Brinell and Rockwell Hardness Conversion Chart | Rockwell, Rockwell Superficial, Brinell, Vickers, Shore Hardness Conversion Table

Brinell and Rockwell Hardness Conversion Table Chart

These Conversion Tables presents data in the Rockwell A, B, C, D, E and F hardness range on the relationship among Brinell hardness, Vickers hardness, Rockwell superficial, hardness, and Shore Scleroscope hardness of nonaustenitic steels including carbon, alloy, and tool steels in the as-forged, annealed, normalized, and quenched and tempered conditions provided that they are homogeneous.

For plain carbon steels, the approximate relationship between the hardness and tensile strength is:
Tensile strength = Bhn × 515 (for Brinell numbers up to 175)
Tensile strength = Bhn × 490 (for Brinell numbers larger than 175)

The above formulas give the tensile strength in pounds per square inch for steels. These approximate relationships between hardness and tensile strength do not apply to nonferrous metals, with the possible exception of certain aluminum alloys.

Brinell Hardness Testing Equation

Table A
Brinell Hardness to Rockwell Hardness Conversion Table

Brinell Hardness	Rockwell Hardness			Tensile Strength (Approximate) Psi
Tungsten Carbide Ball 3000 KG	A Scale 60KG	B Scale 100KG	C Scale 150KG	Tensile Strength (Approximate) Psi
-	85.6	-	68.0	-
-	85.3	-	67.5	-
-	85.0	-	67.0	-
767	84.7	-	66.4	-
757	84.4	-	65.9	-
745	84.1	-	65.3	-
733	83.8	-	64.7	-
722	83.4	-	64.0	-
712	-	-	-	-
710	83.0	-	63.3	-
698	82.6	-	62.5	-
684	82.2	-	61.8	-
682	82.2	-	61.7	-
670	81.8	-	61.0	-
656	81.3	-	60.1	-
653	81.2	-	60.0	-
647	81.1	-	59.7	-
638	80.8	-	59.2	329,000
630	80.6	-	58.8	324,000
627	80.5	-	58.7	323,000
601	79.8	-	57.3	309,000
578	79.1	-	56.0	297,000
555	78.4	-	54.7	285,000
534	77.8	-	53.5	274,000
514	76.9	-	52.1	263,000
495	76.3	-	51.0	253,000
477	75.6	-	49.6	243,000
461	74.9	-	48.5	235,000
444	74.2	-	47.1	225,000
429	73.4	-	45.7	217,000
415	72.8	-	44.5	210,000
401	72.0	-	43.1	202,000
388	71.4	-	41.8	195,000
375	70.6	-	40.4	188,000
363	70.0	-	39.1	182,000
352	69.3	-	37.9	176,000
341	68.7	-	36.6	170,000
331	68.1	-	35.5	166,000
321	67.5	-	34.3	160,000
311	66.9	-	33.1	155,000
302	66.3	-	32.1	150,000
293	65.7	-	30.9	145,000
285	65.3	-	29.9	141,000
277	64.6	-	28.8	137,000
269	64.1	-	27.6	133,000
262	63.6	-	26.6	129,000
255	63.0	-	25.4	126,000
248	62.5	-	24.2	122,000
241	61.8	100.0	22.8	118,000
235	61.4	99.0	21.7	115,000
229	60.8	98.2	20.5	111,000
223	-	97.3	20.0	-
217	-	96.4	18.0	105,000
212	-	95.5	17.0	102,000
207	-	94.6	16.0	100,000
201	-	93.8	15.0	98,000
197	-	92.8	-	95,000
192	-	91.9	-	93,000
187	-	90.7	-	90,000
183	-	90.0	-	89,000
179	-	89.0	-	87,000
174	-	87.8	-	85,000
170	-	86.8	-	83,000
167	-	86.0	-	81,000
163	-	85.0	-	79,000
156	-	82.9	-	76,000
149	-	80.8	-	73,000
143	-	78.7	-	71,000
137	-	76.4	-	67,000
131	-	74.0	-	65,000
126	-	72.0	-	63,000
121	-	69.8	-	60,000
116	-	67.6	-	58,000
111	-	65.7	-	56,000

Table B
Rockwell - Rockwell Superficial - Brinell - Vickers - Shore Hardness Conversion

