HRC45-HRC55 4-Flute Solid Carbide Square End Mill for Steel
Consistent Quality
Consistent geometry across repeat orders.
Flexible Orders
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
Standard & Custom
Standard sizes and custom configurations.
HRC45–HRC55 Carbide Square End Mill Overview
This HRC45–HRC55-series 4-flute solid carbide square end mill is configured for stable side milling, shoulder milling, profiling, pocket finishing and selected light slotting in carbon steel, alloy steel, tool steel and pre-hardened steel. Its rigid four-flute core supports stable tooth engagement and productive finishing, while the square-end geometry produces flat-bottom features and defined 90° shoulders. Coating and edge preparation can be selected according to the steel grade, hardness and machining conditions.
Key Configuration
Square-End Cutting Profile
Designed for flat-bottom pockets, defined slot features and accurate 90° shoulders.
Rigid Four-Flute Core
Four cutting edges support stable engagement, tool rigidity and productive finishing in steel.
Steel-Matched Configuration
Carbide grade, edge preparation and coating can be selected for the confirmed steel hardness and cutting conditions.
Key Product Advantages
Stable Tooth Engagement
Four flutes support consistent engagement during side milling and finishing.
Defined Square Features
The square-end profile supports flat bottoms and controlled 90° shoulders.
Precision-Ground Geometry
Controlled cutting edges support dimensional consistency and surface quality.
Flexible Steel Range
Series options cover general and selected pre-hardened steel conditions.
Milling Operations
The four-flute square-end geometry is primarily configured for stable side cutting, shoulder machining and finishing. Final cutting conditions should be matched to tool diameter, flute length, workpiece hardness, engagement and machine rigidity.
Workpiece Material Compatibility
| MATERIAL GROUP | EXAMPLES | APPLICATION LEVEL |
|---|---|---|
| P Carbon Steel | General carbon and structural steels | Primary application |
| P Alloy & Tool Steel | Alloy, tool and mold steels | Confirm grade and hardness |
| H Pre-Hardened Steel | Selected pre-hardened steel conditions | Application review required |
Product Details & Milling Demonstration
Product views and a reserved machining-video position for the HRC45–HRC55 4-flute solid carbide square end mill.
HRC45–HRC55 4-Flute Square End Mill Specifications
Reference configuration and standard metric dimensions for the HRC45–HRC55 4-flute solid carbide square end mill. Confirm the selected carbide grade, coating, dimensions, tolerance and stock availability before ordering.
| PARAMETER | REFERENCE CONFIGURATION |
|---|---|
| Substrate | Fine- or micro-grain solid carbide selected by the confirmed series |
| Tool Type | Square / flat-end mill |
| Flute Count | 4 flutes |
| Cutting Diameter | Ø1–Ø20 mm listed standard range |
| Series Positioning | HRC45 and HRC55 steel-milling configurations selected according to material hardness and operation |
| Coating Options | AlTiN, TiAlN, TiSiN or application-specific coating confirmed by series and workpiece |
| Machine Compatibility | CNC machining centers and suitable milling machines |
| Custom Options | Selected diameters, flute lengths, shank diameters, overall lengths, tolerances, edge preparation and coating |
Size Nomenclature
Standard Metric Sizes
| SPECIFICATION | D | L1 | d | L |
|---|---|---|---|---|
| Φ1 × 3 × Φ4 × 50L | 1 mm | 3 mm | 4 mm | 50 mm |
| Φ2 × 6 × Φ4 × 50L | 2 mm | 6 mm | 4 mm | 50 mm |
| Φ3 × 9 × Φ4 × 50L | 3 mm | 9 mm | 4 mm | 50 mm |
| Φ3 × 9 × Φ3 × 50L | 3 mm | 9 mm | 3 mm | 50 mm |
| Φ4 × 12 × Φ4 × 50L | 4 mm | 12 mm | 4 mm | 50 mm |
| Φ5 × 13 × Φ5 × 50L | 5 mm | 13 mm | 5 mm | 50 mm |
| Φ5 × 13 × Φ6 × 50L | 5 mm | 13 mm | 6 mm | 50 mm |
| Φ6 × 15 × Φ6 × 50L | 6 mm | 15 mm | 6 mm | 50 mm |
| Φ8 × 20 × Φ8 × 60L | 8 mm | 20 mm | 8 mm | 60 mm |
| Φ8 × 24 × Φ8 × 60L | 8 mm | 24 mm | 8 mm | 60 mm |
| Φ9 × 25 × Φ10 × 75L | 9 mm | 25 mm | 10 mm | 75 mm |
| Φ10 × 25 × Φ10 × 75L | 10 mm | 25 mm | 10 mm | 75 mm |
| Φ10 × 30 × Φ10 × 75L | 10 mm | 30 mm | 10 mm | 75 mm |
| Φ12 × 30 × Φ12 × 75L | 12 mm | 30 mm | 12 mm | 75 mm |
| Φ14 × 45 × Φ14 × 100L | 14 mm | 45 mm | 14 mm | 100 mm |
| Φ20 × 45 × Φ20 × 100L | 20 mm | 45 mm | 20 mm | 100 mm |
Machining Guidance
Toolholding
Use a rigid holder, minimize overhang and verify spindle and holder runout before finishing.
