HRC55 4-Flute Inch-Size Solid Carbide Square End Mill for Alloy 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.
HRC55 Inch-Size Carbide Square End Mill Overview
This HRC55-series 4-flute solid carbide square end mill is designed for stable CNC milling of alloy steel, carbon steel, mold steel and confirmed pre-hardened steel. Its imperial cutting and shank dimensions integrate with inch-based drawings, collets, holders and CNC tool libraries. Four cutting edges and a rigid carbide core support productive side milling, shoulder milling, profiling and finishing, while the square-end geometry produces flat floors and defined 90° shoulders.
Product Configuration
Why Four Flutes for Alloy Steel?
More Cutting Edges
Four teeth engage during each revolution, supporting a higher programmed feed than a comparable 2-flute tool at the same feed per tooth.
Stable Side Milling
Regular cutting-edge engagement supports shoulder milling, profiling and finishing when radial engagement is properly controlled.
Rigid Core Geometry
The four-flute cross section supports rigidity and dimensional stability in accurate steel-milling setups.
Geometry & Tool Features
Precision-Ground Square End
Supports flat floors, straight shoulders, profiles and defined 90° features.
Solid Carbide Construction
Provides rigidity and dimensional stability when used with an accurate holder and minimal tool projection.
Imperial Tooling Compatibility
Fractional-inch cutting and shank dimensions support imperial part drawings, collets, toolholders and tool libraries.
Recommended Applications
Side Milling
Wall and shoulder machining with controlled radial engagement.
Profiling
External contours and dimensional finishing on alloy-steel components.
Pocket Milling
Flat floors and internal features with suitable entry paths and chip evacuation.
Finish Milling
Consistent finishing passes on rigid CNC machines with controlled runout.
Product Gallery
4 flute HRC55 square end mill detail view
HRC55 4-Flute Inch-Size End Mill Video
Technical Specifications
Reference configuration for the HRC55 4-flute inch-size solid carbide square end mill. Confirm the alloy-steel grade, hardness, coating and selected imperial dimensions before ordering.
| PARAMETER | REFERENCE CONFIGURATION |
|---|---|
| Tool Type | Inch-size solid carbide square / flat-end mill |
| Flute Count | 4 flutes |
| Size System | Fractional-inch cutting diameter, length of cut, shank diameter and overall length |
| Cutting Diameter | 1/16–3/4 inch in the supplied standard-size list |
| End Profile | Square / flat end for flat floors and 90° shoulders |
| Workpiece Range | Alloy steel, carbon steel, mold steel and confirmed pre-hardened steel within the HRC55 series range |
| Primary Operations | Side milling, profiling, shoulder milling, pocket milling and finishing |
| Coating | Application-matched coating; confirm according to steel grade, hardness and coolant strategy |
Inch-Size Nomenclature
Cutting diameter
Length of cut
Shank diameter
Overall length
Available Inch Sizes & Dimensions
All dimensions are in inches. Model format: D × LOC × d × OAL × 4F.
| MODEL | D | LOC | SHANK d | OAL | FLUTES |
|---|---|---|---|---|---|
| 1/16 × 1/4 × 1/8 × 1-1/2 × 4F | 1/16 | 1/4 | 1/8 | 1-1/2 | 4 |
| 1/8 × 3/8 × 1/8 × 1-1/2 × 4F | 1/8 | 3/8 | 1/8 | 1-1/2 | 4 |
| 1/8 × 1/2 × 1/8 × 1-1/2 × 4F | 1/8 | 1/2 | 1/8 | 1-1/2 | 4 |
| 5/32 × 1/2 × 5/32 × 2 × 4F | 5/32 | 1/2 | 5/32 | 2 | 4 |
| 3/16 × 5/8 × 3/16 × 2 × 4F | 3/16 | 5/8 | 3/16 | 2 | 4 |
| 1/4 × 3/4 × 1/4 × 2-1/2 × 4F | 1/4 | 3/4 | 1/4 | 2-1/2 | 4 |
| 5/16 × 13/16 × 5/16 × 2-1/2 × 4F | 5/16 | 13/16 | 5/16 | 2-1/2 | 4 |
| 3/8 × 1 × 3/8 × 2-1/2 × 4F | 3/8 | 1 | 3/8 | 2-1/2 | 4 |
| 7/16 × 2 × 7/16 × 4 × 4F | 7/16 | 2 | 7/16 | 4 | 4 |
| 1/2 × 1 × 1/2 × 3 × 4F | 1/2 | 1 | 1/2 | 3 | 4 |
| 1/2 × 1-1/4 × 1/2 × 3 × 4F | 1/2 | 1-1/4 | 1/2 | 3 | 4 |
| 1/2 × 2 × 1/2 × 4 × 4F | 1/2 | 2 | 1/2 | 4 | 4 |
| 5/8 × 2 × 5/8 × 4 × 4F | 5/8 | 2 | 5/8 | 4 | 4 |
| 3/4 × 2 × 3/4 × 4 × 4F | 3/4 | 2 | 3/4 | 4 | 4 |
Setup Guidance
Control Runout
Use a clean, accurate holder so cutting load is distributed across all four flutes.
Keep Overhang Short
Use the shortest practical projection to reduce deflection, chatter and uneven corner wear.
Program for Four Teeth
Calculate feed using four flutes, then adjust for engagement, hardness and machine rigidity.
Match Coating & Cooling
Confirm the coating and maintain a consistent dry, air-assisted, mist or coolant strategy.
HRC55 Inch-Size Square End Mill Customization
Fractional-inch cutting diameter, length of cut, shank diameter, overall length, four-flute geometry, square-end profile, cutting-edge preparation and coating can be reviewed for alloy-steel and general steel milling. Standard configurations support imperial drawings, inch collets, toolholders and established CNC tool libraries, while selected non-standard dimensions can be evaluated according to the workpiece grade, hardness, machining operation, tool engagement and required dimensional accuracy.
| PARAMETER | MANUFACTURING CAPABILITIES |
|---|---|
| Cutting Diameter | Standard fractional-inch cutting diameters from 1/16 to 3/4 inch based on the listed series, with selected intermediate and non-standard sizes reviewed according to the confirmed drawing |
| Flute Count | Standard 4-flute configuration for stable side milling, shoulder milling, profiling, pocket milling and selected finishing operations |
| Length of Cut & OAL | Standard inch-based length-of-cut and overall-length combinations, with selected drawing-defined reach configurations reviewed according to feature depth and tool rigidity |
| Shank Configuration | Precision cylindrical inch shank matched to compatible imperial collets and toolholders, with selected drawing-defined shank configurations available for review |
| Four-Flute Geometry | Application-matched four-flute geometry with controlled core strength, helix, rake and flute space for alloy-steel chip formation and cutting stability |
| Square-End Geometry | Precision-ground flat-bottom profile for pockets, profiles, flat floors and defined 90° shoulders, with center-cutting capability confirmed by the selected configuration |
| Edge Preparation | Cutting-edge preparation, end-face grinding, gash geometry and corner condition reviewed according to the alloy-steel grade, workpiece hardness and cutting load |
| Coating Selection | Wear-resistant coating selected according to the steel composition, workpiece hardness, cutting temperature, coolant strategy and required tool life |
| Workpiece & Application | Configured for alloy steel, carbon steel, mold steel and confirmed pre-hardened steel within the HRC55 series range, primarily for side milling, profiling, shoulder milling and finishing |
| 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.
Product & Application FAQs
Answers to common questions about selecting and applying the HRC55 4-Flute Inch-Size 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?
How should inch-size dimensions be specified?
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.
