Drill Speed Chart
(RPM)

Material	1/16"	3/32"	1/8"	3/16"	1/4"	5/16"	3/8"	1/2"
Die casting (zinc base) x 3.5	10710	7175	5355	3570	2660	2135	1785	1330
Aluminum x 2.5	7650	5125	3825	2550	1900	1525	1275	950
Brass x 2.0	6120	4100	3060	2040	1520	1220	1020	760
Bronze x 2.0	6120	4100	3060	2040	1520	1220	1020	760
Cast iron, soft x 1.15	3519	2358	1760	1173	874	702	587	437
Mild Steel (default RPM)	3060	2050	1530	1020	760	610	510	380
Malleable iron x .85	2600	1743	1300	867	646	520	435	323
Cast iron, hard x .80	2448	1640	1224	816	608	488	408	304
Tool steel x .60	1836	1230	918	612	456	366	306	228
Stainless steel x .30	918	615	459	306	228	183	153	114
Chilled cast iron x .20	612	410	306	204	152	122	102	76
Manganese steel x .15	459	308	230	153	114	92	77	57
Millimeters	1,5875	2,38125	3,175	4,7625	6,35	7,9375	9,525	12,7

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