HRC45 4-Flute Inch-Size 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 4-Flute Inch-Size Solid Carbide Square End Mill
This HRC45-series 4-flute solid carbide square end mill is designed for precision milling of carbon steel, alloy steel, tool steel and selected pre-hardened steel using fractional-inch tooling systems. Its rigid four-flute core and precision-ground square-end geometry support stable side milling, profiling, shoulder milling, pocketing, light slotting and finishing. Standard inch sizes from 1/16″ to 3/4″ are available with standard, long-flute and extended-reach configurations.
Inch-Size 4-Flute Series
Fractional-inch cutting diameters and matching inch shanks support compatibility with imperial tooling systems. Standard and extended configurations can be selected according to the required reach and machining feature.
Key Features
Fractional-Inch Sizes
Standard inch dimensions support imperial toolholders and component drawings.
Rigid 4-Flute Core
Four cutting edges support stable tooth engagement and productive steel finishing.
Square-End Accuracy
Flat-bottom geometry supports pockets, bottom surfaces and defined 90° shoulders.
Flexible Configuration
Standard, long-flute and extended-reach models are available for different features.
Product Gallery
Recommended Applications
Side Milling
Stable wall machining with controlled radial engagement and low runout.
Shoulder Milling
Square-end geometry supports flat surfaces and accurate 90° shoulders.
Pocket & Light Slotting
Selected pocketing and slotting with suitable chip evacuation and engagement.
Profile Finishing
Consistent contour finishing in carbon, alloy, tool and mold steels.
Machining Application & Product Video
HRC45 4-Flute Inch-Size End Mill Specifications
Reference specifications and fractional-inch dimensions for the HRC45 4-flute solid carbide square end mill series. Final size availability, coating, tolerance and center-cutting capability should be confirmed by selected model or approved drawing.
| PARAMETER | REFERENCE CONFIGURATION |
|---|---|
| Substrate | Fine-grain solid carbide |
| Tool Type | Square / flat-end mill |
| Flute Count | 4 flutes |
| Size System | Fractional inch |
| Cutting Diameter | 1/16″–3/4″ reference range |
| Length Options | Standard, long-flute and extended-reach configurations |
| Coating Options | TiAlN, AlTiN or application-specific coating; uncoated option by confirmation |
| Workpiece Materials | Carbon steel, alloy steel, tool steel and selected pre-hardened steel |
| Series Application | Up to HRC45 under selected machining conditions |
| Custom Options | Drawing-based diameter, flute length, shank, overall length, geometry, coating and tolerance |
Inch-Size Nomenclature
Standard Size Range
| MODEL | D | LOC | SHANK d | OAL |
|---|---|---|---|---|
| 1/16 × 1/4 × 1/8 × 1-1/2 × 4F | 1/16 | 1/4 | 1/8 | 1-1/2 |
| 1/8 × 3/8 × 1/8 × 1-1/2 × 4F | 1/8 | 3/8 | 1/8 | 1-1/2 |
| 1/8 × 1/2 × 1/8 × 1-1/2 × 4F | 1/8 | 1/2 | 1/8 | 1-1/2 |
| 5/32 × 1/2 × 5/32 × 2 × 4F | 5/32 | 1/2 | 5/32 | 2 |
| 3/16 × 5/8 × 3/16 × 2 × 4F | 3/16 | 5/8 | 3/16 | 2 |
| 1/4 × 3/4 × 1/4 × 2-1/2 × 4F | 1/4 | 3/4 | 1/4 | 2-1/2 |
| 5/16 × 13/16 × 5/16 × 2-1/2 × 4F | 5/16 | 13/16 | 5/16 | 2-1/2 |
| 3/8 × 1 × 3/8 × 2-1/2 × 4F | 3/8 | 1 | 3/8 | 2-1/2 |
| 7/16 × 2 × 7/16 × 4 × 4F | 7/16 | 2 | 7/16 | 4 |
| 1/2 × 1 × 1/2 × 3 × 4F | 1/2 | 1 | 1/2 | 3 |
| 1/2 × 1-1/4 × 1/2 × 3 × 4F | 1/2 | 1-1/4 | 1/2 | 3 |
| 1/2 × 2 × 1/2 × 4 × 4F | 1/2 | 2 | 1/2 | 4 |
| 5/8 × 2 × 5/8 × 4 × 4F | 5/8 | 2 | 5/8 | 4 |
| 3/4 × 2 × 3/4 × 4 × 4F | 3/4 | 2 | 3/4 | 4 |
Selection & Setup Guidance
Exact Shank Matching
Use an inch collet or holder that matches the confirmed shank diameter.
Minimum Overhang
Use the shortest practical projection to improve rigidity and reduce deflection.
Controlled Engagement
Reduce cutting engagement when using long-flute or extended-reach models.
Coating Selection
Match coating and cutting parameters to steel grade, hardness and coolant method.
HRC45 4-Flute Inch-Size End Mill Customization
Fractional-inch cutting diameter, length of cut, overall length, shank dimensions, four-flute geometry, square-end profile, cutting-edge preparation and coating can be configured according to the steel grade, workpiece hardness, machining operation, imperial tooling system and production requirements.
Inch Dimensions & Reach
Fractional cutting diameter, length of cut, shank diameter and overall length can be configured according to the component drawing and required machining reach.
4-Flute Geometry
Flute form, helix angle, rake geometry, core thickness and chip space can be reviewed to balance tool rigidity, chip control and productivity in steel machining.
