MH(350) 2 flute micro long neck carbide square end mill with 0.3–0.4μm ultra-fine carbide and AlCrN PVD coating for deep, narrow features in stainless steel, titanium and hardened steel up to 52 HRC.
The MH(350) 2 flute micro long neck end mill is designed for precision machining of small, deep and difficult-to-access features.
Its micro-diameter cutting geometry provides access to narrow features, while the long neck section creates additional clearance for deep grooves, recessed pockets and cavities. A 0.3–0.4μm ultra-fine carbide substrate combined with AlCrN PVD coating supports high-speed machining and helps control heat, wear and material adhesion in demanding applications.
Product Highlights
Where This Tool Fits
Deep Micro Grooves
The small cutting diameter combined with extended neck clearance makes the MH(350) suitable for narrow grooves where a conventional tool cannot reach effectively.
Recessed Pockets
The reduced-neck section provides clearance around deep pocket features and helps minimize interference between the tool body and workpiece.
Small Mold Features
Suitable for small cavities, ribs, pockets and inserts where both tool size and machining depth need to be considered.
Deep Hardened-Steel Features
The MH(350) combines micro geometry with a 52 HRC material capability, making it suitable for selected deep features in hardened steel.
Difficult Materials
The tool can also be used for stainless steel, titanium alloys, copper and other challenging materials under suitable cutting conditions.
Micro Long Neck Geometry
The cutting performance of a micro long neck end mill depends on more than diameter alone.
Micro Cutting Diameter
A small cutting diameter allows access to narrow features and miniature geometries that larger tools cannot machine.
Reduced Neck
The relieved neck provides clearance behind the cutting section, allowing the tool to enter deeper features without unnecessary body interference.
Compact Cutting Section
Keeping the cutting section focused on the actual machining depth can help avoid excessive flute length and unnecessary cutting load.
Controlled Tool Reach
The effective length should be selected according to the real machining depth. Extra reach increases sensitivity to vibration and deflection.
Long-neck square end mills are commonly used for deep grooves, recessed pockets, flat-bottom cavities and narrow features, with neck diameter, effective length and overall length serving as important selection variables.
Why the 2-Flute Design Matters
For micro and deep-feature machining, the number of flutes affects chip space and cutting behavior.
More Flute Space
Two flutes leave more open space around the cutting zone, which can support chip evacuation in narrow or deeper features.
Suitable for Micro Tools
The 2-flute layout is well suited to small-diameter tooling where chip packing can quickly affect tool stability.
Controlled Engagement
Fewer cutting edges allow the cutting load to be managed carefully in precision milling applications.
Commercial micro long-neck products also commonly combine 2 flutes with deep-cavity applications for this reason.
Material Applications
Hardened Steel
The MH(350) is suitable for hardened steel up to 52 HRC, particularly for small and deep features where tool access is limited.
Stainless Steel
The AlCrN coating helps reduce material adhesion and built-up edge during stainless steel micro milling.
Titanium Alloys
Suitable for selected precision applications where heat generation and tool wear need to be controlled.
Copper
Suitable for small-feature machining in copper when the tool geometry and cutting parameters are properly matched.
Material Compatibility
| Workpiece Material | Application Focus |
| Hardened Steel ≤52 HRC | Deep micro cavities, grooves and precision features |
| Stainless Steel | Small features and restricted machining |
| Titanium Alloy | Precision difficult-material machining |
| Copper | Micro features and controlled milling |
| Other Difficult Materials | Application dependent |
Actual performance depends on material grade, hardness, tool diameter, effective length, machine rigidity, tool overhang and cutting conditions.
MH(350) Tool Technology
0.3–0.4μm Ultra-Fine Carbide
The ultra-fine substrate is designed for demanding micro applications requiring high hardness, wear resistance and stable edge performance.
AlCrN PVD Coating
The AlCrN coating provides high-temperature oxidation resistance and thermal stability for applications exposed to elevated cutting temperatures.
Specialized Tool Geometry
The MH(350) geometry is designed around the combined requirements of micro machining and extended reach rather than simply extending a standard square end mill.
Anti-Adhesion Performance
The coating helps limit material adhesion, particularly when machining stainless steel.
Technical Specifications
| Parameter | Specification |
| Series | MH(350) |
| Tool Type | 2 Flute Micro Long Neck Carbide Square End Mill |
| Flute Count | 2 |
| End Type | Square |
| Design | Micro Long Neck |
| Carbide Substrate | 0.3–0.4μm Ultra-Fine Grain Carbide |
| Coating | AlCrN PVD |
| Hardened Steel | Up to 52 HRC |
| Cutting Modes | High-Speed / Dry / Coolant-Assisted |
| Recommended Materials | Hardened Steel, Stainless Steel, Titanium Alloy, Copper |
Key Dimensions
For micro long-neck applications, the following dimensions should be evaluated together:
Selecting the Right Configuration
Start With Feature Width
Determine the smallest feature that must be machined before selecting the cutting diameter.
Define the Required Depth
Choose the effective length based on the actual machining depth rather than overall tool length.
Minimize Unsupported Length
Use the shortest practical reach to reduce deflection and vibration.
Check Neck Clearance
Make sure the reduced neck is long enough to clear surrounding walls without creating unnecessary tool extension.
Confirm Material and Hardness
For hardened steel, verify that the workpiece is within the 52 HRC application range before setting cutting conditions.
Cutting Conditions
Because micro long-neck tools are sensitive to tool deflection and vibration, cutting data should be selected according to the complete tool configuration rather than diameter alone.
Recommended cutting information can include:
For a recommendation, provide your:
Tool Diameter + Effective Length + Material + Hardness + Machining Depth
Custom Micro Long Neck End Mills
When standard sizes do not provide the required reach or feature access, JimmyTool can manufacture custom configurations.
Custom Options
Frequently Asked Questions
What is the MH(350) 2 flute micro long neck end mill used for?
It is designed for small, deep and restricted machining features such as micro grooves, recessed pockets, miniature cavities and narrow mold features.
Why combine a micro diameter with a long neck?
The micro diameter provides access to small features, while the long neck creates clearance for deeper machining areas.
Is the MH(350) suitable for hardened steel?
Yes. It is suitable for hardened steel up to 52 HRC under appropriate cutting conditions.
Can it machine stainless steel?
Yes. The MH(350) is suitable for stainless steel, particularly where small features and material adhesion are concerns.
Can the MH(350) machine titanium alloys?
Yes. Titanium alloy machining is supported when the tool configuration and cutting parameters are properly selected.
Why does tool overhang matter?
Micro long-neck tools are more sensitive to deflection and vibration as unsupported length increases. Keeping the tool extension as short as practical improves stability.
Can the MH(350) be used for dry machining?
Yes. It can be used for dry cutting or coolant-assisted machining depending on the workpiece and machining conditions.
Can JimmyTool customize the tool?
Yes. Cutting diameter, flute length, effective length, neck dimensions, shank size, geometry and coating can be customized.