Rockwell						Rockwell Superficial				Brinell		Vickers	Shore Hardness
A	B	C	D	E	F	15-N	30-N	45-N	30-T	3000 kg	500 kg	136	Shore Hardness
60kg Brale	100kg 1/16" Ball	150kg Brale	100kg Brale	100kg 1/8" Ball	60kg 1/16" Ball	15kg Brale	30kg Brale	45kg Brale	30 kg 1/16" Ball	10mm Ball Steel	10mm Ball Steel	Diamond Pyramid	Sciero-scope
86.5	---	70	78.5	---	---	94.0	86.0	77.6	---	---	---	1076	101
86.0	---	69	77.7	---	---	93.5	85.0	76.5	---	---	---	1044	99
85.6	---	68	76.9	---	---	93.2	84.4	75.4	---	---	---	940	97
85.0	---	67	76.1	---	---	92.9	83.6	74.2	---	---	---	900	95
84.5	---	66	75.4	---	---	92.5	82.8	73.2	---	---	---	865	92
83.9	---	65	74.5	---	---	92.2	81.9	72.0	---	739	---	832	91
83.4	---	64	73.8	---	---	91.8	81.1	71.0	---	722	---	800	88
82.8	---	63	73.0	---	---	91.4	80.1	69.9	---	705	---	772	87
82.3	---	62	72.2	---	---	91.1	79.3	68.8	---	688	---	746	85
81.8	---	61	71.5	---	---	90.7	78.4	67.7	---	670	---	720	83
81.2	---	60	70.7	---	---	90.2	77.5	66.6	---	654	---	697	81
80.7	---	59	69.9	---	---	89.8	76.6	65.5	---	634	---	674	80
80.1	---	58	69.2	---	---	89.3	75.7	64.3	---	615	---	653	78
79.6	---	57	68.5	---	---	88.9	74.8	63.2	---	595	---	633	76
79.0	---	56	67.7	---	---	88.3	73.9	62.0	---	577	---	613	75
78.5	120	55	66.9	---	---	87.9	73.0	60.9	---	560	---	595	74
78.0	120	54	66.1	---	---	87.4	72.0	59.8	---	543	---	577	72
77.4	119	53	65.4	---	---	86.9	71.2	58.6	---	525	---	560	71
76.8	119	52	64.6	---	---	86.4	70.2	57.4	---	500	---	544	69
76.3	118	51	63.8	---	---	85.9	69.4	56.1	---	487	---	528	68
75.9	117	50	63.1	---	---	85.5	68.5	55.0	---	475	---	513	67
75.2	117	49	62.1	---	---	85.0	67.6	53.8	---	464	---	498	66
74.7	116	48	61.4	---	---	84.5	66.7	52.5	---	451	---	484	64
74.1	116	47	60.8	---	---	83.9	65.8	51.4	---	442	---	471	63
73.6	115	46	60.0	---	---	83.5	64.8	50.3	---	432	---	458	62
73.1	115	45	59.2	---	---	83.0	64.0	49.0	---	421	---	446	60
72.5	114	44	58.5	---	---	82.5	63.1	47.8	---	409	---	434	58
72.0	113	43	57.7	---	---	82.0	62.2	46.7	---	400	---	423	57
71.5	113	42	56.9	---	---	81.5	61.3	45.5	---	390	---	412	56
70.9	112	41	56.2	---	---	80.9	60.4	44.3	---	381	---	402	55
70.4	112	40	55.4	---	---	80.4	59.5	43.1	---	371	---	392	54
69.9	111	39	54.6	---	---	79.9	58.6	41.9	---	362	---	382	52
69.4	110	38	53.8	---	---	79.4	57.7	40.8	---	353	---	372	51
68.9	110	37	53.1	---	---	78.8	56.8	39.6	---	344	---	363	50
68.4	109	36	52.3	---	---	78.3	55.9	38.4	---	336	---	354	49
67.9	109	35	51.5	---	---	77.7	55.0	37.2	---	327	---	345	48
67.4	108	34	50.8	---	---	77.2	54.2	36.1	---	319	---	336	47
66.8	108	33	50.0	---	---	76.6	53.3	34.9	---	311	---	327	46
66.3	107	32	49.2	---	---	76.1	52.1	33.7	---	301	---	318	44
65.8	106	31	48.4	---	---	75.6	51.3	32.5	---	294	---	310	43
65.3	105	30	47.7	---	---	75.0	50.4	31.3	---	286	---	302	42
64.7	104	29	47.0	---	---	74.5	49.5	30.1	---	279	---	294	41
64.3	104	28	46.1	---	---	73.9	48.6	28.9	---	271	---	286	41
63.8	103	27	45.2	---	---	73.3	47.7	27.8	---	264	---	279	40
63.3	103	26	44.6	---	---	72.8	46.8	26.7	---	258	---	272	39
