4-Flute Stub-Length Solid Carbide Internal-Radius End Mill for Steel
This 4-flute stub-length solid carbide internal-radius end mill is designed for precision radius profiling, mold details and smooth curved transitions in steel machining. Its compact tool length helps improve rigidity and machining stability, while the 4-flute cutting geometry supports consistent radius formation and smooth profile finishing on CNC machining centers.
- ◆Form-ground internal-radius profile for consistent corner and transition geometry
- ◆Stub-length design provides a compact, rigid setup for precision CNC milling
- ◆4-flute geometry supports stable cutting engagement and smooth profile finishing
- ◆Standard R1–R6 sizes with custom radius, shank, length and coating options available
Product Configurations
Consistent Quality
Consistent geometry across repeat orders.
คำสั่งซื้อที่ยืดหยุ่น
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
แบบมาตรฐานและแบบตามสั่ง
Standard sizes and custom configurations.
Carbide Internal-Radius End Mill Overview
This 4-flute stub-length solid carbide internal-radius end mill is designed for precision radius machining, mold details and smooth curved transitions in steel components. The formed radius profile allows defined internal-radius features to be machined with consistent geometry, while the compact tool length provides a rigid setup for CNC milling. Four cutting edges support stable engagement during profile machining and finishing, and the micro-grain solid carbide substrate provides the strength and dimensional stability required for steel-oriented applications. Standard 4-flute configurations cover radius sizes from R1 to R6 mm.
R1–R6 mm
4 Flutes
Micro-Grain Carbide
50 / 60 / 75 mm
Internal-Radius Cutting Configuration
Form-Ground Radius Profile
The cutting profile is ground to the specified radius for machining defined internal-radius features, mold details and smooth transitions between adjacent surfaces.
Stub-Length Rigid Design
Compact 50–75 mm standard overall lengths help maintain tool rigidity and reduce unnecessary overhang during precision radius machining.
4-Flute Cutting Geometry
Four cutting edges provide repeated cutting engagement for stable profile machining and consistent surface finishing in steel applications.
Application-Specific Advantages
Defined Radius Geometry
Standard R1–R6 configurations cover common internal-radius and transition requirements.
Four Cutting Edges
The 4-flute layout supports stable cutting engagement during radius profiling and finishing.
Compact Tool Length
Stub-length configurations provide a compact cutting setup where extended reach is not required.
Custom Radius Options
Radius, shank diameter, overall length, coating and profile geometry can be reviewed for non-standard orders.
Recommended Machining Operations
RECOMMENDED
RECOMMENDED
RECOMMENDED
SUITABLE
Application Note:
Match the cutter radius to the required component radius and confirm adequate tool clearance around adjacent walls and features. Use a low-runout holder and the shortest practical overhang for precision radius finishing.
Workpiece Material Compatibility
| MATERIAL GROUP | APPLICATION | LEVEL |
|---|---|---|
| P Carbon Steel | Radius profiling, mold details and curved transitions | Primary |
| P Alloy / Mold Steel | Coating selected according to steel grade and hardness | Primary |
| M Stainless Steel | Application-specific coating and machining parameters recommended | Application Review |
| K Cast Iron | Suitable configuration selected according to workpiece condition | Suitable |
Product Details
Product views showing the internal-radius cutting profile, 4-flute geometry and compact solid carbide tool construction.
Tool Nomenclature & Dimensions
Reference dimensions for the 4-flute stub-length solid carbide internal-radius end mill. Select the radius according to the required component profile, then confirm shank diameter and overall length according to machining access and holder requirements. All listed dimensions are in millimeters.
Technical Configuration
| PARAMETER | REFERENCE CONFIGURATION |
|---|---|
| Tool Type | Internal-Radius End Mill / Inner-R Form Cutter |
| Tool Material | Micro-Grain Tungsten Carbide |
| Flute Count | 4 Flutes |
| Standard Radius Range | R1 / R1.5 / R2 / R2.5 / R3 / R4 / R5 / R6 mm |
| Shank Diameter Range | Ø4–Ø14 mm for listed 4-flute standard sizes |
| Overall Length | 50 / 60 / 75 mm standard 4-flute configurations |
| Coating Options | AlTiN / TiAlN / TiSiN / AlTiSiN / TiN / application-specific options |
| Reference Tolerance | 0 ~ ±0.01 mm reference; final tolerance confirmed according to feature and specification |
| Primary Materials | Carbon Steel / Alloy Steel / Mold Steel / Tool Steel |
| Machine Compatibility | CNC Machining Centers / Milling Machines |
| Customization | Radius, shank diameter, overall length, cutting profile, coating and marking can be reviewed according to drawings and application requirements. |
Standard 4-Flute Size Matrix
Reference 4-flute configurations for the stub-length internal-radius end mill series.
