	109	36	354	360	68.4	–	–	–	–	161
327	108.5	35	345	351	67.9	–	–	–	–	156
319	108	34	336	342	67.4	–	–	–	–	152
311	107.5	33	327	334	66.8	–	–	–	–	149
301	107	32	318	326	66.3	–	–	–	–	146
294	106	31	310	318	65.8	–	–	–	–	141
286	105.5	30	302	311	65.3	–	–	–	–	138
279	105	29	294	304	64.6	–	–	–	–	135
271	104.5	28	286	297	64.3	–	–	–	–	131
264	103.5	27	279	290	63.8	–	–	–	–	128
258	102.5	26	272	284	63.3	–	–	–	–	125
253	102	25	266	278	62.8	–	–	–	–	123
247	101	24	260	272	62.4	–	–	–	–	119
243	100.5	23	254	266	62.0	–	–	–	–	117
240	100	22.8	240	251	61.5	–	93.1	83.1	72.9	116
234	99	21.7	234	246	60.9	–	92.8	82.5	71.9	114
228	98	20.5	228	241	60.2	–	92.5	81.8	70.9	109
222	97	18.0	222	236	59.5	–	92.1	81.1	69.9	104
216	96	17.0	216	231	58.9	–	91.8	80.4	68.9	102
210	95	15.5	210	226	58.3	–	91.5	79.8	67.9	100
205	94	14.0	205	221	57.6	–	91.2	79.1	66.9	98
200	93	13.0	200	216	57.0	–	90.8	78.4	65.9	94
195	92	11.5	195	211	56.4	–	90.5	77.8	64.8	92
190	91	10.0	190	206	55.8	–	90.2	77.1	63.8	90
185	90	9.0	185	201	55.2	–	89.9	76.4	62.8	89
180	89	8.0	180	196	54.6	–	89.5	75.8	61.8	88
176	88	6.4	176	192	54.0	–	89.2	75.1	60.8	86
172	87	5.4	172	188	53.4	–	88.9	74.4	59.8	84
169	86	4.5	169	184	52.8	–	88.6	73.8	58.8	83
165	85	3.3	165	180	52.3	–	88.2	73.1	57.8	82
162	84	2.0	162	176	51.7	–	87.9	72.4	56.8	81
159	83	1.0	159	173	51.1	–	87.6	71.9	55.8	80
156	82		156	170	50.6	–	87.3	71.1	54.8	77
153	81		153	167	50.0	–	86.9	70.4	53.8	73
150	80		150	164	49.5	–	86.6	69.7	52.8	72
147	79		147	161	48.9	–	86.3	69.1	51.8	70
144	78		144	158	48.4	–	86.0	68.4	50.8	69
141	77		141	155	47.9	–	85.6	67.7	49.8	68
139	76		139	152	47.3	–	85.3	67.1	48.8	67
137	75		137	150	46.8	99.6	85.0	66.4	47.8	66
135	74		135	147	46.3	99.1	84.7	65.7	46.8	65
132	73		132	145	45.8	98.5	84.3	65.1	45.8	65
130	72		130	143	45.3	98.0	84.0	64.4	44.8	63
127	71		127	141	44.8	97.4	83.7	63.7	43.8	62
125	70		125	139	44.3	96.8	83.4	63.1	42.8	61
123	69		123	137	43.8	96.2	83.0	62.4	41.8	60
121	68		121	135	43.3	95.6	82.7	61.7	40.8	59
119	67		119	133	42.8	95.1	82.4	61.0	39.8	58
117	66		117	131	42.3	94.5	82.1	60.4	38.7	57
116	65		116	129	41.8	93.9	81.8	59.7	37.7	56
114	64		114	127	41.4	93.4	81.4	59.0	36.7
112	63		112	125	40.9	92.8	81.1	58.4	35.7
110	62		110	124	40.4	92.2	80.8	57.7	34.7
108	61		108	122	40.0	91.7	80.5	57.0	33.7
107	60		107	120	39.5	91.1	80.1	56.4	32.7
106	59		106	118	39.0	90.5	79.8	55.7	31.7
104	58		104	117	38.6	90.0	79.5	55.0	30.7
103	57		103	115	38.1	89.4	79.2	54.4	29.7
101	56		101	114	37.7	88.8	78.8	53.7	28.7
100	55		100	112	37.2	88.2	78.5	53.0	27.7
	54			111	36.8	87.7	78.2	52.4	26.7
	53			110	36.3	86.5	77.9	51.7	25.7
	52			109	35.9	86.0	77.5	51.0	24.7
	51			108	35.5	85.4	77.2	50.3	23.7
	50			107	35.0	84.8	76.9	49.7	22.7
	49			106	34.6	84.3	76.6	49.0	21.7
	48			105	34.1	83.7	76.2	48.3	20.7
	47			104	33.7	83.1	75.9	47.7	19.7
	46			103	33.3		75.6	47.0	18.7