Chip Control
Use suitable air blast or coolant and prevent chip recutting in pockets and slots.
Cutting Data
Select spindle speed, feed per tooth, axial depth and radial engagement by diameter, steel grade, hardness, coating and machine rigidity.
HRC45–HRC55 4-Flute Square End Mill Customization
Cutting diameter, flute length, shank diameter, overall length, four-flute geometry, square-end profile, cutting-edge preparation and coating can be reviewed according to the steel grade, workpiece hardness, machining operation and production requirements.
Dimensions & Reach
Cutting diameter, flute length, shank diameter and overall length can be configured according to the required feature size, machining depth and tool rigidity.
4-Flute Geometry
Core diameter, flute form, helix geometry and chip space can be reviewed to balance tool rigidity, stable engagement and surface quality during steel milling.
End & Edge Profile
Square-end geometry, center-cutting capability, corner preparation, gash geometry and cutting-edge condition can be selected according to the milling operation.
Carbide & Coating
Carbide grade, edge preparation and coating can be matched to the HRC45 or HRC55 series according to steel hardness, cutting temperature and machining conditions.
| PARAMETER | MANUFACTURING CAPABILITIES |
|---|---|
| Series Selection | HRC45 or HRC55 configuration selected according to the workpiece grade, hardness, milling operation and required tool life |
| Cutting Diameter | Standard Ø1–Ø20 mm range, with selected intermediate and non-standard diameters reviewed according to the confirmed tool drawing |
| Flute Count | Standard 4-flute configuration designed to support tool rigidity, stable tooth engagement and productive steel finishing |
| Flute Length | Standard, long-flute and drawing-defined configurations reviewed according to feature depth, cutting engagement and tool rigidity |
| Shank Configuration | Precision cylindrical shank with standard or drawing-defined shank diameter and clamping length |
| Overall Length | Standard, long-series and application-specific overall lengths reviewed according to machining reach and rigidity requirements |
| Flute & Helix Geometry | Four-flute core, helix angle, rake geometry and flute space reviewed according to chip formation, cutting stability and surface requirements |
| Square-End Profile | Flat-bottom square-end geometry for side milling, pockets and 90° shoulders, with center-cutting capability confirmed by the selected configuration |
| Edge Preparation | Application-matched cutting-edge preparation, end-face grinding, gash geometry and corner condition reviewed according to steel hardness and cutting load |
| Coating Selection | AlTiN, TiAlN, TiSiN or an application-specific coating selected according to the steel grade, hardness, cutting temperature and coolant conditions |
| Milling Application | Geometry can be reviewed for side milling, shoulder milling, profiling, pocket finishing, semi-finishing and selected light-slotting operations |
| Dimensional Tolerance | Standard production tolerances or drawing-defined requirements for cutting diameter, flute length, shank diameter, overall length, runout and square-end geometry |
OEM & Private Label Services
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
Answers to common questions about selecting and applying the HRC45–HRC55 4-Flute Solid Carbide Square End Mill for Steel.
What materials is this square end mill designed to machine?
Why use the 4-flute configuration for this application?
What milling operations are suitable for this square-end design?
Does HRC45–HRC55 cover every steel within that hardness range?
Which coating or surface treatment should be selected?
What machining conditions should be reviewed before use?
Ordering & Customization FAQs
Information for distributors, tooling brands and customers requesting standard or application-specific configurations.
What standard sizes are available?
Can non-standard dimensions or geometry be manufactured?
Are OEM marking and private-label packaging available?
What information is required for an accurate quotation?
Technical Downloads
Use the following references for product selection and starting cutting-data review.
Solid Carbide End Mill Catalog
Review related square-end, ball-nose, corner-radius and application-specific end mill series.
End Mill Speeds & Feeds Guide
Access reference starting parameters for application review and controlled machining trials.
Need a Size or Application Review?
Send the workpiece grade, hardness, required dimensions, machining operation and quantity for configuration and quotation 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.
