Description
Product Overview
This carbide corner radius end mill is designed for side milling,
cavity-bottom machining, contour finishing and controlled
semi-finishing of hardened mold, die and tool steels in the
HRC60–68 hardness range.
The reinforced corner radius improves cutting-edge strength compared
with a sharp square corner while retaining a flat-bottom cutting
profile. A 0.4 μm ultra-fine carbide substrate, DR3 bronze coating,
68% reinforced core and 35° helix geometry support stable machining
of high-hardness components.
Recommended Machining Applications
The combination of a flat-bottom profile and reinforced corner radius
supports hardened steel machining where bottom flatness, edge strength
and stable contour finishing are required.
Side Semi-Finishing
Suitable for controlled stock removal from hardened steel
walls, side surfaces and external profiles before final finishing.
Cavity-Bottom Machining
Designed for pocket bottoms and cavity features requiring
a flat cutting profile with a controlled corner transition.
Contour Finishing
Supports stable peripheral machining along hardened mold
profiles, transitions and complex outlines.
Corner and Radius Finishing
Suitable for finishing bottom-edge radii and internal
transitions where repeatable corner geometry is required.
Corner Radius End Mill for HRC65 Mold Steel
This product is suitable for controlled semi-finishing and finishing
of hardened mold steels around HRC65. Selection should be based on
the actual measured hardness, required corner radius, tool overhang
and machining rigidity.
Recommended Conditions
- Controlled semi-finishing and finishing
- Rigid machine and toolholding system
- Low spindle and holder runout
- Short and stable tool overhang
- Consistent machining allowance
- Stable side or contour toolpaths
Selection Notes
- Confirm the actual hardness after heat treatment
- Select the corner radius according to the part profile
- Reduce engagement as workpiece hardness increases
- Long-reach tools require stricter stability control
- Avoid excessive radial cutting engagement
- Provide application details before ordering
Corner Radius Geometry and Cutting Performance
The carbide substrate, wear-resistant coating, reinforced core,
precision corner radius and controlled edge preparation work
together to support stable HRC60–68 machining.
0.4 μm Ultra-Fine Carbide
The carbide substrate uses imported ultra-fine powder
with an approximate grain size of 0.4 μm, supporting
high hardness, wear resistance and consistent cutting edges.
9% Cobalt Content
A 9% cobalt content balances carbide hardness,
cutting-edge strength and fracture resistance during
high-hardness steel machining.
DR3 Bronze Wear-Resistant Coating
The bronze-colored DR3 coating helps resist cutting heat
and abrasive wear at operating temperatures up to
approximately 1300°C.
68% Reinforced Core
The large 68% core diameter improves cutter rigidity
and helps reduce tool deflection and vibration during
hardened steel side and contour machining.
Reinforced Corner Radius
The corner radius reduces stress concentration at the
cutting tip and improves edge strength compared with
a sharp square-end corner.
Flat-Bottom Cutting Profile
The flat-bottom geometry supports cavity bottoms,
shoulders and planar features while the corner radius
provides additional cutting-edge support.
35° Helix Geometry
The 35° helix supports stable engagement during
side milling, cavity machining, contouring and
bottom-edge radius finishing.
0° to −5° Peripheral Rake
The controlled negative peripheral rake strengthens
the cutting edge and helps reduce premature chipping
during high-hardness machining.
Corner Radius Accuracy of 0.003–0.005 mm
Walter five-axis precision grinding controls the corner
radius accuracy to approximately 0.003–0.005 mm for
repeatable cavity, transition and contour machining.
Automated Edge Honing
Automated rubber-bonded diamond polishing helps maintain
consistent preparation across all cutting edges, with
the honing value controlled within ±3 μm.
Standard Corner Radius End Mill Sizes
Standard metric sizes, standard corner radii, long-reach tools
and customized dimensions are available for hardened steel
machining and wholesale supply.
| Tool Diameter | Standard Metric Sizes / Custom Diameter |
|---|---|
| Corner Radius | Standard Radius / Custom Radius |
| Flute Length | Standard / Long Reach / Custom |
| Neck Length | Standard / Extended / Custom |
| Shank Diameter | Standard Shank / Custom Shank |
| Overall Length | Standard / Extended Length / Custom |
| Flute Options | 4 Flutes / Custom |
Send us the required diameter, corner radius, flute length,
neck length, shank diameter, overall length, workpiece
hardness and order quantity to receive the current size
list and quotation.
Available Configurations
Standard and customized carbide corner radius end mills can be
supplied according to the actual workpiece hardness, part geometry,
required radius, tool overhang and finishing requirements.
| Tool Type | Carbide Corner Radius End Mill |
|---|---|
| Flute Options | 4 Flutes / Custom |
| Carbide Grain Size | Approximately 0.4 μm |
| Cobalt Content | 9% |
| Coating | DR3 Bronze High-Wear-Resistant Coating |
| Temperature Resistance | Up to Approximately 1300°C |
| Core Diameter | 68% Reinforced Core Design |
| Peripheral Rake | 0° to −5° |
| Helix Angle | 35° |
| Edge Preparation |
Automated Diamond Polishing, Controlled Within ±3 μm |
| Corner Radius Accuracy | Approximately 0.003–0.005 mm |
| Hardness Range | Recommended for HRC60–68 Hardened Steel |
| Diameter and Length |
Standard Sizes / Long Reach / Custom Dimensions |
| Marking |
ZHY Logo / Customer Logo / Customer Model Number |
| Packaging |
Standard Packaging / Private-Label Packaging |
Recommended Workpiece Materials
This carbide corner radius end mill is mainly recommended
for controlled semi-finishing and finishing of workpieces
with actual measured hardness in the HRC60–68 range.
Wholesale and OEM Support
ZHY supplies standard and customized carbide corner radius
end mills for distributors, importers, mold manufacturers,
CNC workshops and private-label cutting-tool brands.
Wholesale Order Support
- Standard and mixed-size orders
- Standard and customized corner radii
- Samples for hardened steel machining tests
- Bulk quotations based on size and quantity
- Long-reach and customized dimensions
- Application review based on actual HRC hardness
OEM and Private Label
- Customer logo laser marking
- Customer product and model numbers
- Custom labels and barcode stickers
- Plastic box and outer carton options
- Private-label packaging support
- Packaging verification before shipment
Production and Corner Radius Inspection
Precision grinding, controlled edge honing and corner-radius
inspection support consistent geometry and repeatable batch delivery.
Request a Hardened Steel Corner Radius End Mill Quotation
Send us the required diameter, corner radius, flute length,
overall length, workpiece grade, actual HRC hardness,
machining feature, quantity and packaging requirements.
Our team will review the application and provide a suitable quotation.
