The HH(300) Long Neck 2 Flute Ball Nose End Mill combines 0.3 μm ultra-fine grain carbide with a TiSiN PVD coating. Designed for deep cavity and hard-to-reach machining of hardened steel up to 60 HRC, it also performs in dry or semi-dry cutting of mold steel, titanium alloys, and nickel-based superalloys.
The HH(300) Long Neck 2 Flute Ball Nose End Mill is designed for machining deep cavities, recessed features, and complex 3D surfaces where a standard ball nose end mill may not provide sufficient reach.
Its long neck configuration extends cutting access while helping reduce interference with surrounding workpiece features. This makes it well suited to mold and die applications with deep or difficult-to-reach areas.
The tool uses a 0.3 μm ultra-fine grain carbide substrate with a high-performance TiSiN PVD coating. The combination is designed for demanding high-speed machining of hardened and difficult-to-machine materials.
Long Neck Design for Deep and Narrow Features
The extended neck provides additional clearance between the cutting edge and the tool holder.
This makes the HH(300) suitable for deep cavities, recessed areas, narrow features, and complex mold geometries where tool access is limited.
A long neck does not simply add cutting length. The tool must still be selected according to the required reach, workpiece geometry, machine setup, and cutting conditions to control deflection and maintain stability.
Key Features & Benefits
0.3 μm Ultra-Fine Grain Carbide
The HH(300) uses 0.3 μm ultra-fine grain carbide for a stable cutting edge and strong wear resistance.
This substrate is suitable for high-speed machining and demanding applications involving hardened materials.
TiSiN PVD Coating
The TiSiN PVD coating provides high coating hardness and strong resistance to elevated cutting temperatures.
Its high-temperature performance is approximately 1200°C, making it suitable for demanding dry and semi-dry machining conditions.
2-Flute Ball Nose Profile
The 2-flute ball nose design is suitable for 3D contouring, curved surfaces, profiling, and finishing.
The ball profile allows the tool to follow complex surface geometries commonly found in molds, dies, and precision components.
Designed for Hardened Steel up to 60 HRC
The HH(300) is developed for machining hardened steel and mold steel up to 60 HRC.
Its carbide substrate and TiSiN coating are designed to withstand the mechanical and thermal demands associated with hard-material machining.
High-Speed Dry and Semi-Dry Cutting
The HH(300) is particularly suitable for high-speed dry and semi-dry machining.
This makes it a practical choice for applications where coolant use needs to be reduced or where a dry cutting process is preferred.
Machining Problems the HH(300) Helps Solve
Limited Tool Access in Deep Cavities
Standard-length end mills may not reach recessed areas without interference from the holder or shank.
The long neck configuration provides additional access for deep cavity and hard-to-reach machining.
Tool Wear in Hardened Mold Steel
Hardened steel generates high loads and heat at the cutting edge.
The combination of ultra-fine grain carbide and TiSiN coating is designed to provide the durability required for machining materials up to 60 HRC.
Heat During Dry Machining
Dry cutting can increase thermal stress on the cutting edge.
The TiSiN coating offers high-temperature resistance to help maintain tool performance under demanding cutting conditions.
Difficult-to-Machine Alloys
Titanium alloys and nickel-based superalloys can generate substantial heat and accelerate tool wear.
The HH(300) provides a high-hardness coated option for high-speed machining of these demanding materials.
Recommended Materials
The HH(300) is suitable for:
Material condition, hardness, tool diameter, reach, machine rigidity, and cutting parameters should be considered when selecting the appropriate tool configuration.
Typical Applications
The HH(300) Long Neck Ball Nose End Mill is suitable for:
The long neck design is particularly useful when additional tool clearance is required to reach deep or recessed features.
Technical Specifications
| Specification | Details |
| Product Series | HH(300) |
| Tool Type | Long Neck Ball Nose End Mill |
| Number of Flutes | 2 |
| Substrate | Ultra-Fine Grain Carbide |
| Carbide Grain Size | 0.3 μm |
| Coating | TiSiN Composite PVD Coating |
| High-Temperature Performance | Approx. 1200°C |
| Hardened Steel Hardness | Up to 60 HRC |
| Cutting Methods | High-Speed, Dry, Semi-Dry |
| Suitable Materials | Hardened Steel, Mold Steel, Titanium Alloys, Nickel-Based Superalloys |
Why Choose the HH(300) Long Neck Design?
The main advantage of the HH(300) is its combination of extended access and high-hardness machining capability.
It is a suitable option when a standard ball nose end mill cannot safely reach a deep or recessed feature, particularly in hardened mold steel applications.
The TiSiN coating and ultra-fine carbide substrate further support high-speed machining under dry or semi-dry conditions.
Custom Long Neck Ball Nose End Mills
Different workpieces may require specific neck lengths, tool diameters, cutting lengths, or other geometry.
JimmyTool supports custom carbide ball nose end mills based on customer drawings, samples, and machining requirements.
Custom solutions can be developed according to the required tool geometry, dimensions, coating, carbide grade, and application.
For a custom inquiry, provide the workpiece material, hardness, required reach, tool diameter, machining conditions, quantity, and drawing or sample where available.
FAQ
What is the advantage of a long neck ball nose end mill?
A long neck configuration provides additional clearance and reach for deep cavities, recessed features, and other areas that are difficult to access with a standard-length tool.
Can the HH(300) machine hardened steel up to 60 HRC?
Yes. The HH(300) is designed for hardened steel and mold steel applications up to 60 HRC.
Is it suitable for dry and semi-dry machining?
Yes. The HH(300) is designed for high-speed dry and semi-dry cutting and can also be used with coolant when required by the machining process.
Can JimmyTool customize the long neck ball nose end mill?
Yes. JimmyTool can provide custom carbide ball nose end mills based on drawings, samples, or specific machining requirements.
Request a Quote for HH(300)
Need a long neck ball nose end mill for deep cavity machining or hardened steel up to 60 HRC?
Send us your tool diameter, required reach, workpiece material, hardness, machining method, cutting conditions, and quantity.
For non-standard requirements, a drawing or sample can also be provided for review. JimmyTool can recommend a suitable HH(300) configuration or develop a custom long neck ball nose end mill for your application.
