hole-saw-wood

Recommended speeds hole saws

Bi-metal hole saws are ideal for cutting perfectly round holes in metals, plastics and wood. A correct drilling speed is important for a good result and a longer lifespan of the holesaw. On this page you´ll find (in two tabels) the correct drilling speeds in revolutions per minute (rpm) for using Bi-Metal HSS holesaws in various materials.

  • The first table shows the drilling speeds in plastic, steel, cast iron and inox.
  • The second table shows the drilling speeds in copper, aluminium and wood.

Whenever possible, use cutting oil to lubricate the hole saw when drilling metal. There´s one exception: Cast iron is always drilled dry, so don´t use any sort of lubrication when drilling in this metal.


diam. RPM
(mm) plastic steel cast iron inox
14 580 580 400 300
16 550 550 365 275
17 500 500 330 250
19 460 460 300 230
20 440 440 290 220
22 390 390 260 195
25 350 350 235 175
27 325 325 215 160
28 315 315 210 155
29 300 300 200 150
30 285 285 190 145
32 275 275 180 140
33 260 260 175 135
35 250 250 165 125
38 230 230 150 115
40 220 220 145 110
43 205 205 135 100
44 1952 195 130 95
48 180 180 120 90
50 175 175 115 85
54 160 160 105 80
57 150 150 100 75
59 145 145 100 75
60 140 140 98 70
64 135 135 90 65
67 130 130 85 60
68 125 125 80 60
74 120 120 80 60
75 115 115 75 55
79 110 110 70 55
83 105 105 70 50
86 100 100 65 50
89 95 95 65 45
95 90 90 60 45
100 85 85 55 40
114 75 75 50 35
121 75 75 50 35
125 65 65 45 30
133 60 60 40 25
150 55 55 35 25
165 55 55 35 25
178 55 55 35 25
hole-saw-hss
Common type hole saw. Hole saws typically have a pilot drill bit (arbor) at their center to keep the saw teeth from walking.

diam. RPM
(mm) copper aluminium wood
14 790 900 3000
16 730 825 3000
17 665 750 3000
19 600 690 3000
20 580 660 3000
22 520 585 3000
25 470 525 2700
27 435 480 2700
28 440 470 2700
29 400 450 2700
30 380 425 2400
32 380 425 2400
33 345 390 2400
35 330 375 2400
38 300 345 2400
40 290 330 2100
43 270 305 2100
44 260 295 2100
48 240 270 2100
50 235 260 2000
54 210 240 2000
57 200 225 2000
59 195 225 2000
60 190 220 2000
64 180 205 1800
67 170 195 1800
68 160 185 1800
74 155 175 1700
75 150 170 1500
79 140 165 1500
83 140 155 1500
86 130 150 1200
89 130 145 1200
95 120 135 1200
100 110 130 1000
114 100 105 900
121 95 95 900
125 90 90 800
133 85 85 800
150 75 75 800
165 75 75 800
178 75 75 800
heavy-duty-hole-saw-hss-28mm
Heavy duty hole saw wich cuts a variety of materials including cast iron and other metals. The grub screw holds the saw firmly against the shaft of the drill bit so that it revolves at the same speed.
dormer-cutting-fluid

Cutting oil
Why you should use cutting oil to lubricate the hole saw when drilling metal (except cast iron)

  1. It reduces friction, which keeps the hole saw cooler so it cuts better and lasts longer.
  2. Cutting oil helps flush metal chips out of the kerf, allowing the saw teeth to do their job.

Some metalworkers insert a sponge soaked in cutting oil into the hole saw. This gives them a self-lubricating hole saw, wich works perfectly.

Remember!
Cast iron is always drilled dry.




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