HS(200) 4 flute long neck carbide square end mill with 0.2μm ultra-fine carbide and AlTiCrSiN coating for deep grooves, cavities and restricted machining in hardened steel up to 65 HRC.
The HS(200) 4 flute long neck end mill is designed for deep and restricted machining in hardened steel and mold steel where a standard-length cutter cannot provide sufficient reach.
Its long neck configuration provides additional clearance behind the cutting section, while the 0.2μm ultra-fine carbide substrate, AlTiCrSiN multi-element PVD coating and specialized geometry are designed for high-speed machining of hardened materials up to 65 HRC.
The HS(200) supports dry, semi-dry and coolant-assisted machining and is also suitable for selected stainless steel, titanium alloy and nickel-based high-temperature alloy applications.
Product Highlights
Deep Machining Applications
Deep Grooves
The long neck structure provides additional reach for deep slots and grooves where a standard end mill may not provide enough clearance.
Deep Mold Cavities
The HS(200) is suited to recessed mold features where the cutting edge must reach deeper into the workpiece while avoiding interference from the tool body.
Narrow Ribs and Walls
The reduced neck provides clearance around narrow ribs, deep walls and other restricted mold features.
Hardened Mold Components
The tool combines long-neck access with a hardened-steel capability up to 65 HRC, making it suitable for deep sections of hardened molds and dies.
Long-neck square end mills are commonly positioned for deep grooves, recessed pockets and mold features, while effective length and neck dimensions are critical for determining reach and stability.
Long Neck Geometry and Tool Reach
For this product, the long neck is the key functional difference from the standard HS(200) square end mill.
Additional Clearance
The reduced-neck section allows the cutting edge to enter recessed features without requiring the entire tool body to enter the machining area.
Extended Effective Length
The effective length should be selected according to the actual machining depth rather than simply choosing the longest available tool.
Narrow Feature Access
The long-neck structure is useful where surrounding walls, ribs or shoulders restrict conventional tool access.
Rigidity Matters
Longer unsupported sections are more sensitive to deflection and vibration. The shortest practical effective length and tool overhang should be used for stable machining.
Industrial long-neck tool ranges also specify actual effective length, neck diameter and overall length separately because these dimensions directly affect deep-feature machining and rigidity.
65 HRC Hardened Steel Machining
The HS(200) is positioned for high-hardness machining rather than general-purpose milling.
Hardened Steel up to 65 HRC
The stated application range covers hardened steel up to 65 HRC, making the tool suitable for demanding hard-milling applications.
Mold Steel
The long-neck configuration is particularly useful for hardened mold and die sections where deep features must be reached after hardening.
High-Speed Machining
The ultra-fine carbide substrate, AlTiCrSiN coating and dedicated geometry are intended to support high-speed cutting under demanding thermal conditions.
Surface Finish
The HS(200) can also be used where machining quality and surface finish are important. Final finish depends on machine rigidity, runout, effective length, engagement and cutting parameters.
AlTiCrSiN Coating for High-Temperature Cutting
The AlTiCrSiN multi-element PVD coating is a key part of the HS(200)’s performance in hardened-material applications.
High-Temperature Performance
The supplied product data specifies performance in machining conditions above approximately 1100°C for the coating system.
Wear Protection
The hard PVD coating helps protect the carbide substrate against thermal and abrasive wear during high-speed machining.
Dry and Semi-Dry Cutting
The coating’s thermal characteristics make the HS(200) suitable for dry and semi-dry machining where coolant use is reduced or avoided.
Coolant-Assisted Machining
Coolant-assisted cutting can also be used when required by the workpiece, machine setup or machining process.
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.
Material Applications
| Workpiece Material | Application Focus |
| Hardened Steel ≤65 HRC | Deep grooves, cavities and mold features |
| Mold Steel | Deep hardened mold and die machining |
| Stainless Steel | Selected deep and restricted machining |
| Titanium Alloy | Difficult-material applications |
| Nickel-Based Superalloy | Selected high-temperature alloy machining |
Actual performance depends on material grade, hardness, tool diameter, effective length, tool overhang, machine rigidity and cutting conditions.
Technical Specifications
| Parameter | Specification |
| Series | HS(200) |
| Tool Type | 4 Flute Long Neck Carbide Square End Mill |
| Flute Count | 4 |
| End Type | Square |
| Design | Long Neck |
| 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 |
Critical Dimensions
For long-neck machining, the following dimensions should be considered together:
Selecting the Right HS(200) Configuration
Define the Machining Depth
Measure the actual feature depth and select the shortest effective length that provides the required reach.
Select the Cutting Diameter
Choose a diameter that fits the feature while maintaining sufficient tool strength for the hardened material.
Check Neck Clearance
Make sure the neck provides adequate clearance around walls, ribs and shoulders.
Control Tool Overhang
Longer unsupported length increases sensitivity to vibration and deflection, which can affect both dimensional accuracy and surface finish.
Consider the Hardness
For hardened steel applications, verify that the workpiece is within the stated 65 HRC range before selecting cutting parameters.
Cutting Conditions
The HS(200) is designed for high-speed machining, but long-neck applications require more careful control of cutting load and rigidity than standard-length tooling.
Recommended cutting data can include:
The appropriate parameters depend on:
Tool Diameter + Effective Length + Workpiece Hardness + Machining Depth + Machine Rigidity
Customization
Customized long-neck configurations can be considered when standard sizes do not provide the required reach or clearance.
Custom Options
Frequently Asked Questions
What is the HS(200) 4 flute long neck end mill used for?
It is designed for deep grooves, recessed cavities, narrow ribs and other restricted features in hardened and mold steels.
Can the HS(200) 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.
Why use a long neck end mill for hardened mold steel?
The long neck provides additional clearance and reach for deep mold features that cannot be accessed effectively with a standard-length cutter.
Is the HS(200) suitable for dry machining?
Yes. High-speed, dry and semi-dry machining are key applications, while coolant-assisted cutting can also be used.
Can the HS(200) be used for stainless steel, titanium and nickel-based alloys?
Yes. These materials are also within the stated application scope, although the cutting parameters should be adjusted to the specific material and machining condition.
