The HH(300) Micro Diameter Long Neck 2 Flute Ball Nose End Mill combines 0.3 μm ultra-fine grain carbide with a TiSiN PVD coating for precision machining. Designed for deep, narrow features in hardened steel up to 60 HRC, mold steel, titanium alloys, and nickel-based superalloys.
The HH(300) Micro Diameter Long Neck 2 Flute Ball Nose End Mill is designed for precision machining where both a small cutting diameter and extended reach are required.
Its micro-diameter ball nose profile is suited to small cavities, narrow features, and fine 3D contours that larger tools cannot easily access.
The long neck provides additional clearance for deeper recessed areas while helping the cutting edge reach difficult-to-machine features.
Micro Diameter Design for Precision Features
Small-diameter ball nose end mills are commonly used for machining fine details that require controlled tool engagement and accurate surface definition.
The HH(300) is suitable for precision mold components, small cavities, narrow grooves, and detailed 3D surfaces.
Its micro geometry makes it a practical choice when a standard-diameter ball nose end mill is too large for the required feature.
Long Neck for Deep and Recessed Areas
The long neck configuration extends the tool’s working reach without using a larger cutting diameter.
This helps the HH(300) reach deep cavities and recessed features while providing additional clearance around the workpiece.
Tool overhang should still be selected carefully according to the required reach, machine rigidity, tool diameter, and cutting conditions.
Key Features
0.3 μm Ultra-Fine Grain Carbide
The 0.3 μm ultra-fine grain carbide substrate provides a stable cutting edge for precision machining.
It is suitable for demanding applications where a small cutting edge must maintain wear resistance and dimensional stability.
TiSiN PVD Coating
The TiSiN composite PVD coating provides high coating hardness and strong resistance to elevated cutting temperatures.
Its high-temperature performance is approximately 1200°C, supporting demanding high-speed, dry, and semi-dry machining.
Micro-Diameter Ball Nose Profile
The small-diameter ball nose configuration is designed for detailed machining and fine surface features.
It is especially useful for precision mold and die work where small radii and narrow geometries need to be machined accurately.
Designed for Hardened Steel up to 60 HRC
The HH(300) is suitable for machining hardened steel and mold steel up to 60 HRC.
The ultra-fine carbide substrate and TiSiN coating are designed to withstand the demanding conditions associated with hard-material machining.
High-Speed Dry and Semi-Dry Machining
The tool is optimized for high-speed dry and semi-dry cutting.
This makes it suitable for applications where coolant use is limited or where thermal performance is an important tool-selection factor.
Machining Problems the HH(300) Helps Solve
Small Features Are Difficult to Reach
Larger ball nose end mills may not fit into narrow or detailed features.
The micro-diameter cutting profile allows the HH(300) to machine smaller geometries with greater tool access.
Deep Cavities Require Additional Reach
Deep recessed areas can create clearance problems with standard tool configurations.
The long neck provides additional working clearance for deep cavity and recessed-feature machining.
Micro Tools Need Edge Stability
Small cutting diameters are more sensitive to wear and cutting instability.
The fine-grain carbide substrate is designed to support a stable cutting edge during precision machining.
Heat During Hard and Dry Machining
Hardened steel and dry cutting can generate substantial heat at the cutting edge.
The TiSiN coating provides high-temperature resistance for demanding machining conditions.
Recommended Materials
The HH(300) is suitable for:
The actual tool configuration should be selected according to workpiece hardness, feature size, required reach, machine rigidity, and cutting conditions.
Typical Applications
The HH(300) Micro Diameter Long Neck Ball Nose End Mill is suitable for:
It is particularly useful for small and deep features where a standard ball nose end mill cannot provide the required access.
Technical Specifications
| Specification | Details |
| Product Series | HH(300) |
| Tool Type | Micro Diameter 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) Micro Diameter Design?
The HH(300) is suited to applications where fine feature size and tool reach are more important than general-purpose cutting capacity.
Its micro-diameter ball nose profile handles small geometries, while the long neck provides additional access to deep or recessed areas.
The TiSiN coating and ultra-fine carbide substrate further support high-speed machining of hardened and difficult-to-machine materials.
Custom Micro Ball Nose End Mills
Micro-machining applications often require specific tool diameters, neck lengths, 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 for tool dimensions, geometry, coating, carbide grade, and other application-specific requirements.
For a custom inquiry, provide the workpiece material, hardness, required tool diameter, reach, machining conditions, quantity, and drawing or sample where available.
FAQ
What is a micro-diameter ball nose end mill used for?
A micro-diameter ball nose end mill is used for small cavities, narrow features, fine 3D contours, and other precision machining applications where a standard-size tool is too large.
What is the advantage of the long neck design?
The long neck provides additional reach and clearance for deep cavities and recessed features while retaining a small cutting diameter.
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.
Can JimmyTool customize this micro ball nose end mill?
Yes. JimmyTool can manufacture custom carbide ball nose end mills based on drawings, samples, or specific machining requirements.
Request a Quote for HH(300)
Need a micro diameter long neck ball nose end mill for a small cavity, deep feature, or hardened mold-steel application?
Send us the required tool diameter, reach, workpiece material, hardness, machining conditions, and quantity.
For non-standard requirements, a drawing or sample can also be provided so the appropriate tool geometry can be reviewed.
