Hardness Conversion Chart

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General Temper Conversions Chart for 7075 Material.

The 7075 Material is listed on the horizontal axis and the Starting Mill Temper on the vertical axis.

C Scale	A Scale	15-N Scale	KSI (PSI)	C Scale	A Scale	15-N Scale	KSI (PSI)	C Scale	A Scale	15-N Scale	KSI (PSI)
80	92	96.5	—	60	81.2	90.2	—	40	70.4	80.9	182
79	91.5	96.3	—	59	80.7	89.8	351	39	69.9	79.9	177
78	91	96	—	58	80.1	89.3	338	38	69.4	79.4	171
77	90.5	95.8	—	57	79.6	88.9	325	37	68.9	78.8	166
76	90	95.5	—	56	79	88.3	313	36	68.4	78.3	161
75	89.5	95.3	—	55	78.5	87.9	301	35	67.9	77.7	156
74	89	95	—	54	78	87.4	292	34	67.4	77.7	156
73	88.5	94.8	—	53	77.4	86.9	283	33	66.8	76.6	149
72	88	94.5	—	52	76.8	86.4	273	32	66.3	76.1	146
71	87	94.3	—	51	76.3	85.9	264	31	65.8	75.6	141
70	86.5	94	—	50	75.9	85.5	255	30	65.3	75	138
69	86	93.5	—	49	75.2	85	246	29	64.6	74.5	135
68	85.6	94	—	48	74.7	84.5	238	28	64.3	73.9	131
67	85	92.9	—	47	74.1	83.9	229	27	63.8	73.3	128
66	84.5	92.5	—	46	73.6	83.5	221	26	63.3	72.8	125
65	83.9	92.2	—	45	73.1	83	215	25	62.8	72.2	123
64	83.4	91.8	—	44	72.5	82.5	208	24	62.4	71.6	119
63	82.8	91.4	—	43	72	82	201	23	62	71	117
62	82.3	91.1	—	42	71.5	81.5	194	22	61.5	70.5	115
61	92	81.8	—	41	70.9	80.9	188	21	61	69.9	112
								20	60.5	69.4	110

C Scale	A Scale	15-N Scale	KSI (PSI)	C Scale	A Scale	15-N Scale	KSI (PSI)	C Scale	A Scale	15-N Scale	KSI (PSI)
80	92	96.5	—	60	81.2	90.2	—	40	70.4	80.9	182
79	91.5	96.3	—	59	80.7	89.8	351	39	69.9	79.9	177
78	91	96	—	58	80.1	89.3	338	38	69.4	79.4	171
77	90.5	95.8	—	57	79.6	88.9	325	37	68.9	78.8	166
76	90	95.5	—	56	79	88.3	313	36	68.4	78.3	161
75	89.5	95.3	—	55	78.5	87.9	301	35	67.9	77.7	156
74	89	95	—	54	78	87.4	292	34	67.4	77.7	156
73	88.5	94.8	—	53	77.4	86.9	283	33	66.8	76.6	149
72	88	94.5	—	52	76.8	86.4	273	32	66.3	76.1	146
71	87	94.3	—	51	76.3	85.9	264	31	65.8	75.6	141
70	86.5	94	—	50	75.9	85.5	255	30	65.3	75	138
69	86	93.5	—	49	75.2	85	246	29	64.6	74.5	135
68	85.6	94	—	48	74.7	84.5	238	28	64.3	73.9	131
67	85	92.9	—	47	74.1	83.9	229	27	63.8	73.3	128
66	84.5	92.5	—	46	73.6	83.5	221	26	63.3	72.8	125
65	83.9	92.2	—	45	73.1	83	215	25	62.8	72.2	123
64	83.4	91.8	—	44	72.5	82.5	208	24	62.4	71.6	119
63	82.8	91.4	—	43	72	82	201	23	62	71	117
62	82.3	91.1	—	42	71.5	81.5	194	22	61.5	70.5	115
61	92	81.8	—	41	70.9	80.9	188	21	61	69.9	112
								20	60.5	69.4	110

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