1/8" Carbide End Mills in Canada

1/8" Carbide End Mills

1/8" (0.125", 3.175 mm) is the size where small work gets done - engraving, lettering, narrow slots, small pockets, fine contours and finishing passes on detail that a 1/4" tool cannot reach. It is also the size that breaks most often, because at this diameter everything that goes wrong in a cut shows up faster.

The range below covers square, corner radius (bull nose), ball nose and chamfer profiles in 2, 3 and 4 flutes, coated and uncoated, on a 1/8" shank. Flute length, coating and corner radius are on each product page.

Spindle speed is the real constraint at 1/8"

Carbide wants surface speed, and surface speed at a small diameter means rpm. As a rule of thumb, a 1/8" carbide end mill running 300 SFM in steel needs roughly 9,000 rpm; in aluminum at 800 SFM it wants more than 24,000. A machine that tops out at 6,000 rpm cannot get there, and the tool ends up rubbing instead of cutting - which work-hardens the material and rounds the edge off in minutes.

If your spindle is limited, drop the surface speed and the chip load together, keep the depth of cut light and accept a slower job. What does not work is running the recommended feed per tooth at half the recommended rpm.

Stick-out and depth of cut

Deflection rises with the cube of unsupported length, so an extra 1/4" of stick-out on a 1/8" tool costs far more rigidity than the same 1/4" on a 1/2" tool. Hold the shortest tool that reaches, clamp as deep in the collet as the geometry allows, and take depth in several passes rather than one.

A 1/8" shank runs in any ER collet series that covers it - ER11 through ER32 - and in 1/8" end mill holders. A worn or dirty collet costs runout, and runout at this diameter loads one flute and unloads the other, which is how a small cutter snaps.

Flutes and chip clearance

The flute valley on a 1/8" cutter is small, so chips have very little room to leave. In aluminum and other non-ferrous material use 2 or 3 flutes with air or coolant blowing chips clear - recut chips are the most common cause of a broken small end mill. In steel and stainless the chips are shorter and 4 flutes give a better finish and more edges in the cut.

Which profile to pick

Square - flat bottoms and sharp internal corners, slots and general work.
Corner radius (bull nose) - same work, R0.015" on the corner. At 1/8" the corner is the weakest point of the tool, so the radius buys real tool life in steel and stainless whenever the print allows it.
Ball nose - 3D contours, curved surfaces and finishing passes.
Chamfer - deburring and edge breaks on small parts, and spotting before drilling.

Need more diameter or more reach? See 3/16", 1/4" or the full end mill range.

Buying 1/8" End Mills from CNCmarket

Prices and stock are on every product page and you can order online without waiting for a quote. Delivery is free across Alberta and we ship anywhere in Canada.

We run our own machine shop in Calgary and cut with these tools ourselves. Send us the material, the machine and what you are cutting, and we will tell you which one we would use and at what speeds and feeds.

Frequently Asked Questions

1/8" Carbide End Mills

Spindle speed is the real constraint at 1/8"

Stick-out and depth of cut

Flutes and chip clearance

Which profile to pick

Square - flat bottoms and sharp internal corners, slots and general work.

Corner radius (bull nose) - same work, R0.015" on the corner. At 1/8" the corner is the weakest point of the tool, so the radius buys real tool life in steel and stainless whenever the print allows it.

Ball nose - 3D contours, curved surfaces and finishing passes.

Chamfer - deburring and edge breaks on small parts, and spotting before drilling.

Need more diameter or more reach? See 3/16", 1/4" or the full end mill range.

Buying 1/8" End Mills from CNCmarket

Prices and stock are on every product page and you can order online without waiting for a quote. Delivery is free across Alberta and we ship anywhere in Canada.

1/8 End Mill

1/8" Carbide End Mills

Spindle speed is the real constraint at 1/8"

Stick-out and depth of cut

Flutes and chip clearance

Which profile to pick

Buying 1/8" End Mills from CNCmarket

Frequently Asked Questions

1/8" Carbide End Mills

Spindle speed is the real constraint at 1/8"

Stick-out and depth of cut

Flutes and chip clearance

Which profile to pick

Buying 1/8" End Mills from CNCmarket

Frequently Asked Questions