Hardness Conversion Chart | Southern Fasteners

Approximate equivalent hardness numbers for carbon and alloy steels.


ROCKWELL						ROCKWELL SUPERFICIAL				Brinell		Vickers	Shore
A	B	C	D	E	F	15-N	30-N	45-N	30-T	3000 kg	500 kg		Sciero
60kg Brale	100kg Ball	150kg Brale	100kg Brale	100kg Ball	60kg Ball	15kg Brale	30kg Brale	45kg Brale	30 kg Ball	Ball Steel	Ball Steel		-scope
	1/16″			1/8″	1/16″				1/16″	10mm	10mm
86.5	–	70	78.5	–	–	94	86	77.6	–	–	–	1076	101
86	–	69	77.7	–	–	93.5	85	76.5	–	–	–	1044	99
85.6	–	68	76.9	–	–	93.2	84.4	75.4	–	–	–	940	97
85	–	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	–	739	–	832	91
83.4	–	64	73.8	–	–	91.8	81.1	71	–	722	–	800	88
82.8	–	63	73	–	–	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	–	56	67.7	–	–	88.3	73.9	62	–	577	–	613	75
78.5	120	55	66.9	–	–	87.9	73	60.9	–	560	–	595	74
78	120	54	66.1	–	–	87.4	72	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	–	475	–	513	67
75.2	117	49	62.1	–	–	85	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	–	–	83.5	64.8	50.3	–	432	–	458	62
73.1	115	45	59.2	–	–	83	64	49	–	421	–	446	60
72.5	114	44	58.5	–	–	82.5	63.1	47.8	–	409	–	434	58
72	113	43	57.7	–	–	82	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	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	–	–	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	50.4	31.3	–	286	–	302	42
64.7	104	29	47	–	–	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	24.3	–	247	–	260	37
62	100	23	42.1	–	–	71	44	23.1	82	240	201	254	36
61.5	99	22	41.6	–	–	70.5	43.2	22	81.5	234	195	248	35
61	98	21	40.9	–	–	69.9	42.3	20.7	81	228	189	243	35
60.5	97	20	40.1	–	–	69.4	41.5	19.6	80.5	222	184	238	34
59	96	18	–	–	–	–	–	–	80	216	179	230	33
58	95	16	–	–	–	–	–	–	79	210	175	222	32
57.5	94	15	–	–	–	–	–	–	78.5	205	171	213	31
57	93	13	–	–	–	–	–	–	78	200	167	208	30
56.5	92	12	–	–	–	–	–	–	77.5	195	163	204	29
56	91	10	–	–	–	–	–	–	77	190	160	196	28
55.5	90	9	–	–	–	–	–	–	76	185	157	192	27
55	89	8	–	–	–	–	–	–	75.5	180	154	188	26
54	88	7	–	–	–	–	–	–	75	176	151	184	26
53.5	87	6	–	–	–	–	–	–	74.5	172	148	180	26
53	86	5	–	–	–	–	–	–	74	169	145	176	25
52.5	85	4	–	–	–	–	–	–	73.5	165	142	173	25
52	84	3	–	–	–	–	–	–	73	162	140	170	25
51	83	2	–	–	–	–	–	–	72	159	137	166	24
50.5	82	1	–	–	–	–	–	–	71.5	156	135	163	24
50	81	0	–	–	–	–	–	–	71	153	133	160	24
49.5	80	–	–	–	–	–	–	–	70	150	130	–	–
49	79	–	–	–	–	–	–	–	69.5	147	128	–	–
48.5	78	–	–	–	–	–	–	–	69	144	126	–	–
48	77	–	–	–	–	–	–	–	68	141	124	–	–
47	76	–	–	–	–	–	–	–	67.5	139	122	–	–
46.5	75	–	–	–	99.5	–	–	–	67	137	120	–	–
46	74	–	–	–	99	–	–	–	66	135	118	–	–
45.5	73	–	–	–	98.5	–	–	–	65.5	132	116	–	–
45	72	–	–	–	98	–	–	–	65	130	114	–	–
44.5	71	–	–	100	97.5	–	–	–	64.2	127	112	–	–
44	70	–	–	99.5	97	–	–	–	63.5	125	110	–	–
