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End Mills (and Router Bits)

End mills are the cutting tools (also called router bits) that are inserted into the collet of a spindle or router. It is the part that spins and does all of the cutting in all directions. Some end mills can plunge into the material (like drilling). All end mills have the ability to cut sideways (also called profiling).

Important Formulas:
Feedrate (IPM - Inches/Min) = Spindle RPM x # of Flutes x Chip Load
See each end mill for the chip load value.

If your machine cannot achieve these feed rates, reduce the spindle RPM using this formula:
Speed (RPM) = Feed Rate (IPM) / (# of Flutes x Chip Load)

Compression End Mills

If you want a good quality cut along the top and bottom edge, the compression tool is what you will need.

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(60-113) Onsrud Compression End Mill - Cut Length - 7/8 inch or 22.225mm

$61.95
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A combination upcut and downcut end mill cutter for best quality on the top and bottom edges of the material being cut. Very High Quality End Mill from Onsrud Will create a flat bottom surface

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Bottom Clearing (Surfacing) End Mills

These end mills will create a flat surface. Generally, these end mills are great for surfacing your spoil board on your CNC machine, but can be used to surface for other purposes as well.

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Onsrud Spoilboard Surfacing Cutter

$326.95
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Onsrud Surfacing Cutter Inserts (2 pack)

$14.95
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Onsrud Surfacing Cutter Inserts (10 pack)

$49.95
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Get your spoilboard dead flat and surface in minutes. At 16,000 RPM, you can shave off 1/16" of your spoilboard at 200-600 IPM. At 2-1/2" wide, the table will be surfaced very quickly!

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Single Flute End Mills:

My personal favorate when cutting plastic or for quiet wood cutting. The cutting speeds can be increased when using these end mills since the chip load cavity is larger than the standard two flute end mills. Upcut end mills (router bits) will leave good finish to the bottom edge of the material but can lift thin or light material since the geometry is designed to cut in the upward direction. If thin or light material must be cut and you want a good top edge finish, consider downcut end mills

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1/4" x 1-1/4" Solid Carbide One Flute Downcut Super O Flute for Plastic, Wood, Aluminum

$62.25
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1/4" by 3/4" Solid Carbide Single Flute Downcut Super O Flute for Plastic, Wood, Aluminum, Solid Surface

$44.85
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This Onsrud End Mill features a 1/4" solid carbide single flute downcut for plastic, wood, and aluminum cutting.

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Shank and Cut Diameter 1/4" (6.35mm) Cut Length: 1/2" (13mm)

$29.85
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Sharp Tools 1/4" x 1" (25mm) Single Flute

$34.95
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Sharp Tools 1/4" x 1" (25mm) Single Flute - 5 Pack

$149.95
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Sharp Tools 1/4" x 1" (25mm) Single Flute - 10 Pack

$289.95
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These have a single flute with a deep cavity to carry a lot of material out of the cut. It's like digging with a shovel that can hold much more dirt.

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(65-012) Onsrud Shank and Cut Diameter: 1/4" Shank : 1/2" (13mm), Cut Length 1/8" Cut Diameter

$34.90
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(65-000) Onsrud Cut Diameter 1/16" Cut Length: 1/4" Shank: 1/8"

$34.90
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Sharp Tools - Single flute 1/8" shank 1/2" cut length

$16.95
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These end mills have a single flute to cut plastics and wood very efficiently.

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(65-026) Onsrud Super 'O' Cut and Shank Diameter: 1/4" (6.35mm) Cut length: 1-1/4" (31.75mm)

$60.35
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(65-025) Onsrud Super 'O' Cut and Shank Diameter: 1/4" (6.35mm) Cut Length: 1" (26mm)

$54.00
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This is a very high quality end mill for cutting plastics, wood and aluminum.
Will create a flat bottom surface
Cut Diameter - 1/4 inch or 6.35mm
Shank diameter - 1/4 inch or 6.35mm

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Two Flute End Mills (General Purpose):

These end mills are the workhorses and will generally cut most materials, but keep an eye on the feedrate.

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1 1/2" Carbide Tipped Two Flute Straight 90° V Flute for V-Grooving or Beveling Edges for Wood

$38.45
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This Onsrud End Mill features a 1-1/2" Carbide Tipped Two Flute Straight 90° V Flute for V-Grooving or beveling edges for wood. These are especially useful for sign-making and letter carving.

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1" Carbide Tipped Two Flute Straight 60° V Flute for V-Grooving or Beveling Edges for Wood

$32.95
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This Onsrud End Mill features a 1" Carbide Tipped Two Flute Straight 60° V Flute for V-Grooving or beveling edges for wood. These are especially useful for sign-making and letter carving.

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2" Carbide Tipped Two Flute Straight 120° V Flute for V-Grooving or Beveling Edges for Wood

$38.45
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This Onsrud End Mill features a 2" Carbide Tipped Two Flute Straight 120° V Flute for V-Grooving or beveling edges for wood. These are especially useful for sign-making and letter carving.

