Steel Alloy,                  
300-400 Brinnel
20-30
1250-1800
600-900
400-600
300-450
250-350
200-300
175-250
150-225
Stainless Steel,
 
 
 
 
 
 
 
 
 
Cast Iron, Hard
30-40
1800-2500
900-1200
600-800
450-600
350-500
300-400
250-350
225-300
Steel
 
 
 
 
 
 
 
 
 
Forgings
40-50
2500-3100
1200-1500
800-1000
600-750
500-600
400-500
350-425
300-400
Steel, Tool Annealed,
 
 
 
 
 
 
 
 
 
.90-1.20 Carbon
50-60
3100-3700
1500-1800
100-1200
750-900
600-700
500-600
425-525
400-450
Steel,
 
 
 
 
 
 
 
 
 
.40-.50 Carbon
70-80
4300-5000
2100-2500
1400-1600
1000-1200
850-1000
700-800
600-700
500-600
Cast Iron,
 
 
 
 
 
 
 
 
 
Medium Hard
70-100
4300-6000
2100-3000
1400-2000
1000-1500
850-1200
700-1000
600-900
500-800
Bronze,
 
 
 
 
 
 
 
 
 
High Tensile Strength
70-150
4300-9000
2100-4500
1400-3000
1000-2300
850-1200
700-1530
600-1300
500-1200
Malleable
 
 
 
 
 
 
 
 
 
Iron
80-90
5000-5500
2500-2800
1600-1800
1200-1400
950-1100
800-900
700-800
600-700
Steel, Mild
 
 
 
 
 
 
 
 
 
.20-.30 Carbon
80-110
5000-6700
2500-3400
1600-2300
1200-1700
950-1350
800-1150
700-1000
600-850
Cast Iron,
 
 
 
 
 
 
 
 
 
Soft Plastic
100-150
6000-9000
3000-4500
2000-3000
1500-2300
1200-1800
1000-1530
900-1300
800-1200
Aluminum,
 
 
 
 
 
 
 
 
 
Brass, Bronze
200-300
12,000-18,000
6000-9000
4000-6000
3000-4500
2400-3700
2000-3000
1700-2600
1500-2300
Magnesium
 
 
 
 
 
 
 
 
 
 
250-400
15,500-25,000
7500-12,000
5000-8200
3800-6100
3000-4900
2500-4000
2200-3500
1900-3000
Fiberglass,
 
 
 
 
 
 
 
 
 
Wood
300-400
18,000-25,000
9000-12,000
6000-8200
4600-6100
3700-4900
3000-4000
2600-3500
2300-3000
Actual drilling or cutting RPM will be approximately 80% of rated spindle speed of tool. Surface Feet Per Minute = .26 x RPM x Drill Diameter in Inches.


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