43.5	69	–	–	99	96	–	–	–	62.8	123	109	–	–
43	68	–	–	98	95.5	–	–	–	62	121	107	–	–
42.5	67	–	–	97.5	95	–	–	–	61.4	119	106	–	–
42	66	–	–	97	94.5	–	–	–	60.5	117	104	–	–
41.8	65	–	–	96	94	–	–	–	60.1	116	102	–	–
41.5	64	–	–	95.5	93.5	–	–	–	59.5	114	101	–	–
41	63	–	–	95	93	–	–	–	58.7	112	99	–	–
40.5	62	–	–	94.5	92	–	–	–	58	110	98	–	–
40	61	–	–	93.5	91.5	–	–	–	57.3	108	96	–	–
39.5	60	–	–	93	91	–	–	–	56.5	107	95	–	–
39	59	–	–	92.5	90.5	–	–	–	55.9	106	94	–	–
38.5	58	–	–	92	90	–	–	–	55	104	92	–	–
38	57	–	–	91	89.5	–	–	–	54.6	102	91	–	–
37.8	56	–	–	90.5	89	–	–	–	54	101	90	–	–
37.5	55	–	–	90	88	–	–	–	53.2	99	89	–	–
37	54	–	–	89.5	87.5	–	–	–	52.5	–	87	–	–
36.5	53	–	–	89	87	–	–	–	51.8	–	86	–	–
36	52	–	–	88	86.5	–	–	–	51	–	85	–	–
35.5	51	–	–	87.5	86	–	–	–	50.4	–	84	–	–
35	50	–	–	87	85.5	–	–	–	49.5	–	83	–	–
34.8	49	–	–	86.5	85	–	–	–	49.1	–	82	–	–
34.5	48	–	–	85.5	84.5	–	–	–	48.5	–	81	–	–
34	47	–	–	85	84	–	–	–	47.7	–	80	–	–
33.5	46	–	–	84.5	83	–	–	–	47	–	79	–	–
33	45	–	–	84	82.5	–	–	–	46.2	–	79	–	–
32.5	44	–	–	83.5	82	–	–	–	45.5	–	78	–	–
32	43	–	–	82.5	81.5	–	–	–	44.8	–	77	–	–
31.5	42	–	–	82	81	–	–	–	44	–	76	–	–
31	41	–	–	81.5	80.5	–	–	–	43.4	–	75	–	–
30.8	40	–	–	81	79.5	–	–	–	43	–	74	–	–
30.5	39	–	–	80	79	–	–	–	42.1	–	74	–	–
30	38	–	–	79.5	78.5	–	–	–	41.5	–	73	–	–
29.5	37	–	–	79	78	–	–	–	40.7	–	72	–	–
29	36	–	–	78.5	77.5	–	–	–	40	–	71	–	–
28.5	35	–	–	78	77	–	–	–	39.3	–	71	–	–
28	34	–	–	77	76.5	–	–	–	38.5	–	70	–	–
27.8	33	–	–	76.5	75.5	–	–	–	37.9	–	69	–	–
27.5	32	–	–	76	75	–	–	–	37.5	–	68	–	–
27	31	–	–	75.5	74.5	–	–	–	36.6	–	68	–	–
26.5	30	–	–	75	74	–	–	–	36	–	67	–	–
26	29	–	–	74	73.5	–	–	–	35.2	–	66	–	–
25.5	28	–	–	73.5	73	–	–	–	34.5	–	66	–	–
25	27	–	–	73	72.5	–	–	–	33.8	–	65	–	–
24.5	26	–	–	72.5	72	–	–	–	33.1	–	65	–	–
24.2	25	–	–	72	71	–	–	–	32.4	–	64	–	–
24	24	–	–	71	70.5	–	–	–	32	–	64	–	–
23.5	23	–	–	70.5	70	–	–	–	31.1	–	63	–	–
23	22	–	–	70	69.5	–	–	–	30.4	–	63	–	–
22.5	21	–	–	69.5	69	–	–	–	29.7	–	62	–	–
22	20	–	–	68.5	68.5	–	–	–	29	–	62	–	–
21.5	19	–	–	68	68	–	–	–	28.1	–	61	–	–
21.2	18	–	–	67.5	67	–	–	–	27.4	–	61	–	–
21	17	–	–	67	66.5	–	–	–	26.7	–	60	–	–
20.5	16	–	–	66.5	66	–	–	–	26	–	60	–	–
20	15	–	–	65.5	65.5	–	–	–	25.3	–	59	–	–
–	14	–	–	65	65	–	–	–	24.6	–	59	–	–
–	13	–	–	64.5	64.5	–	–	–	23.9	–	58	–	–
–	12	–	–	64	64	–	–	–	23.5	–	58	–	–
–	11	–	–	63.5	63.5	–	–	–	22.6	–	57	–	–
–	10	–	–	62.5	63	–	–	–	21.9	–	57	–	–
–	9	–	–	62	62	–	–	–	21.2	–	56	–	–
–	8	–	–	61.5	61.5	–	–	–	20.5	–	56	–	–
–	7	–	–	61	61	–	–	–	19.8	–	56	–	–
–	6	–	–	60.5	60.5	–	–	–	19.1	–	55	–	–
–	5	–	–	60	60	–	–	–	18.4	–	55	–	–
–	4	–	–	59	59.5	–	–	–	18	–	55	–	–
–	3	–	–	58.5	59	–	–	–	17.1	–	54	–	–
–	2	–	–	58	58	–	–	–	16.4	–	54	–	–
–	1	–	–	57.5	57.5	–	–	–	15.7	–	53	–	–
–	0	–	–	57	57	–	–	–	15	–	53	–	–