HNCarbide 4 Flutes 55HRC Steel End Mill Flat is a solid carbide 4 flute end mill engineered for stable, high-precision CNC machining of alloy steel, carbon steel and pre-hardened steels up to 55HRC. The rigid 4 flute end mill cutter design improves tool stability, reduces vibration and delivers excellent surface finish in side milling, slotting and finishing operations. Optimized flute geometry and edge preparation provide reliable chip control and long tool life under aggressive 4 flute end mill feeds and speeds.
If you are comparing 2 vs 4 flute end mill options or wondering 2 flute or 4 flute end mill for steel, this series is the ideal choice when you need higher metal removal rates and better dimensional accuracy. For non-ferrous materials and aluminum, we also offer dedicated 2 flute or 4 flute end mill for aluminum to complete your tooling portfolio.
Grade HN40 is made from submicron WC powder, some speclal additlves added to optimize theproperties with good combination of hardness and toughness.
Its suitable for making drills and miling tools for machining stainless steel, tool steel and heat-resistingalloys.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN40 | 10 | 0.8 | 14.45 | 91.8 | 1,580 | 3,600 | 11.8 |
| Scientific name | Composition | Physical properties | Features | Typical applications |
|---|---|---|---|---|
| TiSiN | Ti (titanium): main element, forms TiN nanocrystalline phase. Si (silicon): usually 6–10%, forms amorphous Si₃N₄ phase, refines grains and increases hardness. N (nitrogen): combines with Ti and Si to form a composite structure. | Colour: TiSiN coatings usually appear bronze or dark grey-bronze; exact colour depends on Si content, deposition process (such as PVD) and thickness (1–4 μm). Hardness: 34–42 GPa (≈3400–4200 HV). Friction coefficient: 0.3–0.6 (against steel). Temperature resistance: 1000–1200°C (oxidation resistance). Coating thickness: 1–5 μm (typically 2–3 μm). Deposition temperature: 200–400°C (suitable for carbide tools). | Ultra-high hardness: amorphous Si₃N₄ phase suppresses dislocation movement, giving much higher hardness than TiN (~23 GPa) and TiAlN (~35 GPa). High-temperature stability: suitable for dry cutting and high-speed machining (e.g. quenched steels HRC 60+). Anti-adhesion: reduces built-up edge when machining aluminium alloys, stainless steels and other sticky materials. | Tool coatings: drills, mills (especially suitable for PCB routers, tool life increased by 2–3 times). High-speed cutting of quenched steels, titanium alloys and high-nickel alloys. Mould strengthening: die-casting moulds and stamping dies, improving wear resistance. Industrial parts: piston rings and other high-temperature wear parts. |
Aluminum / non-ferrous: choose 2 flutes end mill flat end for better chip evacuation.
Steel / alloy steel: choose 4 flutes end mill flat end for stable cutting and good surface finish.
Cast iron: use a dedicated end mill flat end for cast iron with reinforced edge.
Stainless steel: use end mill flat end for stainless steel with high wear resistance.
Higher hardness and unstable clamping require more rigid tools and conservative cutting data.
Optimized geometry to reduce cutting heat and vibration
High-hardness carbide and wear-resistant coating
Preferably 4 flutes end mill flat end for stable finishing and longer tool life
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
The HM Series 4 Flutes End Mill Flat is a versatile solid carbide 4 flute end mill for precise side milling, slotting and finishing in alloy steel, stainless steel and cast iron. Its rigid core and balanced geometry keep vibration low, helping you achieve consistent dimensional accuracy and clean surface finishes in everyday CNC production.
Each 4 flute end mill cutter is ground on advanced CNC machines and inspected under strict quality control to ensure reliable performance across batches. The flute design supports stable 4 flute end mill feeds and speeds, making it suitable for both conventional and high-speed machining.
The HM Series is available in common metric and inch sizes, such as a 1 4 4 flute end mill for general-purpose setups, giving you a flexible solution from small parts to heavy components while keeping tool management simple.
