MH(350) 4 flute long neck corner radius end mill with 0.3–0.4μm ultra-fine carbide and AlCrN coating for deep grooves, recessed features and difficult-material machining up to 52 HRC.
The MH(350) 4 flute long neck corner radius end mill is designed for machining features that require both extended reach and a reinforced cutting corner.
The long-neck configuration provides clearance for recessed areas and deeper features, while the corner radius supports the cutting edge in pocket, shoulder and profile operations. A 0.3–0.4μm ultra-fine carbide substrate and AlCrN PVD coating make the tool suitable for stainless steel, copper, titanium alloys and hardened steel up to 52 HRC.
The tool can be used for high-speed, dry and coolant-assisted machining according to the workpiece and cutting conditions.
Key Features
Where the Geometry Adds Value
The combination of a long neck and corner radius makes this tool different from both a standard square end mill and a conventional corner-radius cutter.
Deep Pocket Machining
The long neck provides additional clearance when the machining feature sits below the surrounding workpiece surface.
Profile and Shoulder Work
The corner radius supports the cutting edge during side-wall and profile operations where the tool corner is repeatedly engaged.
Recessed Mold Features
Suitable for deep pockets, ribs and other restricted features where tool access and corner strength need to be considered together.
Difficult-Material Milling
The MH(350) combines the geometry with a fine-grain carbide substrate and AlCrN coating for applications involving stainless steel, titanium alloys and hardened steel.
Corner Radius for Edge Support
A rounded cutting corner changes the way the end and side edges meet the workpiece.
Stronger Corner Transition
Compared with a sharp square corner, the radius provides additional material behind the cutting edge and can improve resistance to localized corner loading.
Better Fit for Profiles
The radius can also be used to create controlled transitions on the workpiece rather than a sharp internal corner.
Match the Radius to the Part
The selected radius must correspond to the required component geometry. A radius that is too large can limit feature access, while an unnecessarily small radius may provide less corner reinforcement.
Corner-radius tooling is commonly used where edge strength and resistance to corner damage are important, while long-neck versions add access for recessed and deep features.
Long Neck for Deep and Restricted Features
The long-neck section is primarily a clearance feature rather than simply an increase in overall length.
Reach
It allows the cutting portion to access deeper machining areas.
Clearance
The reduced neck helps prevent interference between the tool body and surrounding walls or shoulders.
Effective Length
The effective length should be selected according to the actual machining depth. Excessive extension can reduce rigidity and increase deflection.
Tool Stability
For deep machining, use the shortest practical unsupported length and maintain accurate toolholding.
Material Applications
| Workpiece Material | Application Focus |
| Stainless Steel | Deep pockets, profiles and shoulder milling |
| Copper | Precision recessed features |
| Titanium Alloy | Restricted difficult-material machining |
| Hardened Steel ≤52 HRC | Deep and controlled milling |
| Other Difficult Materials | Application dependent |
Actual performance depends on material grade, hardness, tool diameter, corner radius, effective length, tool overhang and machine rigidity.
AlCrN Coating and Ultra-Fine Carbide
The MH(350) combines two material technologies that support its intended machining range.
0.3–0.4μm Ultra-Fine Carbide
The fine-grain carbide substrate provides the hardness and wear resistance required for a small-radius cutting corner and demanding workpiece materials.
AlCrN PVD Coating
The coating is designed for high-temperature oxidation resistance and supports cutting performance under demanding thermal conditions.
Adhesion Control
The AlCrN coating also helps reduce material adhesion when machining stainless steel, where built-up edge can affect cutting consistency.
The supplied product data specifies approximately 1000°C high-temperature performance for the coating system. This refers to coating performance rather than an actual cutting temperature.
Technical Specifications
| Parameter | Specification |
| Series | MH(350) |
| Tool Type | 4 Flute Long Neck Carbide Corner Radius End Mill |
| Flute Count | 4 |
| End Configuration | Corner Radius |
| Tool Design | Long Neck |
| Carbide Substrate | 0.3–0.4μm Ultra-Fine Grain Carbide |
| Coating | AlCrN PVD |
| Hardened Steel Capability | Up to 52 HRC |
| Cutting Modes | High-Speed / Dry / Coolant-Assisted |
| Recommended Materials | Stainless Steel, Copper, Titanium Alloy, Hardened Steel |
Key Dimensions
The following dimensions should be evaluated together when selecting the tool:
Commercial long-neck corner-radius ranges likewise treat cutting diameter, corner radius, effective length and overall length as core selection dimensions.
How to Select the Right Tool
Start With the Feature
Determine the actual machining depth, pocket width and surrounding wall clearance.
Choose the Corner Radius
Match the radius to the required part geometry and desired corner transition.
Select the Cutting Diameter
Choose a diameter that fits the feature while providing sufficient cutting strength.
Check Effective Length
Use the shortest effective length that reaches the required feature.
Minimize Overhang
Keep the unsupported tool length as short as practical to limit vibration and deflection.
Cutting Conditions
Because this tool combines extended reach with a reinforced corner, cutting parameters should be matched to both geometry and machining depth.
Recommended data can include:
For a suitable starting point, provide:
Tool Diameter + Corner Radius + Effective Length + Workpiece Material + Hardness
Customization
Custom configurations are available when the standard diameter, radius or effective length does not match the machining requirement.
Custom Options
Frequently Asked Questions
What is a 4 flute long neck corner radius end mill used for?
It is designed for deep grooves, recessed pockets, profiles and shoulder features where both extended reach and a reinforced cutting corner are required.
What is the advantage of combining a long neck with a corner radius?
The long neck provides access and clearance for deeper features, while the corner radius provides additional support at the cutting corner.
Can the MH(350) machine stainless steel?
Yes. Stainless steel is one of the main application materials, and the AlCrN coating helps reduce material adhesion during machining.
Can it machine hardened steel up to 52 HRC?
Yes. The MH(350) is suitable for hardened steel applications up to 52 HRC with appropriate cutting conditions.
How should I choose the corner radius and effective length?
Choose the corner radius according to the part geometry and the effective length according to the actual machining depth. Avoid unnecessary tool extension to maintain rigidity.
