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

 

Back to Usefull Charts