1/4 End Mill

Total found: 19

Only new

Only in stock

1/4" Carbide Ball Nose End Mill, 4 flutes, 0.8" LOC, AlCrN Coated

T4B-250-800In stock

CA$32.70

excl. taxes

1/4" Carbide End Mill, 4 flutes, Bull Nose - R0.015", 0.75" LOC, AlCrN Coated

80137756In stock

CA$32.15

excl. taxes

1/4" Carbide End Mill, 4 flutes, Bull Nose - R0.015", 0.5" LOC, AlCrN Coated, Extended Neck

T4R-250-015-500LIn stock

CA$46.83

excl. taxes

1/4" Carbide End Mill, 4 flutes, Bull Nose - R0.015", 0.5" LOC, AlCrN Coated

T4R-250-015-500In stock

CA$32.70

excl. taxes

1/4" Carbide End Mill, 4 flutes, Bull Nose - R0.03", 0.75" LOC, AlCrN Coated

T4R-250-030-750In stock

CA$32.70

excl. taxes

1/4" Carbide End Mill, 3 flutes, Bull Nose - R0.015", 0.625" LOC, Uncoated

3AF-250-015-625In stock

CA$32.98

excl. taxes

1/4" Carbide End Mill, 3 flutes, Bull Nose - R0.03", 0.625" LOC, Uncoated

3AF-250-030-625In stock

CA$32.98

excl. taxes

1/4" Carbide Chamfer Mill, 4 flutes, 45°, 0.5" LOC, Uncoated

4CHM-250-045-500In stock

CA$34.55

excl. taxes

1/4 Carbide Chamfer Mill, 0.25 shank x 0.125 LOC, 2.5 Overall Length, 2 Flute, Chamfer 45°, TiCN Coated

B05-3063Running out of stock

CA$19.30

excl. taxes

1/4 Carbide Chamfer Mill, 0.25 shank x 1/125" LOC, 2.5" Overall Length, 4 Flute, Chamfer 45°, TiCN Coated

B05-3064Running out of stock

CA$19.30

excl. taxes

1/4" Carbide Ball Nose End Mill, 2 flutes, 0.75" LOC, AlCrN Coated

80137743Running out of stock

CA$16.28

excl. taxes

1/4" Carbide End Mill, 4 flutes, Bull Nose - R0.015", 0.75" LOC, AlCrN Coated

T4R-250-015-750Running out of stock

CA$32.70

excl. taxes

1/4" Carbide End Mill, 3 flutes, Square End, 0.75" LOC, Uncoated

3AF-250-750Running out of stock

CA$25.46

excl. taxes

1/4 Carbide Ball End Mill, 4 flute, Hybrid AlCrN Coated, 0.25 shank x 0.75 LOC, helix angle 35/37

A06-2063Out of stock

CA$23.44

excl. taxes

1/4 Carbide end mill, 4 flute, TiAlN, 0.5 shank x 0.75 LOC, helix angle 38, 0.016 chamfer

A01-4063Archive

1/4" Carbide Square End Mill, 4 flutes, 0.75" LOC, AlCrN Coated

80137776Archive

1/4" Carbide Square End Mill, 2 flutes, 0.75" LOC, Uncoated

80137790Archive

1/4 Carbide End Mill, 3 flute, Uncoated, 0.25 shank x 0.75 LOC, helix angle 38

A03-1263Archive

1/4 Carbide end mill, 5 flute, TiAlN, 0.25 shank x 0.75 LOC, helix angle 38

A01-5063Archive

1/4" Carbide End Mills

1/4" (0.25", 6.35 mm) is the default. It is the size most shops standardise on, the one that sits in the holder between jobs, and the size we ship more of than any other diameter in this range. If a feature does not force a smaller or larger cutter, this is the one that goes in the spindle.

The range below covers square, corner radius, ball nose and chamfer profiles in 2, 3 and 4 flutes, coated and uncoated. Flute length, coating and corner radius are listed on each product page.

At 1/4" the machine stops being the limit

Below this size, spindle speed decides what you can do. At 1/4" it stops mattering: 300 SFM in steel needs about 4,600 rpm and 800 SFM in aluminum about 12,200. Any ordinary machining centre covers the first and most cover the second, so the cut is governed by rigidity, holding and toolpath rather than by what the spindle can reach.

That is the practical reason this diameter became the default. It is the smallest size you can simply run at the book numbers without arranging the whole job around the tool.

The economics: the cutter is the cheap part

At 1/4" a carbide end mill costs a fraction of an hour of spindle time and a small fraction of one scrapped part. That changes the sensible way to use it.

Run a worn cutter and you pay in surface finish, in size drift as the corner wears, and eventually in a part that has to be re-run. Change it early and you pay for a tool. The arithmetic almost never favours squeezing the last few parts out of a dull edge - which is why the shops that measure this keep spares of the two or three 1/4" tools they actually run, rather than ordering when the last one dies.

The same logic applies to buying one coated tool instead of two uncoated ones for the same steel job. Compare cost per part rather than cost per cutter.

Where 1/4" runs out

Two things push you off this size, and neither is about tool strength.

Internal corners. A 1/4" cutter cannot produce a corner tighter than 1/8" (0.125"). If the print calls for less, drop to 3/16" (3/32" corner) or 1/8" (1/16" corner) for that feature, and leave the bulk of the work to the 1/4".

Metal removal rate. When the job is mostly roughing and the machine has the power for it, 3/8" or 1/2" will clear the same volume in less time. Below that threshold the changeover costs more than it saves.

Note for metric prints: 1/4" is 6.35 mm, so it is 0.35 mm oversize against a 6 mm feature and undersize against 6.5 mm. Fine where the tool steps over, wrong as a drop-in for a metric slot.

Profiles and flute count

Square - flat bottoms and sharp internal corners.
Corner radius - the working default for steel and stainless, since the radius takes load off the corner and the corner is what wears first.
Ball nose - 3D contouring and finishing.
Chamfer - edge breaks, deburring and spotting.

2 and 3 flutes for aluminum and non-ferrous, 4 flutes for steel and stainless. A 1/4" shank fits any ER collet that covers it, 1/4" end mill holders and Weldon holders.

Buying 1/4" 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. If you are working out which 1/4" tools are worth keeping on the shelf for your mix of work, tell us what you cut and we will give you a straight answer rather than a catalogue page.

1/4 End Mill

1/4" Carbide End Mills

At 1/4" the machine stops being the limit

The economics: the cutter is the cheap part

Where 1/4" runs out

Profiles and flute count

Buying 1/4" End Mills from CNCmarket

Frequently Asked Questions

1/4" Carbide End Mills

At 1/4" the machine stops being the limit

The economics: the cutter is the cheap part

Where 1/4" runs out

Profiles and flute count

Buying 1/4" End Mills from CNCmarket

Frequently Asked Questions