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2" Carbide Tipped Two Flute Straight 140° V Flute for V-Grooving or Beveling Edges for Wood

$38.45
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This Onsrud End Mill features a 2" Carbide Tipped Two Flute Straight 140° V Flute for V-Grooving or beveling edges for wood. These are especially useful for sign-making and letter carving.

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Single End Mill

$20.95
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Cut deeply into wood with this extra long length of 1-1/8". Features include, solid carbide (micro grain), 2 flutes, right hand rotation (up cut), overall length of 3", 1/4" shank diameter and 1/4" cut diameter, and a 30 degree helix.

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1/4" 2 Flute Straight V Flute End Mill

$32.15
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Onsrud 1/4" Solid Carbide Two Flute Straight V for Woods and Wood Composites. Shank: 1/4", Cut Diameter: 1/4"

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Onsrud 1/4" diameter 1" cut length end mill (Extended Shank Length) Overall Length: 4"

$62.60
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Onsrud 1/4" diameter 7/8" cut length end mill

$60.00
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Onsrud 1/4" Solid Carbide Two Flute UpCut Ballnose End Mill for Plastics, Solid Surface, Aluminum, and Wood. Shank: 1/4", Cut Diameter: 1/4"

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Onsrud 1/8" (Extended Length) End Mill. Shank: 1/4", Cut Length: 1/2", Overall Length: 3"

$55.40
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This is an upcut, ballnose end mill with a point geometry designed for wood, plastics, and aluminum.

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Chipbreaker/Finisher Down Cut 1/2" Cut Diameter, 1/2" Shank, 1-5/8" Cut Length, 3-1/2" Overall Length

$78.95
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If you want very fast cutting speeds and work with natural woods (hard and soft), and you want a great finish at the same time, this is the end mill to use. The end mill appears similar to a roughing (hog) end mill, but doesn't exhibit as many serrations. The geometry will provide a flat surface

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Chipbreaker/Finisher Down Cut 3/8" Cut Diameter, 3/8" Shank, 1-1/8" Cut Length, 3" Overall Length

$42.50
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If you want very fast cutting speeds and work with natural woods (hard and soft), and you want a great finish at the same time, this is the end mill to use. The end mill appears similar to a roughing (hog) end mill, but doesn't exhibit as many serrations. The geometry will provide a flat surface

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Chipbreaker/Finisher Up Cut 1/2" Cut Diameter, 1/2" Shank Diameter, 1-5/8" Cut Length

$63.00
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If you want very fast cutting speeds and work with natural woods (hard and soft), and you want a great finish at the same time, this is the end mill to use. The end mill appears similar to a roughing (hog) end mill, but doesn't exhibit as many serrations. The geometry will provide a flat surface

Click here for more information on this product.

PCB Isolation and Etching End Mills:

These are etching and engraving bits that can be used with non-ferrous metals, hardwoods, phenolics, stabilized woods and composite materials.

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Single End Mill

$13.95
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10 Pack

$129.50
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End Mill with ZrN coating

$16.95
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10 Pack

$159.50
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This bit features a 1/8" shank 2 flute and 60 degree "V" point tip to cut the really thin grooves needed to isolate traces. This end mill is available uncoated, or ZrN (Zirconium Nitride) coating to extend tool life and increased cut quality.

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3D Carving Tools:

For all types of applications including: dimensional signage, 3D carving, 3D contouring and profiling, cabinetry and furniture, and 3D millwork.

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Single End Mill

$39.95
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Single End Mill (ZrN Coating)

$49.95
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Specifications: 1/4" shank, 2" in total length, maximum of .0002" runout, solid sub-micrograin carbide. Oh yeah, the cut creates a really smooth edge or surface. These are available with or without ZrN coating for longer life.

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Single End Mill

$42.95
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Single End Mill (ZrN Coating)

$52.95
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If you are looking for finer carvings, consider this 3D Carving tool featuring a 1/32" tip.

Tangential Dragknife Cutting Tools:

If you need to cut thin or flexible materials like vinyl, cardboard, paper, mat board, or whatever yo would normally cut with a utility knife this is the cutting tool for you. Just slip this tool into the collet of your spindle or router and allow the drag knife to follow the direction and curves that your CNC moves.

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Drag Knife - Tangential CNC Knife - D2 for 1/2" Collet

$229.00
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Drag Knife - Tangential CNC Knife - D4 for 1/4" Collet

$229.00
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The Donek Tools Drag Knife allows you to cut a wide array of things you would normally use a utility knife for, but with the precision of CNC.

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See instructions for this product.

A few important facts:

  • Overall length or OAL is the total length of the end mill.
  • Flutes are the portion of the end mill that does the cutting with sharp spiral or non spiral edges. Flutes can be up-cut (brings the chips up and out of the cut) or down-cut (forces the chips downward). Up-cut flutes will generally create a nice edge finish on the bottom of the material. Down-cut will create a nice top edge finish.
  • Shank is the portion of the end mill that does not have flutes and is used as the area for collet contact.
  • Most of the measurements will be shank diameter and flute diameter and flute length. Shank diameter is important in that you will need the correct collet to receive the shank. FLute diameter will create the width of the cut, or hole size.