SERVICE. TRUST. RESULTS.
SUGGESTED RPM
Lubrication: Cutting oil (during cut) or cutting paste (before cut)
Material
Drill Bit Size
Aluminum
Brass/Bronze
Mild & Cast Steel
Mid-Grade Steel
High Strength Steel
Stainless Steel
Alloy, Forged or Tool Steel
Hard Cast Irons
SFM
200
150
100
75
55
40
30
20
1/8" 3/16" 1/4" 5/16"
MAX
1800
1200
900
650
500
350
250
MAX
MAX
1500
1150
850
600
450
300
MAX
MAX
MAX
1500
1100
800
600
400
MAX
MAX
MAX
MAX
1700
1200
900
600
MAX
1650
1100
850
600
450
350
200
MAX
1550
1000
750
550
400
300
200
MAX
1550
1000
750
550
400
300
200
1750
1300
900
700
500
350
250
200
1650
1200
800
600
500
300
250
200
1550
1150
750
600
400
300
250
150
1350
1000
700
500
400
300
200
150
1250
900
600
450
350
250
200
100
1100
850
550
400
300
200
150
100
1000
750
500
400
300
200
150
100
11/32" 3/8" 13/32" 7/16" 15/32" 1/2" 9/16" 5/8" 11/16" 3/4"
Max = You can top out most cordless and air drills. All figures rounded to closest 50 RPM.
SFM = Surface Feet per Minute, an indication of how fast you should be drilling through this material.
