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Hardness Conversion Tables
Based on Brinell (Approximate)
BRINELL HARDNESS		ROCKWELL HARDNESS				Diamond Pyramid Hardness Number (Vickers)	Approx. Tensile Strength 1000 psi
Diameter mm 3000 Kg	Tungsten Carbide 10 mm Ball	A-Scale 60 Kg Brale	B-Scale 100 Kg 1/16" Ball	C-Scale 150 Kg Brale	Superficial 30N
—	—	86.5	—	70.0	86.0	1076	—
—	—	86.0	—	69.0	85.0	1004	—
—	—	85.6	—	68.0	84.4	940	—
—	—	85.0	—	67.0	83.6	900	—
—	757	84.4	—	65.9	82.7	860	—
2.25	745	84.1	—	65.3	82.2	840	—
—	722	83.4	—	64.0	81.1	800	—
—	710	83.0	—	63.3	80.4	780	—
2.35	682	83.2	—	61.7	79.0	737	—
2.40	653	81.2	—	60.0	77.5	697	—
2.45	627	80.5	—	58.7	76.3	667	323
2.50	601	79.8	—	57.3	75.1	640	309
2.55	578	79.1	—	56.0	73.9	615	297
2.60	555	78.4	—	54.7	72.7	591	285
2.65	534	77.8	—	53.5	71.6	569	274
2.70	514	76.9	—	52.1	70.3	547	263
2.75	495	76.3	—	51.0	69.4	528	253
2.80	477	75.6	—	49.6	68.2	508	243
2.85	461	74.9	—	48.5	67.2	491	235
2.90	444	74.2	—	47.1	65.8	472	225
2.95	429	73.4	—	45.7	64.6	455	217
3.00	415	72.8	—	44.5	63.5	440	210
3.05	401	72.0	—	43.1	62.3	425	202
3.10	388	71.4	—	41.8	61.1	410	195
3.15	375	70.6	—	40.4	59.9	396	188
3.20	363	70.0	—	39.1	58.7	383	182
3.25	352	69.3	(110.0)	37.9	57.6	372	176
3.30	341	68.7	(109.0)	36.6	56.4	360	170
3.35	331	68.1	(108.5)	35.5	55.4	350	166
3.40	321	67.5	(108.0)	34.3	54.3	339	160
3.45	311	66.9	(107.5)	33.1	53.3	328	155
3.50	302	66.3	(107.0)	32.1	52.2	319	150
3.55	293	65.7	(106.0)	30.9	51.2	309	145
3.60	285	65.3	(105.5)	29.9	50.3	301	141
3.65	277	64.6	(104.5)	28.8	49.3	292	137
3.70	269	64.1	(104.0)	27.6	48.3	284	133
3.75	262	63.6	(103.0)	26.6	47.3	276	129
3.80	255	63.0	(102.0)	25.4	46.2	269	126
3.85	248	62.5	(101.0)	24.2	45.1	261	122
3.90	241	61.8	100.0	22.8	43.9	253	118
3.95	235	61.4	99.0	21.7	42.9	247	115
4.00	229	60.8	98.2	20.5	41.9	241	111
4.05	223	59.7	97.3	(18.8)	—	234	—
4.10	217	59.2	96.4	(17.5)	—	228	105
4.15	212	58.5	95.5	(16.0)	—	222	102
4.20	207	57.8	94.6	(15.2)	—	218	100
4.25	201	57.4	93.8	(13.8)	—	212	98
4.30	197	56.9	92.8	(12.7)	—	207	95
4.35	192	56.5	91.9	(11.5)	—	202	93
4.40	187	55.9	90.7	(10.0)	—	196	90
4.45	183	55.5	90.0	(9.0)	—	192	89
4.50	179	55.0	89.0	(8.0)	—	188	87
4.55	174	53.9	87.8	(6.4)	—	182	85
4.60	170	53.4	86.8	(5.4)	—	178	83
4.65	167	53.0	86.0	(4.4)	—	175	81
4.70	163	52.5	85.0	(3.3)	—	171	79
4.80	156	51.0	82.9	(.9)	—	163	76
4.90	149	49.9	80.8	—	—	156	73
5.00	143	48.9	78.7	—	—	150	71
5.10	137	47.4	76.4	—	—	143	67
5.20	131	46.0	74.0	—	—	137	65
5.30	126	45.0	72.0	—	—	132	63
5.40	121	43.9	69.8	—	—	127	60
5.50	116	42.8	67.6	—	—	122	58
5.60	111	41.9	65.7	—	—	117	56

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