HS(200) 4 flute carbide corner radius end mill with 0.2μm ultra-fine carbide and AlTiCrSiN PVD coating for hardened and mold steels up to 65 HRC, high-speed dry cutting and high-finish machining.
The HS(200) 4 flute corner radius end mill is developed for high-hardness milling where cutting-edge strength and surface quality are important.
Its reinforced corner geometry provides a stronger transition than a sharp square cutting edge, while the 0.2μm ultra-fine carbide substrate and AlTiCrSiN multi-element PVD coating support demanding machining conditions. The tool is designed for hardened steel and mold steel up to 65 HRC, with particular suitability for high-speed, dry and semi-dry machining where a controlled surface finish is required.
Stainless steel, titanium alloys and nickel-based high-temperature alloys are also within the stated application range.
Product Highlights
Why Use a Corner Radius for Hard Milling?
A corner radius changes the load distribution at the transition between the end and side cutting edges.
Stronger Cutting Corner
The rounded transition leaves more material behind the cutting edge than a sharp 90° corner, helping support the tool corner under higher cutting loads.
Reduced Corner Chipping Risk
A reinforced corner can be advantageous when machining hardened materials, where localized edge damage can quickly affect dimensional accuracy and tool performance. Commercial hardened-steel corner-radius tools likewise emphasize reinforced corners and reduced chipping.
Suitable for Profile and Pocket Work
The geometry combines a flat-bottom cutting profile with a controlled corner radius, making it suitable for pockets, shoulders, contours and related mold-machining operations.
Better Match for Hardened Materials
The corner radius is particularly useful where cutting loads are concentrated near the tool corner during hard milling.
Hard Milling up to 65 HRC
The main application of the HS(200) is high-hardness machining.
Hardened Steel
The tool is designed for hardened steel applications up to 65 HRC under appropriate cutting conditions.
Mold and Die Steel
The geometry is suitable for mold and die components where hard milling and controlled surface quality are required.
High-Speed Machining
The ultra-fine carbide substrate and AlTiCrSiN coating are designed for demanding high-speed cutting conditions.
Finishing and Semi-Finishing
The corner-radius profile can be used for finishing and semi-finishing operations where edge stability and surface quality are important.
Current HRC65 corner-radius products are similarly positioned for hardened mold, die and tool steels, with cavity, contour and finishing applications commonly highlighted.
Surface Finish Applications
Surface quality is an important part of the HS(200)’s positioning.
The combination of:
4-flute geometry + corner radius + 0.2μm ultra-fine carbide + AlTiCrSiN coating
is intended to support stable cutting in applications where the final machined surface matters.
Typical applications include:
Actual surface finish depends on tool runout, machine rigidity, toolholding accuracy, radial engagement, feed rate, tool diameter and workpiece condition.
AlTiCrSiN for High-Temperature Hard Milling
The AlTiCrSiN multi-element PVD coating is designed for demanding thermal and wear conditions.
High-Temperature Performance
The supplied product data specifies performance above approximately 1100°C for the coating system.
Wear Protection
The hard PVD coating helps protect the ultra-fine carbide substrate during high-speed machining of hardened materials.
Dry and Semi-Dry Cutting
The coating system is particularly suitable for dry and semi-dry machining, while coolant-assisted cutting can also be used when required.
Difficult-Material Capability
The coating and substrate combination also supports selected stainless steel, titanium alloy and nickel-based superalloy applications.
The approximately 1100°C figure refers to the stated high-temperature performance of the coating system and should not be interpreted as the actual cutting temperature at the tool edge.
0.2μm Ultra-Fine Carbide
The 0.2μm ultra-fine carbide substrate provides the cutting-edge foundation for high-hardness applications.
Its fine grain structure is intended to support:
For corner-radius tools, substrate strength is especially relevant because the reinforced corner is designed to withstand concentrated cutting loads.
Material Applications
| Workpiece Material | Application Focus |
| Hardened Steel ≤65 HRC | Hard milling, finishing and profiling |
| Mold Steel | Cavity and contour machining |
| Stainless Steel | Selected high-speed milling |
| Titanium Alloy | Difficult-material machining |
| Nickel-Based Superalloy | Selected high-temperature alloy applications |
Final performance depends on material grade, hardness, tool diameter, corner radius, machine rigidity, tool overhang and cutting parameters.
Technical Specifications
| Parameter | Specification |
| Series | HS(200) |
| Tool Type | 4 Flute Carbide Corner Radius End Mill |
| Flute Count | 4 |
| End Configuration | Corner Radius |
| Carbide Substrate | 0.2μm Ultra-Fine Grain Carbide |
| Coating | AlTiCrSiN Multi-Element PVD |
| Hardened Steel Capability | Up to 65 HRC |
| High-Temperature Performance | Approximately 1100°C+ according to supplied data |
| Cutting Modes | High-Speed / Dry / Semi-Dry / Coolant-Assisted |
| Recommended Materials | Hardened Steel, Mold Steel, Stainless Steel, Titanium Alloy, Nickel-Based Superalloy |
Key Dimensions
For a corner-radius end mill, selection should consider:
How to Select the Right Corner Radius
Match the Radius to the Part
The corner radius should correspond to the internal corner, transition or profile required on the workpiece.
Consider Edge Strength
A larger radius generally provides more material behind the cutting corner and can be useful where cutting loads are concentrated.
Maintain Feature Access
The selected radius must still fit the part geometry. A radius that is too large may prevent the tool from reaching the required feature.
Match the Radius to the Operation
For pocketing, side-wall machining, contouring and finishing, the appropriate radius depends on the component geometry and required surface profile.
Cutting Conditions
The HS(200) is intended for high-speed hard milling, but cutting conditions should be matched to the actual tool geometry and workpiece hardness.
Recommended cutting data can include:
For hard-milling applications, the starting parameters should consider:
Tool Diameter + Corner Radius + Workpiece Hardness + Machining Operation + Machine Rigidity
Customization
Custom configurations can be considered when standard diameter and corner-radius combinations do not match the required machining geometry.
Custom Options
Frequently Asked Questions
Can the HS(200) corner radius end mill machine hardened steel up to 65 HRC?
Yes. The HS(200) is designed for hardened steel applications up to 65 HRC under appropriate cutting conditions.
What is the advantage of a corner radius for hardened steel?
The rounded cutting corner provides additional edge support compared with a sharp square corner and can help reduce the risk of corner damage under concentrated cutting loads.
Is the HS(200) suitable for high surface-finish machining?
Yes. The HS(200) is intended for applications where surface quality is important, including hardened mold and die machining. Final results depend on machine rigidity, tool runout, engagement and cutting parameters.
Can the HS(200) be used for dry and semi-dry cutting?
Yes. High-speed dry and semi-dry cutting are key application modes, while coolant-assisted machining can also be used.
How should I choose the corner radius?
Select the radius according to the required part geometry and cutting conditions. A suitable radius should provide the required feature access while giving the cutting corner adequate support.