62.8	102	25	43.8	---	---	72.2	45.9	25.5	---	253	---	266	38
62.4	101	24	43.1	---	---	71.6	45.0	24.3	---	247	---	260	37
62.0	100	23	42.1	---	---	71.0	44.0	23.1	82.0	240	201	254	36
61.5	99	22	41.6	---	---	70.5	43.2	22.0	81.5	234	195	248	35
61.0	98	21	40.9	---	---	69.9	42.3	20.7	81.0	228	189	243	35
60.5	97	20	40.1	---	---	69.4	41.5	19.6	80.5	222	184	238	34
59.0	96	18	---	---	---	---	---	---	80.0	216	179	230	33
58.0	95	16	---	---	---	---	---	---	79.0	210	175	222	32
57.5	94	15	---	---	---	---	---	---	78.5	205	171	213	31
57.0	93	13	---	---	---	---	---	---	78.0	200	167	208	30
56.5	92	12	---	---	---	---	---	---	77.5	195	163	204	29
56.0	91	10	---	---	---	---	---	---	77.0	190	160	196	28
55.5	90	9	---	---	---	---	---	---	76.0	185	157	192	27
55.0	89	8	---	---	---	---	---	---	75.5	180	154	188	26
54.0	88	7	---	---	---	---	---	---	75.0	176	151	184	26
53.5	87	6	---	---	---	---	---	---	74.5	172	148	180	26
53.0	86	5	---	---	---	---	---	---	74.0	169	145	176	25
52.5	85	4	---	---	---	---	---	---	73.5	165	142	173	25
52.0	84	3	---	---	---	---	---	---	73.0	162	140	170	25
51.0	83	2	---	---	---	---	---	---	72.0	159	137	166	24
50.5	82	1	---	---	---	---	---	---	71.5	156	135	163	24
50.0	81	0	---	---	---	---	---	---	71.0	153	133	160	24
49.5	80	---	---	---	---	---	---	---	70.0	150	130	---	---
49.0	79	---	---	---	---	---	---	---	69.5	147	128	---	---
48.5	78	---	---	---	---	---	---	---	69.0	144	126	---	---
48.0	77	---	---	---	---	---	---	---	68.0	141	124	---	---
47.0	76	---	---	---	---	---	---	---	67.5	139	122	---	---
46.5	75	---	---	---	99.5	---	---	---	67.0	137	120	---	---
46.0	74	---	---	---	99.0	---	---	---	66.0	135	118	---	---
45.5	73	---	---	---	98.5	---	---	---	65.5	132	116	---	---
45.0	72	---	---	---	98.0	---	---	---	65.0	130	114	---	---
44.5	71	---	---	100.0	97.5	---	---	---	64.2	127	112	---	---
44.0	70	---	---	99.5	97.0	---	---	---	63.5	125	110	---	---
43.5	69	---	---	99.0	96.0	---	---	---	62.8	123	109	---	---
43.0	68	---	---	98.0	95.5	---	---	---	62.0	121	107	---	---
42.5	67	---	---	97.5	95.0	---	---	---	61.4	119	106	---	---
42.0	66	---	---	97.0	94.5	---	---	---	60.5	117	104	---	---
41.8	65	---	---	96.0	94.0	---	---	---	60.1	116	102	---	---
41.5	64	---	---	95.5	93.5	---	---	---	59.5	114	101	---	---
41.0	63	---	---	95.0	93.0	---	---	---	58.7	112	99	---	---
40.5	62	---	---	94.5	92.0	---	---	---	58.0	110	98	---	---
40.0	61	---	---	93.5	91.5	---	---	---	57.3	108	96	---	---
39.5	60	---	---	93.0	91.0	---	---	---	56.5	107	95	---	---
39.0	59	---	---	92.5	90.5	---	---	---	55.9	106	94	---	---
38.5	58	---	---	92.0	90.0	---	---	---	55.0	104	92	---	---
38.0	57	---	---	91.0	89.5	---	---	---	54.6	102	91	---	---
37.8	56	---	---	90.5	89.0	---	---	---	54.0	101	90	---	---
37.5	55	---	---	90.0	88.0	---	---	---	53.2	99	89	---	---
37.0	54	---	---	89.5	87.5	---	---	---	52.5	---	87	---	---
36.5	53	---	---	89.0	87.0	---	---	---	51.8	---	86	---	---
36.0	52	---	---	88.0	86.5	---	---	---	51.0	---	85	---	---
35.5	51	---	---	87.5	86.0	---	---	---	50.4	---	84	---	---
