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End Mills

End mills are the cutting tools (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).

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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Onsrud Compression End Mill - Cut Length - 7/8 inch or 22.225mm

$61.95
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Very High Quality End Mill from Onsrud
Will create a flat bottom surface
Cut Diameter - 1/4 inch or 6.35mm
Shank diameter - 1/4 inch or 6.35mm
Excellent Quality on Top and Bottom Edges of Cut

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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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Cut (surfacing) Diameter - 2-1/2"
Shank Diameter - 1/2"
Shank Length - 2"
Usage - Aluminum, plastics and composite wood
Replaceable inserts (The part that actually does the cutting) required and includes two inserts already installed

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Single Flute Upcut 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.

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

$29.85
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Shank and Cut Diameter: 1/4" (6.35mm) Cut Length: 3/4" (20mm)

$32.25
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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. These end mills are designed mainly for plastic but will work with wood and it is surprisingly more quiet than the two flute end mills. This end mill 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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Onsrud Shank and Cut Diameter: 1/8" Cut Length: 1/2" (13mm)

$34.90
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Cut Diameter: 1/8" (3.175mm) Shank Diameter: 1/4" (6.35mm) Cut Length: 3/4" (20mm)

$26.13
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These end mills have a single flute to cut plastics and wood very efficiently.

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

$60.35
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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 Upcut 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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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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Onsrud 1/4" Solid Carbide Two Flute UpCut Ballnose (Extended Length) End Mill for Plastics, Solid Surface, Aluminum, and Wood

$62.60
Qty:
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Onsrud 1/8" Solid Carbide Two Flute UpCut Ballnose (Extended Length) End Mill for Plastics, Solid Surface, Aluminum, and Wood

$55.40
Qty:
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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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Onsrud chipbreaker half inch cut end mill

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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Onsrud 60-950 Chipbreaker finisher end mill

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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chipbreaker/finisher end mill up cut double flute

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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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.

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.