Grade HN55 is made from ultrafine close to nanometer sized WC powder, with very high wear resistancet’s suitable for making miling、 drilling tools and reamers, for high-speed miling of materials with highhardness.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN55 | 9 | 0.3 | 14.50 | 93.8 | 1,960 | 3,800 | 8.0 |
| Scientific name | Composition | Physical properties | Features | Typical applications |
|---|---|---|---|---|
| AlCrSiN | Aluminium–chromium–silicon nitride coating containing Si | Hardness: not clearly specified, but the presence of Si significantly increases hardness and toughness (estimated HV＞3500). | Si forms a denser nanostructure, improving wear resistance and high-temperature stability. | Specially designed for drills, end mills and ball-nose mills and other shank-type tools. Suitable for machining high-hardness materials (such as quenched workpieces) and materials after heat treatment. |
Aluminum / non-ferrous: choose 2 flutes end mill flat end for better chip evacuation.
Steel / alloy steel: choose 4 flutes end mill flat end for stable cutting and good surface finish.
Cast iron: use a dedicated end mill flat end for cast iron with reinforced edge.
Stainless steel: use end mill flat end for stainless steel with high wear resistance.
Higher hardness and unstable clamping require more rigid tools and conservative cutting data.
Optimized geometry to reduce cutting heat and vibration
High-hardness carbide and wear-resistant coating
Preferably 4 flutes end mill flat end for stable finishing and longer tool life
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
The GM Series 4 Flutes End Mill Flat is a high-performance solid carbide 4 flute end mill designed for stable, high-speed machining of alloy steel, stainless steel and pre-hardened steels. With a reinforced core and optimized rake and relief angles, this 4 flute end mill cutter runs smoothly in side milling, slotting and finishing, delivering tight tolerances and a clean surface finish even under heavy cutting loads.
Compared with typical 3 flute vs 4 flute end mill options, the GM Series focuses on rigidity and wear resistance, making it ideal when you need higher metal removal rates and longer tool life in steels. Application-oriented geometry and coating also simplify the selection of suitable 4 flute end mill feeds and speeds for different CNC machines. GM Series covers a wide size range, from small tools like 1 8 4 flute end mill to larger diameters for structural parts, giving you a consistent solution from roughing to finishing.
Grade HN40 is made from submicron WC powder, some speclal additlves added to optimize theproperties with good combination of hardness and toughness.
Its suitable for making drills and miling tools for machining stainless steel, tool steel and heat-resistingalloys.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN40 | 10 | 0.8 | 14.45 | 91.8 | 1,580 | 3,600 | 11.8 |
| Scientific name | Composition | Physical properties | Features | Typical applications |
|---|---|---|---|---|
| ALCRN | Al: 18–32% Cr: 10–25% N: 45–57% | Hardness: 2800–3200 HV (≈30–32 GPa) Thickness: 1–5 μm (typically 3–4 μm in applications) Oxidation temperature: 1000–1100°C (short-term up to 1100°C) Deposition temperature: ＜500°C (suitable for HSS and carbide substrates) | Red hardness: maintains hardness even at 1100°C, better than TiAlN (whose hardness drops above about 900°C). Adhesion: critical load up to 40 N (with optimized process). Wear resistance: suitable for high-speed cutting and dry machining, especially effective on stainless steels and alloy steels. | Cutting tools: end mills, gear cutters, drills (e.g. Balinit Alcorna series). Moulds: aluminium die-casting moulds, stamping tools. Industrial parts: piston rings, high-temperature wear-resistant parts (combined with suitable interlayer design). |
Aluminum / non-ferrous: choose 2 flutes end mill flat end for better chip evacuation.
Steel / alloy steel: choose 4 flutes end mill flat end for stable cutting and good surface finish.
Cast iron: use a dedicated end mill flat end for cast iron with reinforced edge.
Stainless steel: use end mill flat end for stainless steel with high wear resistance.
Higher hardness and unstable clamping require more rigid tools and conservative cutting data.
Optimized geometry to reduce cutting heat and vibration
High-hardness carbide and wear-resistant coating
Preferably 4 flutes end mill flat end for stable finishing and longer tool life
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
The 4 Flutes 60HRC Stainless Steel End Mill Flat is a solid carbide 4 flute end mill engineered for stable machining of stainless steel, alloy steel and other materials up to 60HRC. Its reinforced core and optimized chip pocket design help reduce vibration and maintain tight tolerances in side milling, slotting and finishing operations. Compared with a typical 2 vs 4 flute end mill choice, this 4 flute end mill cutter offers higher metal removal rates and smoother surface finishes when cutting tough, work-hardening stainless steels.