35.0	50	---	---	87.0	85.5	---	---	---	49.5	---	83	---	---
34.8	49	---	---	86.5	85.0	---	---	---	49.1	---	82	---	---
34.5	48	---	---	85.5	84.5	---	---	---	48.5	---	81	---	---
34.0	47	---	---	85.0	84.0	---	---	---	47.7	---	80	---	---
33.5	46	---	---	84.5	83.0	---	---	---	47.0	---	79	---	---
33.0	45	---	---	84.0	82.5	---	---	---	46.2	---	79	---	---
32.5	44	---	---	83.5	82.0	---	---	---	45.5	---	78	---	---
32.0	43	---	---	82.5	81.5	---	---	---	44.8	---	77	---	---
31.5	42	---	---	82.0	81.0	---	---	---	44.0	---	76	---	---
31.0	41	---	---	81.5	80.5	---	---	---	43.4	---	75	---	---
30.8	40	---	---	81.0	79.5	---	---	---	43.0	---	74	---	---
30.5	39	---	---	80.0	79.0	---	---	---	42.1	---	74	---	---
30.0	38	---	---	79.5	78.5	---	---	---	41.5	---	73	---	---
29.5	37	---	---	79.0	78.0	---	---	---	40.7	---	72	---	---
29.0	36	---	---	78.5	77.5	---	---	---	40.0	---	71	---	---
28.5	35	---	---	78.0	77.0	---	---	---	39.3	---	71	---	---
28.0	34	---	---	77.0	76.5	---	---	---	38.5	---	70	---	---
27.8	33	---	---	76.5	75.5	---	---	---	37.9	---	69	---	---
27.5	32	---	---	76.0	75.0	---	---	---	37.5	---	68	---	---
27.0	31	---	---	75.5	74.5	---	---	---	36.6	---	68	---	---
26.5	30	---	---	75.0	74.0	---	---	---	36.0	---	67	---	---
26.0	29	---	---	74.0	73.5	---	---	---	35.2	---	66	---	---
25.5	28	---	---	73.5	73.0	---	---	---	34.5	---	66	---	---
25.0	27	---	---	73.0	72.5	---	---	---	33.8	---	65	---	---
24.5	26	---	---	72.5	72.0	---	---	---	33.1	---	65	---	---
24.2	25	---	---	72.0	71.0	---	---	---	32.4	---	64	---	---
24.0	24	---	---	71.0	70.5	---	---	---	32.0	---	64	---	---
23.5	23	---	---	70.5	70.0	---	---	---	31.1	---	63	---	---
23.0	22	---	---	70.0	69.5	---	---	---	30.4	---	63	---	---
22.5	21	---	---	69.5	69.0	---	---	---	29.7	---	62	---	---
22.0	20	---	---	68.5	68.5	---	---	---	29.0	---	62	---	---
21.5	19	---	---	68.0	68.0	---	---	---	28.1	---	61	---	---
21.2	18	---	---	67.5	67.0	---	---	---	27.4	---	61	---	---
21.0	17	---	---	67.0	66.5	---	---	---	26.7	---	60	---	---
20.5	16	---	---	66.5	66.0	---	---	---	26.0	---	60	---	---
20.0	15	---	---	65.5	65.5	---	---	---	25.3	---	59	---	---
---	14	---	---	65.0	65.0	---	---	---	24.6	---	59	---	---
---	13	---	---	64.5	64.5	---	---	---	23.9	---	58	---	---
---	12	---	---	64.0	64.0	---	---	---	23.5	---	58	---	---
---	11	---	---	63.5	63.5	---	---	---	22.6	---	57	---	---
---	10	---	---	62.5	63.0	---	---	---	21.9	---	57	---	---
---	9	---	---	62.0	62.0	---	---	---	21.2	---	56	---	---
---	8	---	---	61.5	61.5	---	---	---	20.5	---	56	---	---
---	7	---	---	61.0	61.0	---	---	---	19.8	---	56	---	---
---	6	---	---	60.5	60.5	---	---	---	19.1	---	55	---	---
---	5	---	---	60.0	60.0	---	---	---	18.4	---	55	---	---
---	4	---	---	59.0	59.5	---	---	---	18.0	---	55	---	---
---	3	---	---	58.5	59.0	---	---	---	17.1	---	54	---	---
---	2	---	---	58.0	58.0	---	---	---	16.4	---	54	---	---
---	1	---	---	57.5	57.5	---	---	---	15.7	---	53	---	---
---	0	---	---	57.0	57.0	---	---	---	15.0	---	53	---	---

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