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4-Flute NaCo4 Carbide Corner Radius End Mill | VHM

Kortools

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Ø1xR0.2x4Dx50L

Ø1.5xR0.2x4Dx50L

Ø2xR0.2x4Dx50L

Ø3xR0.2x4Dx50L

Ø4xR0.2x4Dx50L

Ø3xR0.5x3Dx50L

Ø3xR0.5x4Dx50L

Ø4xR0.5x4Dx50L

Ø4xR1x4Dx50L

Ø5xR0.5x5Dx50L

Ø5xR1x5Dx50L

Ø6xR0.5x6Dx50L

Ø6xR1x6Dx50L

Ø8xR0.5x8Dx60L

Ø8xR1x8Dx60L

Ø10xR0.5x10Dx75L

Ø12xR0.5x12Dx75L

Ø12xR1x12Dx75L

Ø4xR0.5x4Dx75L

Ø6xR0.5x6Dx75L

Ø6xR1x6Dx75L

Ø8xR0.5x8Dx75L

Ø8xR1x8Dx75L

Ø10xR0.5x10Dx100L

Ø10xR1x10Dx100L

Ø12xR0.5x12Dx100L

Ø12xR1x12Dx100L

Ø4xR0.5x4Dx100L

Ø6xR0.5x6Dx100L

Ø6xR1x6Dx100L

Ø8xR0.5x8Dx100L

Ø8xR1x8Dx100L

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Product description

4-flute solid carbide corner radius end mill — NaCo4

Corner radius R · solid carbide · CNC machining

The NaCo4 corner radius end mill has four cutting flutes and a solid carbide body with a radius at the corner of the cutting section. Its applications include stainless steel, carbon steels, alloy steels and mould steels. It is intended for CNC machining centres, CNC milling machines and suitably equipped high-speed engraving machines.

When selecting a cutter, distinguish between cutting diameter, corner radius R, shank diameter and overall length L. These are separate dimensions. Corner radius does not determine cutter diameter, and the cutting diameter is not always equal to the shank diameter.

1. Corner radius geometry and applications

The four helical flutes have rounded corners specified by radius R. The body is made of solid carbide. The tool has a coating designated NaCo4.

Operation	Application
Surface milling	Machining surfaces while accounting for the radius at the tool corner.
Side milling	Machining the sides and walls of a workpiece.
Hole machining	Machining existing holes with a suitable milling strategy. This does not imply a recommendation for full-width drilling into solid material.
Slot milling	Machining slots with corner geometry determined by the selected R value.
U-shaped slot machining	Use for U-shaped slots, with diameter and radius selected to match the workpiece drawing.

Match the tool path and cutting conditions to the material, workpiece geometry and machine capabilities. Corner radius is a parameter of the individual variant.

2. Workpiece materials

The table distinguishes particularly suitable, suitable and non-recommended materials for this family. Selecting the specific material grade and cutting conditions remains part of preparing the operation.

Material	Suitability
General-purpose and alloy steels	Suitable materials.
Carbon steel	Particularly suitable material.
Pre-hardened steel	Suitable material.
Quenched and tempered steels and mould steels	Suitable materials.
Stainless steel	Particularly suitable material.
Heat-resistant alloys and titanium alloys	Not recommended for this family.
Cast iron	Not recommended for this family.
Copper alloys	Suitable materials.
Graphite and CFRP composites	Not recommended; CFRP means carbon-fibre-reinforced polymer composites.
Aluminium alloys	Not recommended for this family; select an end mill intended for aluminium.

3. Construction and technical specifications

Parameter	Value or description
Tool type	Shank-type end mill with a corner radius
Tool material	VHM — solid carbide; stated grain size 0.4 µm
Number of flutes	4
Coating	NaCo4
Cutting diameter	From 1 to 12 mm, depending on the variant
Corner radius R	0.2, 0.5 or 1 mm, depending on the variant
Shank diameter	From 3 to 12 mm, depending on the variant
Overall length L	50, 60, 75 or 100 mm, depending on the variant
Unit of sale	1 piece — one cutter of the selected variant

The ranges describe the product family, not the ability to combine dimensions freely. Select a specific combination of diameter, radius, shank and length in the variant selector.

4. Reading the designation and dimensions

Example: Ø4xR0.5x4Dx75L means a cutting diameter of 4 mm, a corner radius of R0.5 mm, a Ø4 mm shank and an overall length of 75 mm. A decimal point in the code and a decimal comma in Polish text represent the same numerical value.

Dimension	Meaning
Cutting diameter Ø	Diameter of the cutting section, stated at the start of the code. Read it separately from the shank diameter.
Corner radius R	The rounded corner of the cutting section. This is not the radius of a complete ball nose; do not calculate cutter diameter as twice R.
Shank diameter	Diameter of the cylindrical section held in the tool holder. It follows the radius in the code and carries the letter D in some designations.
Overall length L	Length of the complete tool, from the cutting tip to the end of the shank. It is neither the cutting length nor the depth of a single pass.

On each variant card, diameters use the Ø symbol, radius uses R, and lengths and diameters are stated in millimetres. Do not determine dimensions by measuring the photograph.

5. Variants and tool lengths

The family includes overall lengths of 50, 60, 75 and 100 mm. Each length is offered in specific combinations of cutting diameter, corner radius and shank. A larger L value alone does not indicate cutting length.

The same cutting geometry can be combined with different shanks. For example, cutters with a cutting diameter of 3 mm, an R0.5 mm corner radius and an overall length of 50 mm are offered with either a 3 mm or a 4 mm shank. Selecting a collet requires checking the correct shank dimension.

If an operation requires a particular cutting length, check it separately before ordering. Overall length does not replace that information and should not be interpreted as a recommended tool overhang.

6. Selecting a variant for the workpiece and holder

Selection point	What to check
Cutting diameter and radius	Compare both dimensions with the workpiece drawing. The required corner radius does not replace the selection of cutting diameter.
Shank diameter	Match the collet or other suitable holder to the shank of the selected variant.
Length and overhang	Select a length that provides access to the machining area with the shortest practical overhang.
Material and machine	Check the material table and prepare the tool for use in a suitable CNC machine or engraving machine.

Before ordering, compare the complete code with the selected cutter card. When ordering several tools, check the full set of dimensions for each one.

7. Preparation and use

Check runout after clamping. Measure tool runout before machining. If it exceeds 0.01 mm, correct the setup and measure again. This is a check on the mounted tool, not a stated tolerance for the cutter diameter.
Limit overhang. Keep the tool extension from the holder as short as practical. For greater overhang, reduce spindle speed, feed or cutting engagement as appropriate for the operation.
Select cooling. Mist cooling or an air blast is recommended for machining steel. Match the cutting fluid and its delivery method to the material and process.
Respond to vibration and unusual noise. Check the holding arrangement and reduce speed and cutting engagement until the working conditions are correct.

This end mill is not intended for hand-held drills, drill presses or similar low-speed machines. Use a machine and holder suitable for milling.

8. Frequently asked questions

Does R mean half the cutting diameter?

No. In this cutter, R specifies the corner radius. Cutting diameter is a separate dimension and must be read from the code or variant card.

Does every variant have four flutes?

Yes. This is a family of four-flute end mills. Diameter, corner radius, shank and length depend on the selected version.

Is this cutter suitable for aluminium?

This family is not recommended for aluminium alloys. Select a suitable aluminium end mill for that application.

Does L mean cutting length?

No. L is the overall tool length. Cutting length requires a separate check if it determines tool selection.

What is supplied when I select a variant?

One cutter with the selected cutting diameter, corner radius, shank diameter and overall length. Check the complete set of dimensions before ordering.