| SPECIFICATION | ARC RADIUS R | SHANK DIA. d | OVERALL LENGTH L | FLUTES |
|---|---|---|---|---|
| R1 × 4 × 50 × 4T | 1 | 4 | 50 | 4 |
| R1.5 × 6 × 50 × 4T | 1.5 | 6 | 50 | 4 |
| R2 × 6 × 50 × 4T | 2 | 6 | 50 | 4 |
| R2.5 × 8 × 50 × 4T | 2.5 | 8 | 50 | 4 |
| R3 × 8 × 50 × 4T | 3 | 8 | 50 | 4 |
| R4 × 10 × 60 × 4T | 4 | 10 | 60 | 4 |
| R5 × 12 × 75 × 4T | 5 | 12 | 75 | 4 |
| R6 × 14 × 75 × 4T | 6 | 14 | 75 | 4 |
Internal-Radius Milling Application Guidance
- Radius Selection: Match the cutter radius directly to the required component radius or existing tool specification.
- Profile Clearance: Check adjacent walls, shoulders and surrounding geometry to ensure the formed cutter can reach the radius without interference.
- Toolholding: Use a clean, low-runout precision holder for consistent radius geometry and surface quality.
- Tool Overhang: Use the shortest practical overhang to take advantage of the stub-length tool configuration.
- Coating Selection: Select the coating according to steel grade, hardness and machining conditions.
4-Flute Internal-Radius End Mill Customization
Arc radius, cutting profile, shank diameter, overall length, cutting-edge preparation and coating can be configured for internal-radius machining, mold details, curved transitions and profile finishing in steel components. Standard 4-flute stub-length configurations cover R1–R6 mm radius sizes with Ø4–Ø14 mm shank diameters and 50–75 mm overall lengths. Non-standard radius profiles and dimensions can be reviewed according to the component drawing, adjacent-wall clearance, workpiece material, machining depth, holder configuration and required profile accuracy.
| PARAMETER | MANUFACTURING CAPABILITIES |
|---|---|
| Arc Radius | Standard 4-flute radius configurations include R1, R1.5, R2, R2.5, R3, R4, R5 and R6 mm. Non-standard radii can be reviewed according to the finished component profile or existing cutter sample. |
| Internal-R Profile | The formed cutting profile can be matched to the required internal radius, curved transition or mold feature. Critical profile geometry should be confirmed from the component drawing for non-standard applications. |
| 4-Flute Configuration | The standard configuration uses four cutting edges for repeated engagement during radius profiling and finishing. Final edge geometry can be reviewed according to workpiece material, cutting engagement and surface-finish requirements. |
| Stub-Length Design | Standard overall lengths of 50, 60 and 75 mm provide a compact tool configuration where additional reach is not required. Shorter tool projection helps maintain a rigid machining setup. |
| Shank Diameter | Standard 4-flute configurations use Ø4, Ø6, Ø8, Ø10, Ø12 and Ø14 mm shank diameters according to radius size. Non-standard shank dimensions can be reviewed for holder compatibility. |
| Overall Length | Reference overall lengths are 50, 60 and 75 mm for the standard 4-flute series. Drawing-defined lengths can be reviewed where different holder clearance or machining access is required. |
| Profile Clearance | Tool body and profile dimensions can be reviewed according to adjacent walls, shoulders and surrounding features to provide adequate access to the required internal radius. |
| Cutting-Edge Preparation | Rake geometry, relief, edge preparation and flute finishing can be reviewed according to the steel grade, hardness, cutting load and required radius-surface quality. |
| Coating Selection | AlTiN, TiAlN, TiSiN, AlTiSiN, TiN and other application-specific coatings can be reviewed according to steel grade, hardness, cutting conditions and required tool life. |
| Workpiece Material | The product is positioned mainly for carbon steel, alloy steel, mold steel and tool-steel applications. Stainless-steel and other materials can be reviewed with the appropriate geometry and coating. |
| Machining Application | Geometry can be reviewed for internal-radius machining, curved-surface transitions, mold-detail profiling and profile finishing on CNC machining centers and milling machines. |
| Dimensional Requirements | Drawing-defined requirements can be reviewed for arc radius, profile geometry, shank diameter, overall length, feature clearance, profile accuracy and tool runout. |
| Replacement Tool Matching | Existing cutter dimensions and profile geometry can be reviewed from a tool drawing or physical sample for replacement and equivalent-tool requirements. |
| OEM & Private Label | Laser marking, custom tool codes, private labels and packaging can be reviewed for distributors and OEM customers according to specification and order quantity. |
บริการ OEM และแบรนด์ส่วนตัว
OEM manufacturing and private-label supply options are available for industrial distributors, tooling brands and repeat-production customers. Laser identification, label content, protective packaging and coating presentation can be configured according to the approved product specification and order requirements.
Laser Etching
Custom logos, tool codes, cutting dimensions, coating identification and batch numbers can be marked according to the available shank area.
Custom Labels & Packaging
Individual protective tubes, product labels, specification details, colored packaging tubes and private-label packaging can be reviewed.
