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2-Flute Carbide End Mill for Steel 55 HRC - TiSiN - Solid Carbide

Kortools

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Ø6x24x6Dx75L

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Ø4x20x4Dx100L

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Ø10x40x10Dx100L

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Ø20x45x20Dx100L

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Ø4x16x4Dx75L

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Ø5x18x5Dx75L

Ø3x9x3Dx50L

Ø3x9x4Dx50L

Ø3.5x10x4Dx50L

Ø4x12x4Dx50L

Ø5x13x5Dx50L

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Product description

2-flute solid carbide end mill · TiSiN · 55 HRC series

For slots, pockets, flat surfaces and contours on CNC milling machines

A solid carbide shank end mill with a flat end. Two flutes and a TiSiN coating provide a tool for milling steel, stainless steel and cast iron. It is intended for machining centres and CNC milling machines; selection for hardened material must take account of the limitations below.

Choose the size by cutting diameter, flute length, shank diameter and overall length. These four dimensions identify the particular tool. The same cutting diameter does not necessarily mean the same shank size or flute length.

1. Milling applications

Operation	Application
Slot milling	Machining slots, including keyways and U-shaped slots. Match the cutting diameter to the slot width.
Pocket milling	Machining flat-bottomed pockets. Compare the flute length with the pocket geometry and access to its walls.
Face milling	Machining flat surfaces with a flat-end tool geometry.
Side milling and contouring	Machining walls, steps and profiles. Prepare the toolpath for the cutting diameter and flute length of the selected size.

The end mill has two flutes. Maintain chip evacuation when machining slots and pockets. Select the entry strategy and cutting conditions for the workholding, workpiece material and actual tool overhang.

2. Construction and specifications

Parameter	Value
Tool type	Solid carbide shank end mill with a flat end
Tool material	Solid carbide (VHM), fine-grain structure of 0.6 μm
Number of flutes	2
Coating	TiSiN
Series designation	55 HRC; material selection limits are given in section 3
Helix angle	35°
Shank type	Cylindrical
Cutting diameter	Ø1–20 mm, depending on the selected size
Flute length	3–80 mm, depending on the selected size
Shank diameter	Ø3–20 mm, depending on the selected size
Overall length	50, 60, 75, 100 or 150 mm, depending on the selected size

These ranges describe the tool family. Not every diameter is offered with every length and shank size. Check the specific combination in the size selector and on the corresponding dimension card.

3. Workpiece materials and selection limits

Material	Application and limitations
Structural, carbon and alloy steels	For steel and tool steel, taking account of their heat treatment condition. Select the cutting conditions for the specific material grade.
Stainless steel	A recommended application group. Consider the grade, milling operation and chip evacuation.
Cast iron	A recommended application group. Match the cutting conditions to the cast iron grade and workpiece geometry.
Hardened materials	Material recommendations cover hardness below 45 HRC. At 45 HRC and above, this tool is not a recommended choice without separate confirmation of suitability.
Copper alloys	A supported application. Match the cutting conditions to the particular alloy.
Heat-resistant alloys, titanium alloys, aluminium, graphite and CFRP	These are not recommended materials for this geometry. Choose a tool intended for the specific material group.

The 55 HRC series designation does not replace selection for the actual material. For hardened steel in the 45–55 HRC range, suitability must be confirmed separately before choosing the tool. Specify the material grade, actual hardness, operation and required tool dimensions.

4. How to read the size designation

Example: Ø6x15x6Dx50L. This specifies a cutting diameter of 6 mm, flute length of 15 mm, shank diameter of 6 mm and overall length of 50 mm. All dimensions are in millimetres.

Designation part	Meaning	Example value
Ø6	Cutting diameter	6 mm
15	Flute length, or cutting length	15 mm
6D	Cylindrical shank diameter	6 mm
50L	Overall tool length	50 mm

The dimension order stays the same when the cutting and shank diameters differ. The letter D after a number identifies the shank, while L identifies overall length. A decimal point in the selector and a decimal comma on a Polish card represent the same value: 1.5 mm equals 1,5 mm.

Flute length and overall length are different measurements. In this example, the flutes are 15 mm long and the complete tool is 50 mm long. L does not specify an allowable depth of cut or the overhang after mounting.

5. Choosing diameter and length

Select the cutting diameter. Compare it with the slot width, pocket geometry or contour to be machined. The first number in the size designation refers to the cutting portion.
Check the flute length. The second number identifies the cutting length. Match it to the surface and planned operation, separately from the overall tool length.
Match the shank diameter. Use a holder suitable for the specified shank. A 5 mm cutting diameter, for example, may be paired with a 5 or 6 mm shank, depending on the selected size.
Choose the overall length. Select enough length to reach the machining area, then keep overhang to the minimum required. Account for the overhang when setting cutting conditions for a long tool.
Compare the full designation with the dimension card. Check all four values before choosing. A longer version of the same cutting diameter may also have a different flute length.

Each dimension card gives the measurements of the corresponding size. The photograph is illustrative: select dimensions from the labels, not from the proportions of the photograph. This is particularly relevant to tools with the same diameter and different lengths.

6. Mounting, runout and overhang

Check how the tool is seated in the holder before machining. It is intended for suitably equipped machining centres and CNC milling machines. Low-speed bench drills and handheld drills are not suitable machines for this tool.

Check runout after mounting. If it exceeds 0.01 mm, correct the mounting before cutting. This figure is a check on the mounted tool, not a cutting diameter tolerance.
Keep overhang as short as possible. Extend the tool only as far as needed for the operation while maintaining correct shank clamping.
Account for long overhang in the settings. Reduce spindle speed, feed or cutting engagement as appropriate for a longer overhang. Do not automatically transfer settings from a short tool to a long version.
Respond to vibration and unusual noise. Check mounting and adjust spindle speed and cutting load before continuing the operation.

7. Cooling and cutting conditions

For steel machining, air blast or mist cooling are recommended. Working without flood coolant requires effective chip evacuation and conditions appropriate to the material and operation.

Select spindle speed, feed and depth of cut for the material grade and hardness, cutting diameter, flute length, overhang and milling operation. Full-slot milling, side milling and contour finishing require their own selection of cutting conditions.

8. Frequently asked questions

Does the end mill have two or four flutes?
It has two flutes. This family consists of 2-flute flat-end mills.

Is the cutting diameter always equal to the shank diameter?
No. Check the first dimension and the shank value ending in D separately. Choose the holder for the shank diameter.

Does a length of 150 mm mean 150 mm long flutes?
No. The value followed by L is overall length. Flute length is the second dimension in the size designation and is also shown on its dimension card.

Can the tool be used in a handheld drill?
No. It is intended for milling on a suitable machine; a handheld drill or low-speed bench drill does not provide the correct conditions for this operation.

Can hardened steel suitability be determined from the 55 HRC name alone?
No. Check the selection limits in section 3. For hardness of 45–55 HRC, suitability for the material grade and planned operation requires separate confirmation.