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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

 

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