Commercial Terms
MOQ, sample evaluation, custom-size trials, repeat orders and scheduled supply programs are confirmed according to the selected configuration.
Technical Workflow
A structured review process is used to confirm standard, customized and private-label square end mill requirements before production.
Inquiry
Submit the material, hardness, milling operation, dimensions, tolerance and quantity.
Engineering
Review flute geometry, helix angle, edge preparation, coating, ap and ae.
Commercial
Confirm quotation, MOQ, sample requirements, production schedule and delivery terms.
Production
CNC grinding, end-face formation, edge preparation, coating and laser marking.
Quality Control
Inspect diameter, flute length, shank, runout, square-end geometry and cutting edges.
Quality, Inspection & Delivery
Our solid carbide square end mills are controlled through material verification, precision grinding, in-process measurement and final inspection. Key dimensions, square-end geometry, cutting-edge condition, coating appearance and product identification are reviewed according to the approved specification or drawing before packing.
Three-Stage Quality Control
Inspection checkpoints are arranged around the manufacturing process to support dimensional consistency and repeat-order control.
Incoming Material Control
Carbide substrate grade, blank dimensions and supplied material information are checked against the production requirement.
In-Process Grinding Control
Cutting diameter, flute geometry, flute length, square-end profile and shank dimensions are monitored during CNC grinding.
Final Tool Inspection
Finished tools are reviewed for specified dimensions, runout, cutting-edge condition, coating appearance, marking and packing identification.
Key Inspection Characteristics
Inspection requirements are confirmed according to the standard product specification or the approved custom drawing.
| INSPECTION ITEM | CONTROL FOCUS | CONFIRMATION BASIS |
|---|---|---|
| Cutting Diameter (DC) | Diameter and dimensional consistency | Standard specification or approved drawing |
| Flute Length (APMX) | Effective cutting length | Confirmed product size or drawing requirement |
| Shank Diameter (DCON) | Clamping-section dimension and surface condition | Applicable shank specification |
| Overall Length (OAL) | Total tool length | Standard size matrix or approved drawing |
| Radial Runout | Concentricity between cutting section and shank | Agreed inspection requirement |
| Square-End Geometry | End-face profile, corner condition and center-cutting form | Selected tool configuration |
| Flute & Helix Profile | Flute count, helix form and grinding consistency | Approved manufacturing configuration |
| Cutting Edge & Coating | Edge condition, visible defects and coating appearance | Application-specific production requirement |
| Marking & Identification | Tool code, dimensions and batch information where applicable | Confirmed order and packaging specification |
Measurement & Batch Traceability
Optical measuring systems, tool inspection equipment and appropriate dimensional gauges are selected according to the feature being checked.
Optical Measurement
Profile and dimensional review of specified cutting features.
Runout Verification
Concentricity review based on the agreed product requirement.
Edge Inspection
Magnified review of the end face, corners and cutting-edge condition.
Batch Identification
Order, product and batch information are linked where required for repeat supply.
Protective Packaging Process
Finished end mills are protected to reduce contact between cutting edges and to support clear product identification during storage and transportation.
Bulk-Order & Export Packaging
Bulk shipments can be arranged with reinforced cartons, protective wrapping, palletized loading or export cases according to order quantity, shipment weight and agreed transportation requirements.
Delivery Coordination
Production completion, packing method and dispatch arrangements are confirmed according to the approved order. Courier, air, sea or customer-designated shipping options can be reviewed according to shipment size and destination. Final lead time is confirmed after product specifications, quantity and packaging requirements are approved.
Product & Application FAQs
Common questions about selecting and applying the 4-Flute Stub-Length Solid Carbide Internal-Radius End Mill for steel radius machining, mold details and curved-profile finishing.
What is this internal-radius end mill designed for?
How should I select the correct radius?
What is the benefit of the stub-length design?
What is the advantage of the 4-flute configuration?
Which steel materials can this cutter machine?
Which coatings are available?
Ordering & Customization FAQs
Ordering information for distributors, tooling suppliers and OEM customers requiring standard or customized internal-radius end mills.
What standard 4-flute sizes are available?
Are 2-flute internal-radius cutters also available?
Can a non-standard radius be customized?
Are OEM marking and private-label packaging available?
ระยะเวลาการผลิตโดยทั่วไปคือเท่าไร?
What information should I provide for quotation?
Technical Downloads
Reference documents for solid carbide cutter selection and starting machining-data review.
Solid Carbide End Mill Catalog
Review internal-radius cutters and related solid carbide milling tool series.
End Mill Speeds & Feeds Guide
Access reference starting parameters for machining trials and application review.
Need Sizes, Pricing or Custom Options?
Send us the required tool type, sizes, quantities, workpiece material and any OEM or custom requirements. We will confirm suitable specifications, availability, lead time and quotation details.
Drawings, size lists and reference photos are welcome.