Each tool is ground on advanced CNC equipment and strictly inspected to ensure consistent performance and predictable tool life, even at demanding 4 flute end mill feeds and speeds. This series is ideal for precision components, molds and high-value parts where edge integrity and dimensional stability are critical, while other HNCarbide options such as our 4 flute end mill for aluminum complete your tooling selection for non-ferrous materials.
Grade HN44F is made from submicron WC powder, some special additives added.
It’s suitable for making drills and end mills, especially for machining steel,Al-based alloys and Ti-basedalloys.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN44F | 12 | 0.4 | 14.15 | 92.6 | 1,720 | 4,200 | 9.6 |
| Scientific name | Composition | Physical properties | Features | Typical applications |
|---|---|---|---|---|
| CrAlTiSiN | Cr: 12–16% Al: 20–24% Ti: 4–8% Si: 6–10% N: 48–52% | Ultra-high hardness: hardness can reach 38–40 GPa (e.g. CrAlSiN/TiAlSiN modulated coatings), much higher than traditional TiN or CrN. Si forms amorphous Si₃N₄, which suppresses dislocation movement and improves wear resistance. Excellent high-temperature performance: oxidation temperature up to 1000–1100°C, suitable for high-speed dry cutting. At high temperature, a dense Al₂O₃ and Cr₂O₃ oxide layer forms on the surface, slowing further oxidation. Low friction coefficient: about 0.375–0.675, depending on modulation period and Si content. Strong adhesion: with transition-layer design (such as AlCrTi alloy layer), critical load can exceed 18 N (scratch test). | High-speed cutting tools: such as mills and drills, suitable for hardened steels, titanium alloys and other difficult-to-machine materials. Mould surface reinforcement: improves wear resistance and thermal-fatigue resistance of stamping dies. Aerospace components: such as turbine-blade coatings, resisting high-temperature oxidation and particle erosion. |
Aluminum / non-ferrous: choose 2 flutes end mill flat end for better chip evacuation.
Steel / alloy steel: choose 4 flutes end mill flat end for stable cutting and good surface finish.
Cast iron: use a dedicated end mill flat end for cast iron with reinforced edge.
Stainless steel: use end mill flat end for stainless steel with high wear resistance.
Higher hardness and unstable clamping require more rigid tools and conservative cutting data.
Optimized geometry to reduce cutting heat and vibration
High-hardness carbide and wear-resistant coating
Preferably 4 flutes end mill flat end for stable finishing and longer tool life
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
The 4 Flutes 65HRC Blue Nano Coated End Mill Flat is a solid carbide 4 flute end mill designed for hard milling of heat-treated steel, tool steel and dies up to 65HRC. The ultra-fine carbide substrate and blue nano coating provide excellent wear resistance, thermal stability and edge integrity under continuous high-speed cutting.
Its balanced geometry and rigid core help this 4 flute end mill cutter run with low vibration in side milling, slotting and finishing, delivering clean surface finishes and dependable dimensional accuracy. Optimized flute space supports stable 4 flute end mill feeds and speeds, even in long, continuous toolpaths.
If you are comparing 2 vs 4 flute end mill choices for hardened steel, this series offers the stability and tool life required for precision molds, punches and other high-value components, helping reduce tool changes and improve overall process reliability in demanding CNC applications.
Grade HN44F is made from submicron WC powder, some special additives added.
It’s suitable for making drills and end mills, especially for machining steel,Al-based alloys and Ti-basedalloys.
