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Hardness Scale for Various Materials
November 21st, 2011
posted by AutoDrill
MATERIAL |
BRINELL HARDNESS |
Drilled Diameter With Suggested Feed Rate Below |
1/16″ |
1/8″ |
1/4″ |
1/2″ |
3/4″ |
1″ |
1-1/2″ |
2″ |
Aluminum |
99-101 |
.001 |
.003 |
.007 |
.012 |
.016 |
.020 |
.025 |
.030 |
Aluminum Bronze |
170-187 |
.001 |
.003 |
.004 |
.008 |
.010 |
.012 |
.015 |
.020 |
Balkelite |
– |
.002 |
.005 |
.006 |
.008 |
.010 |
.012 |
.015 |
.015 |
Brass |
192-202 |
.001 |
.003 |
.004 |
.008 |
.012 |
.018 |
.020 |
.022 |
Bronze, Common |
166-183 |
.001 |
.003 |
.004 |
.008 |
.012 |
.018 |
.020 |
.022 |
Bronze Phos.; 1/2 Hard |
187-202 |
.001 |
.003 |
.004 |
.008 |
.010 |
.012 |
.015 |
.020 |
Bronze Phos.; Soft |
149-163 |
.001 |
.003 |
.004 |
.008 |
.012 |
.018 |
.020 |
.022 |
Celluloid |
– |
.002 |
.004 |
.005 |
.006 |
.006 |
.008 |
.008 |
.010 |
Copper |
80-85 |
.001 |
.003 |
.004 |
.008 |
.010 |
.012 |
.015 |
.020 |
Copper Mang.; 30% Mn |
134 |
.001 |
.003 |
.005 |
.007 |
.009 |
.012 |
.014 |
.016 |
Duralumin |
90-104 |
.001 |
.003 |
.005 |
.010 |
.015 |
.018 |
.020 |
.025 |
Iron, Cast; Med Soft |
196 |
.001 |
.003 |
.005 |
.008 |
.010 |
.012 |
.014 |
.015 |
Iron, Cast; Hard |
293-302 |
– |
.001 |
.003 |
.005 |
.007 |
.009 |
.012 |
.012 |
Iron, Cast; Chilled |
402 |
– |
.001 |
.003 |
.005 |
.007 |
.009 |
.011 |
.011 |
Iron, Malleable |
112-126 |
– |
.002 |
.004 |
.007 |
.010 |
.012 |
.015 |
.018 |
Monel |
149-170 |
– |
.002 |
.003 |
.006 |
.008 |
.010 |
.012 |
.015 |
Nickel, Pure |
187-202 |
– |
.002 |
.003 |
.006 |
.008 |
.015 |
.018 |
.020 |
Nickel, Steel; 3 1/2% |
196-241 |
– |
.002 |
.003 |
.006 |
.008 |
.010 |
.012 |
.015 |
Rubber, Hard |
– |
.005 |
.010 |
.012 |
.015 |
.018 |
.020 |
.025 |
.030 |
Screw Stock, C.R. |
170-196 |
.001 |
.003 |
.004 |
.007 |
.010 |
.012 |
.015 |
.018 |
Stl, Carbon |
175-225 |
.001 |
.003 |
.004 |
.007 |
.010 |
.012 |
.015 |
.018 |
Stl, Drop Forged |
170-196 |
.001 |
.002 |
.004 |
.007 |
.010 |
.012 |
.015 |
.018 |
Stl, Machinery |
170-196 |
.001 |
.003 |
.005 |
.009 |
.012 |
.013 |
.018 |
.022 |
Stl, Magnet; Soft |
241-302 |
– |
.002 |
.003 |
.006 |
.008 |
.009 |
.010 |
.011 |
Stl, Magnet; Hard |
321-512 |
– |
.0005 |
.001 |
.002 |
.002 |
.003 |
.003 |
.004 |
Stl, Mang.; 7-13% |
187-217 |
– |
.0005 |
.001 |
.002 |
.002 |
.003 |
.003 |
.004 |
Stl, Mild; .20-.30C |
170-202 |
.001 |
.003 |
.005 |
.010 |
.015 |
.018 |
.020 |
.025 |
Stl, Molybdenum |
196-235 |
– |
.002 |
.004 |
.006 |
.010 |
.012 |
.015 |
.018 |
Stl, Spring |
402 |
– |
.002 |
.003 |
.005 |
.007 |
.009 |
.010 |
.010 |
Stl, Stainless |
150-225 |
.001 |
.002 |
.004 |
.006 |
.008 |
.011 |
.013 |
.016 |
Stl, Stainless |
460-520 |
– |
.0005 |
.001 |
.002 |
.002 |
.003 |
.003 |
.004 |
Stl, .40-.50C |
170-196 |
.001 |
.002 |
.004 |
.007 |
.010 |
.012 |
.015 |
.018 |
Stl, Struct; A-36 |
160 |
.001 |
.003 |
.005 |
.010 |
.015 |
.018 |
.020 |
.025 |
Stl, Tool; SAE, Forged |
149 |
– |
.002 |
.003 |
.006 |
.009 |
.011 |
.014 |
.016 |
Stl, Tool; SAE, Forged |
402 |
– |
.0005 |
.001 |
.002 |
.002 |
.003 |
.003 |
.004 |
Zinc, Alloy |
112-126 |
.002 |
.003 |
.007 |
.012 |
.016 |
.018 |
.020 |
.025 |