End & Edge Profile
Square-end geometry, center-cutting capability, gash design, corner condition and cutting-edge preparation can be matched to side milling, profiling, shoulder milling, pocketing or finishing.
Coating Selection
TiAlN, AlTiN and other application-specific coatings can be selected according to the steel grade, hardness, cutting temperature, coolant method and required tool life.
| PARAMETER | MANUFACTURING CAPABILITIES |
|---|---|
| Cutting Diameter | Standard fractional-inch sizes from 1/16″ to 3/4″, with selected intermediate and non-standard diameters reviewed according to the confirmed drawing |
| Flute Count | Standard 4-flute configuration for stable side milling, profiling, shoulder milling, pocketing and finishing of steel |
| Length of Cut & OAL | Standard, long-flute and extended-reach configurations with drawing-defined length of cut and overall length |
| Shank Configuration | Fractional-inch cylindrical shank matched to compatible inch collets and toolholders, with selected custom shank dimensions available |
| Flute & Helix Geometry | Four-flute geometry with application-specific helix, rake, core thickness and flute-space configuration for HRC45-series steel machining |
| Square-End Profile | Flat-bottom square-end geometry for pockets and 90° shoulders, with center-cutting capability confirmed by the selected configuration |
| Edge Preparation | Cutting-edge preparation, end-face grinding, gash geometry and corner condition matched to the workpiece hardness and cutting load |
| Coating Selection | TiAlN, AlTiN or another application-specific coating selected according to the steel grade, hardness, cutting temperature and coolant conditions |
| Milling Application | Geometry can be reviewed for side milling, profiling, shoulder milling, pocketing, semi-finishing and finishing operations |
| Dimensional Tolerance | Standard production tolerances or drawing-defined requirements for cutting diameter, length of cut, 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.
HRC45 4-Flute Inch-Size End Mill FAQs
Answers to common questions about selecting, applying and ordering the HRC45 4-flute inch-size solid carbide square end mill for steel machining.
What materials is this HRC45 end mill designed to machine? ＋
It is primarily designed for carbon steel, alloy steel, tool steel and selected pre-hardened steel within the confirmed HRC45 application range. Coating and cutting parameters should be selected according to the workpiece grade, hardness, machining operation and machine rigidity.
Does HRC45 mean that the tool can machine every steel grade at exactly 45 HRC? ＋
HRC45 indicates the product-series positioning and its upper target range under selected conditions. Actual suitability depends on the steel grade, tool diameter, cutting engagement, coating, holder condition, machine rigidity, coolant strategy and required tool life.
What operations are suitable for the 4-flute square-end design? ＋
The four-flute square-end geometry is suitable for side milling, profiling, shoulder milling, pocketing, semi-finishing and finishing. The flat-end profile supports bottom surfaces and 90° shoulders, while the four cutting edges provide stable tooth engagement and productive feed capability.
Can this 4-flute end mill be used for full-width slotting? ＋
Selected slotting operations are possible when cutting engagement and chip evacuation are properly controlled. However, four-flute tools provide less flute space than two-flute designs, so heavy full-width slotting may require reduced cutting parameters, reliable chip removal or a different flute configuration.
Are the listed dimensions supplied in inches? ＋
Yes. This product series is configured around inch-size cutting diameters and related inch-based dimensions. The cutting diameter, flute length, shank diameter and overall length should be confirmed using the selected item code or approved tool drawing before ordering.
Can inch-size end mills be used in metric toolholders? ＋
Only when the toolholder or collet is designed for the confirmed shank diameter. An inch-size shank should not be forced into an incorrectly sized metric holder. Correct clamping size, low runout and sufficient gripping length are important for tool life and machining accuracy.
Which coating should be selected for steel machining? ＋
AlTiN, TiSiN or another application-specific coating may be selected according to the steel grade, hardness, cutting temperature, coolant method and required tool life. Coating selection should be matched with the carbide substrate, cutting geometry and edge preparation rather than selected by color alone.
Ordering & Customization FAQs
Information for distributors, tooling brands and customers requesting standard or drawing-based inch-size configurations.
What inch sizes are available? ＋
Available sizes should be confirmed by fractional cutting diameter, flute length, shank diameter, overall length, helix geometry and coating. Standard stock and production availability may vary by selected configuration and order quantity.
Can non-standard inch dimensions be manufactured? ＋
Yes. Selected cutting diameters, flute lengths, shank dimensions, overall lengths, helix geometry, edge preparation and coatings can be reviewed according to the tool drawing and machining application. Final dimensions and tolerances are confirmed before production.
Are OEM marking and private-label packaging available? ＋
Laser marking, tool codes, inch-size identification, custom labels, protective tubes and private-label packaging can be reviewed according to the available marking area, order quantity and confirmed packaging specification.
What information is required for an accurate quotation? ＋
Please provide the workpiece material and hardness, cutting diameter, flute length, shank diameter, overall length, machining operation, axial and radial engagement, coating preference, tolerance requirements and order quantity. A tool drawing is recommended for non-standard inch-size projects.
Technical Downloads
Series dimensions, coating options and recommended starting parameters can be supplied according to the selected inch-size configuration.
Inch-Size Series Catalog
Request the available fractional diameters, flute lengths, shank dimensions, overall lengths and coating configurations.
Access Technical CatalogSpeeds & Feeds Guide
Request recommended starting parameters based on the selected inch size, steel grade, hardness, operation and machine conditions.
Request Cutting DataNeed 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.
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