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Hougen RotaCut and Hole Cuter Suggest Speeds Chart

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

DiameterInches Decimal Equivalent Mild Steel Soft Aluminum Stainless Steel and Tool Steel
1/4" 0.25 1530 11920 765
5/16" 0.3125 1220 9535 610
3/8" 0.375 1020 7945 510
7/16" 0.4375 875 6810 440
1/2" 0.5 765 5960 380
9/16" 0.5625 680 5300 340
5/8" 0.625 610 4770 300
11/16" 0.6875 560 4335 280
3/4" 0.75 510 3975 255
13/16" 0.8125 470 3670 235
7/8" 0.875 440 3405 220
15/16" 0.9375 410 3180 205
1" 1 385 2980 190
1-1/16" 1.0625 360 2805 180
1-1/8" 1.125 340 2650 170
1-1/4" 1.25 305 2385 155
1-5/16" 1.3125 290 2270 145
1-3/8" 1.375 280 2170 140
1-7/16" 1.4375 270 2075 135
1-1/2" 1.5 255 1985 130
1-9/16" 1.5625 245 1910 120
1-5/8" 1.625 235 1835 120
1-11/16" 1.6875 225 1765 110
1-3/4" 1.75 220 1700 110
1-13/16" 1.8125 210 1645 105
1-7/8" 1.875 205 1590 100
1-15/16" 1.9375 200 1540 100
2" 2 190 1490 95
2-1/16" 2.0625 185 1445 95
2-1/8" 2.125 180 1400 90
2-1/4" 2.25 170 1325 85
2-5/16" 2.3125 165 1490 85
2-3/8" 2.375 160 1255 80
2-7/16" 2.4375 160 1220 80
2-1/2" 2.5 150 1190 75
2-9/16" 2.5625 150 1160 75
2-5/8" 2.625 146 1135 70
2-11/16" 2.6875 140 1110 70
2-3/4" 2.75 140 1080 70
2-13/16" 2.8125 135 1060 65
2-7/8" 2.875 130 1035 65
2-15/16" 2.9375 130 1015 65
3" 3 130 990 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.