5.5mm End Mills | McMaster-Carr

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5 Products

High-Speed Steel Square End Mills

2 Flutes

4 Flutes

Use these end mills for general purpose milling in most material, such as aluminum, brass, bronze, iron, and steel. They have a square end for milling square slots, pockets, and edges.

End mills with fewer flutes provide better chip clearance for high-volume, high-speed plunge, slotting, and roughing cuts; end mills with more flutes provide a finer finish and operate with less vibration when run at high speeds.

Uncoated High-Speed Steel—Use uncoated end mills for general purpose milling and short production runs.

Titanium Nitride (TiN)-Coated High-Speed Steel—Use titanium nitride (TiN)-coated end mills for demanding, high-speed jobs in hard material as well as for longer production runs. They’re more wear resistant than uncoated end mills, which means they last longer when run at similar speeds.

Center Cutting—Center-cutting end mills allow plunge cuts into a surface.

	Mill, mm
	Dia.	Dia. Tolerance	Shank Dia., mm	Lg. of Cut, mm	Overall Lg., mm	Flute Spacing	Helix Angle	For Use On	End Mill Type	Cut Style		Each
Uncoated High-Speed Steel







				2 Flutes

				5.5	0.000 to 0.025	9.5	12.7	59	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Square	8853A72	000000




						4 Flutes

						5.5	0.000 to 0.038	9.5	15.9	62	Equal	30°	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	Center Cutting	Square	8854A16	00000


						Titanium Nitride (TiN)-Coated High-Speed Steel







										2 Flutes

										5.5	0.000 to 0.025	9.5	12.7	59	Equal	30°	Aluminum, Brass, Bronze, Hardened Steel, Iron, Nickel, Stainless Steel, Steel, Tool Steel	Center Cutting	Square	8694A19	00000

Fast-Cut Carbide Square End Mills with Chamfer Corner

4 Flutes

A 45° corner chamfer improves cutting edge strength, so these end mills last longer than standard square end mills when milling hard material; however they do not create as sharp of a corner. Variable spacing between the flutes reduces vibration, allowing these end mills to provide fast cuts, smooth finishes, and long tool life on hard materials. They have a square end for milling square-bottomed slots, pockets, and edges. All are center cutting, allowing plunge cuts into a surface.

Made of solid carbide, these end mills are harder, stronger, and more wear resistant than high-speed steel and cobalt steel for the longest life and best finish on hard material. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the end mill from breaking.

Aluminum Titanium Nitride (AlTiN)-Coated Carbide—Titanium aluminum nitride (TiAlN)- and aluminum titanium nitride (AlTiN)-coated end mills dissipate heat better than other end mills, especially at high speeds. At high temperatures, the coating creates a layer of aluminum oxide that transfers heat to the chips, keeping the tool cool, even when used without lubrication.

Titanium Aluminum Silicon Nitride (TiAlSiN)-Coated Carbide—Titanium aluminum silicon nitride (TiAlSiN)-coated end mills are extremely resistant to wear and diffusion because they have especially high hardness, even at high temperatures.

Overall Lg., mm	Chamfer Wd., mm	Corner Cutting Angle	Flute Spacing	Helix Angle	For Use On	End Mill Type		Each







Aluminum Titanium Nitride (AlTiN)-Coated Carbide—4 Flutes

5.5	6	13	57	0.2	45°	Variable	36° to 38°	Stainless Steel, Titanium	Center Cutting	8207A466	000000




		Titanium Aluminum Silicon Nitride (TiAlSiN)-Coated Carbide—3 Flutes

		5.5	6	13	57	0.08	45°	Variable	41° to 45°	Iron, Nickel, Stainless Steel, Steel, Titanium	Center Cutting	8745A328	00000