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Brass

Approximate Hardness Conversion No.s for
Cartridge Brass (70&perc Cu 30% Zn Alloy)

Vicker’s Hardness Number (HV)	Rockwell Hardness Number B Scale, 100 Kgf (HRB)	Rockwell Hardness Number F Scale, 600 Kgf (HRF)	Rockwell Superficial Hardness No. 15T Scale, 15 Kgf (15T)	Rockwell Superficial Hardness No. 30T Scale, 30 Kgf (30T)	Rockwell Superficial Hardness No. 45T Scale, 45 Kgf (45T)	Brinell Hardness No. 10mm Standard Ball, 500 Kgf (HBS)
196	93.5	110	90	77.5	66	169
194	…	109.5	…	…	65.5	167
192	93	…	…	777	65	166
190	92.5	109	…	76.5	64.5	164
188	92	…	89.5	…	64	162
186	91.5	108.5	…	76	63.5	161
184	91	…	…	75.5	63	159
182	90.5	108	89	…	62.5	157
180	90	107.5	…	75	62	156
178	89	…	…	74.5	61.5	154
176	88.5	107	…	…	61	152
174	88	…	88.5	74	60.5	150
172	87.5	106.5	…	73.5	60	149
170	87	…	…	…	59.5	147
168	86	106	88	73	59	146
166	85.5	…	…	72.5	58.5	144
164	85	105.5	…	72	58	142
162	84	105	87.5	…	57.5	141
160	83.5	…	…	71.5	56.5	139
158	83	104.5	…	71	56	138
156	82	104	87	70.5	55.5	136
154	81.5	103.5	…	70	54.5	135
152	80.5	103	…	…	54	133
150	80	…	86.5	69.5	53.5	131
148	79	102.5	…	69	53	129
146	78	102	…	68.5	52.5	128
144	77.5	101.5	86	68	51.5	126
142	77	101	…	67.5	51	124
140	76	100.5	85.5	67	50	122
138	75	100	…	66.5	49	121
136	74.5	99.5	85	66	48	120
134	73.5	99	…	65.5	47.5	118
132	73	98.5	84.5	65	46.5	116
130	72	98	84	64.5	45.5	114
128	71	97.5	…	63.5	45	113
126	70	97	83.5	63	44	112
124	69	96.5	…	62.5	43	110
122	68	96	83	62	42	108
120	67	95.5	…	61	41	106
118	66	95	82.5	60.5	40	105