CBN Square End Mill
For hardened-steel flat surfaces, shallow pockets, straight walls, shoulders and precision planar finishing.
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CBN END MILLS · HRC60+ · HIGH-PRECISION FINISHING
CBN End Mills for Hardened Material Finishing
ZHY CBN end mills are designed for precision finishing of hardened molds, high-hardness components and demanding applications requiring stable dimensional accuracy, long cutting-edge retention and fine surface quality.
The range uses the ZHY-developed NL900 CBN grade, controlled vacuum brazing, a 70% large-core design, a 20° helix and a 10° negative edge chamfer to support high-temperature stability and continuous finishing of materials above HRC60.
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NL900 CBN Grade
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For HRC60+ Materials
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Radius Accuracy 0.003–0.005 mm
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Surface Finish Ra 0.3 μm or Better
CBN End Mill Product Range
Select the cutting profile according to the machined surface, mold geometry, corner requirement and finishing toolpath.
CBN Ball Nose End Mill
For hardened mold cavities, curved surfaces, lamp molds, free-form profiles and high-precision three-dimensional finishing.
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CBN Corner Radius End Mill
For hardened pockets, shoulders, thin-wall parts and transition surfaces requiring reinforced corner strength and controlled radius accuracy.
Request SpecificationsRecommended CBN Finishing Applications
CBN end mills are primarily used after heat treatment, when the component has reached its final hardness and requires controlled stock removal with stable surface quality.
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Hardened Mold Finishing
Precision finishing of hardened mold cavities, inserts and detailed mold surfaces above HRC60.
02
Automotive Lamp Molds
Fine machining of headlamp molds requiring controlled radius accuracy and low surface roughness.
03
Thin-Wall Components
Low-stock finishing of thin sections where stable cutting pressure and dimensional consistency are important.
04
High-Precision Batch Production
Long cutting-edge retention supports automated production with fewer tool changes and stable part quality.
CBN Material and Tool Design Features
The CBN grade, brazing process, large-core geometry, edge preparation and precision grinding are designed specifically for high-hardness finishing applications.
NL900 CBN Material
The ZHY-developed NL900 grade uses an approximately 1.0 μm grain structure and a hardness specification of HV41 for finishing materials above HRC60.
Controlled Vacuum Brazing
The vacuum brazing process helps limit oxidation, decarburization and insert deformation while producing a stable joint between the CBN tip and tool body.
70% Large-Core Design
The approximately 70% core diameter increases tool rigidity and supports stable finishing of hard materials, slender features and precision mold surfaces.
20° Helix Geometry
The 20° helix is designed for controlled cutting engagement and stable chip formation during high-hardness finishing.
10° Negative Edge Chamfer
The negative chamfer strengthens the cutting edge, helps resist micro-chipping and supports longer tool life during finishing of hardened components.
CBN-Specific Grinding Wheels
Dedicated CBN grinding wheels are used to maintain cutting-edge sharpness, profile accuracy and consistent geometry.
R0.1 Minimum Tool Capability
Walter five-axis grinding supports small-radius CBN tools down to approximately R0.1 for detailed mold and micro-feature finishing.
Radius Accuracy of 0.003–0.005 mm
Controlled grinding and inspection support radius accuracy between approximately 0.003 and 0.005 mm, depending on tool size and profile.
Ra 0.3 μm or Better Surface Quality
Under suitable finishing conditions, the tool can support machined surface roughness of approximately Ra 0.3 μm or better.
High Thermal Stability
CBN retains hardness and cutting stability at elevated temperatures, making it suitable for continuous finishing of hardened ferrous materials.
Chemical Stability with Ferrous Materials
CBN offers greater chemical stability with iron-based materials than diamond cutting tools, supporting high-hardness steel finishing.
Long Cutting-Edge Retention
Under suitable finishing conditions, tool life may reach approximately 20 machining hours while maintaining stable edge quality and dimensional accuracy.
How to Select the CBN End Mill Profile
Select the cutting profile according to the final surface, corner geometry and machining path rather than choosing only by tool diameter.
Choose a Square End Mill For
- Flat mold surfaces
- Shallow pockets
- Straight side walls
- Shoulders and planar finishing
- Defined flat-bottom features
Choose a Ball Nose End Mill For
- 3D mold cavities
- Curved and free-form surfaces
- Automotive lamp molds
- Inclined and transition surfaces
- High-precision contour finishing
Choose a Corner Radius End Mill For
- Pocket-bottom transitions
- Reinforced cutting corners
- Thin-wall components
- Shoulders with a defined radius
- Semi-finishing and finishing
Recommended Workpiece Materials
CBN end mills are primarily intended for finishing hard materials after heat treatment. The exact grade and cutting parameters should be verified before production machining.
Hardened Steel Above HRC60
Quenched Mold Steel
High-Hardness Mold Inserts
Hardened Precision Components
Selected Graphite Mold Applications
Selected Nickel-Based Alloys
CBN tools are normally used for precision finishing with low and stable stock allowance. They are not generally intended for heavy roughing, interrupted cutting or unstable machining conditions.
CBN End Mill Technical Overview
Standard and customized CBN end mills can be supplied according to workpiece hardness, surface profile, finishing allowance and required tool reach.
| Product Types | Square End Mill / Ball Nose End Mill / Corner Radius End Mill |
|---|---|
| CBN Material Grade | NL900 |
| Grain Size | Approximately 1.0 μm |
| Hardness Specification | HV41 |
| Recommended Hardness | HRC60 and Above |
| Brazing Process | Controlled Vacuum Brazing |
| Core Diameter | Approximately 70% |
| Helix Angle | 20° |
| Edge Preparation | 10° Negative Chamfer |
| Minimum Radius Capability | Approximately R0.1 |
| Radius Accuracy | Approximately 0.003–0.005 mm |
| Surface Finish Capability | Approximately Ra 0.3 μm or Better |
| Main Applications | Hardened Mold Finishing / Lamp Molds / Thin-Wall Components / 3D Contours / High-Precision Batch Production |
| Dimensions | Standard Sizes / Small Radius / Long Reach / Custom Dimensions |
| OEM Options | Custom Dimensions / Laser Marking / Customer Model Number / Private Label |
Production and Precision Inspection
Precision grinding, controlled brazing and profile inspection support consistent cutting geometry and repeatable finishing performance across production batches.
NL900 Material Verification
Vacuum Brazing Control
Walter Five-Axis Grinding
Negative Chamfer Inspection
Tool Profile Measurement
Ball and Corner Radius Inspection
Cutting-Edge Appearance Inspection
Final Packaging Inspection
CBN End Mill Manufacturer and OEM Supplier
ZHY supplies standard and customized CBN end mills for cutting-tool distributors, mold manufacturers, precision machining companies and private-label tool brands.
Application and Wholesale Support
- Square, ball nose and corner radius profiles
- Small-radius tools down to approximately R0.1
- Standard and long-reach configurations
- Application review based on hardness and allowance
- Sample tools for machining verification
- Mixed-size and batch-order quotations
OEM and Private Label
- Customized diameter and radius
- Customer logo laser marking
- Customer model and product numbers
- Custom labels and barcode stickers
- Private-label tool packaging
- Packaging verification before shipment
Request a CBN End Mill Recommendation
Send us the workpiece material, final hardness, tool profile, diameter, corner or ball radius, machining allowance, required surface finish, tool reach and order quantity. Our team will review the finishing application and recommend a suitable standard or customized CBN end mill.
Request a CBN Tool Quote