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Suggested Speeds (RPM) for RotaCut™ Sheet Metal Cutters
and Holcutter™*

Diameter
Inches
Decimal Equivalent
Mild Steel
Soft Aluminum
Stainless Steel
and Tool Steel
1/4"
0.2500
1530
11920
765
5/16"
0.3125
1220
9535
610
3/8"
0.3750
1020
7945
510
7/16"
0.4375
875
6810
440
1/2"
0.5000
765
5960
380

9/16"
0.5625
680
5300
340
5/8"
0.6250
610
4770
300
11/16"
0.6875
560
4335
280
3/4"
0.7500
510
3975
255
13/16"
0.8125
470
3670
235

7/8"
0.8750
440
3405
220
15/16"
0.9375
410
3180
205
1"
1.0000
385
2980
190
1-1/16"
1.0625
360
2805
180
1-1/8"
1.1250
340
2650
170

1-1/4"
1.2500
305
2385
155
1-5/16"
1.3125
290
2270
145
1-3/8"
1.3750
280
2170
140
1-7/16"
1.4375
270
2075
135
1-1/2"
1.5000
255
1985
130

1-9/16"
1.5625
245
1910
120
1-5/8"
1.6250
235
1835
120
1-11/16"
1.6875
225
1765
110
1-3/4"
1.7500
220
1700
110
1-13/16"
1.8125
210
1645
105

1-7/8"
1.8750
205
1590
100
1-15/16"
1.9375
200
1540
100
2"
2.0000
190
1490
95
2-1/16"
2.0625
185
1445
95
2-1/8"
2.1250
180
1400
90

2-1/4"
2.2500
170
1325
85
2-5/16"
2.3125
165
1490
85
2-3/8"
2.3750
160
1255
80
2-7/16"
2.4375
160
1220
80
2-1/2"
2.5000
150
1190
75

2-9/16"
2.5625
150
1160
75
2-5/8"
2.6250
146
1135
70
2-11/16"
2.6875
140
1110
70
2-3/4"
2.7500
140
1080
70
2-13/16"
2.8125
135
1060
65

2-7/8"
2.8750
130
1035
65
2-15/16"
2.9375
130
1015
65
3"
3.0000
130
990
65

Note: These are just starting points and speed may have to be adjusted accordingly.
For Metric Cutters use closest fractional size.

*For longest tool life and best performance, always use
RotaMagic™ Cutting Fluid or Slick Stik™ Lubricant.


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