| Grade | Cobalt content % | Grain size | Density g/cm³ | Hardness HRA | Hardness HV30 | MPa Transverse rupture strength | MPa ·m1/2 Fracture toughness MPa ·m1/2 |
|---|---|---|---|---|---|---|---|
| HN44F | 12 | 0.4 | 14.15 | 92.6 | 1,720 | 4,200 | 9.6 |
| Scientific name | Composition | Physical properties | Features | Typical applications |
|---|---|---|---|---|
| Nano-Blue | Blue surface layer: may contain AlCrN (aluminium-chromium nitride) or TiSiN (titanium–silicon nitride); the blue colour comes from nano-structured interference. Nanomultilayer structure: alternating layers such as TiN/AlN (individual layer thickness ＜50 nm) to increase hardness and thermal stability. | Hardness: 3000–4000 HV (nano-indentation). Friction coefficient: 0.1–0.3 (lower when combined with DLC). Heat resistance: stable up to 1000°C (oxidation starts above 800°C). Adhesion strength: ≥70 N (critical load in scratch test). Surface roughness: Ra ＜0.05 μm (after polishing). | Blue appearance: achieved by nano-optical thin-film design, and can serve as wear indicator (colour change shows coating loss). Self-lubricating: some Si- or WC-containing nanocoatings can form a silica-based lubricating layer at high temperature. | Recommended workpiece materials High-hardness steels (HRC＞50, such as mould steel, bearing steel). High-temperature alloys (nickel-based / titanium alloys, relying on coating heat resistance). Non-ferrous metals (aluminium and copper alloys, requiring low-friction coating to prevent built-up edge). Composites (CFRP, avoiding adverse reactions between coating and fibres). Typical application fields Aerospace: machining turbine-blade dovetails, milling titanium-alloy structural parts. Automotive moulds: high-precision cavity milling, balancing efficiency and surface quality. Medical devices: micro-machining of cobalt-chromium artificial joints. |
Aluminum / non-ferrous: choose 2 flutes end mill flat end for better chip evacuation.
Steel / alloy steel: choose 4 flutes end mill flat end for stable cutting and good surface finish.
Cast iron: use a dedicated end mill flat end for cast iron with reinforced edge.
Stainless steel: use end mill flat end for stainless steel with high wear resistance.
Higher hardness and unstable clamping require more rigid tools and conservative cutting data.
Optimized geometry to reduce cutting heat and vibration
High-hardness carbide and wear-resistant coating
Preferably 4 flutes end mill flat end for stable finishing and longer tool life
Yes. We can produce non-standard tools according to your drawings, samples or machining requirements (material, coating, size, tolerance and application). Our engineers will evaluate and provide a quotation and lead time.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
We Are Commited To Providing High-Quality, Customized solutions At An Affordable price While Also Prioritizing sustainability And ExcellentCustomer Service, These Qualities Make Us A Great choice For Your 4 flute end mill Needs
We Only Use unground tungsten carbide rods with HlP sintering and100% virgin material. Our grade includes lsO K05 to K40, frommachining carbon steel to aluminium, non-ferrous metals andtitanium or we develop grade for your applications.
As a HNCarbide customer, you can enjoy five-axis high-precisiongrinding machines from Australia’s ANCA or Germany’s Walter. Themodern workshop with constant temperature and humidity ensuresthe accuracy of each 4 flute end mill.
Each of your tungsten steel 4 flute end mill will be sandblasted toeffectively remove burrs and improve the finish.
All HNCarbide’s 4 flute end mill will be monitored on WALTER HELICHEEK andZOLLER GENlUS 3 to ensure that every dimension is qualified. We arecommitted to controlling the tolerance within 3 UM.
At HNCarbide, every shipment is meticulously packaged to ensure your tools arrive intact.
Each HNCarbide Solid 4 flute end mill is individually placed in a shock-resistant protective case, labeled with complete specifications, and sealed in moisture-proof packaging material before being boxed.
Large-volume orders are reinforced with double-wall cardboard boxes or wooden crates to maximize safety during international shipping.
We collaborate with reliable logistics partners to ensure goods are delivered quickly and securely to their destination via air freight, sea freight, or express courier.
A 4 flute end mill has four cutting edges, offering higher rigidity and better surface finish than a 2 flute tool. It is ideal for side milling, slotting and finishing in steel, stainless steel and cast iron, especially when you need higher metal removal rates and dimensional accuracy.
For aluminum, a 2 flute or 4 flute end mill for aluminum can both work, but 2 or 3 flutes usually provide more space for chip evacuation. A dedicated 4 flute end mill for aluminum or 4 flute end mill aluminium with polished flutes and sharp edges is recommended for high-speed finishing.
We supply a wide range of metric and inch sizes, including 1 8 4 flute end mill, 1 4 4 flute end mill, 3 8 4 flute end mill, 5/16 4 flute end mill and many others. Complete 4 flute end mill set options are also available on request.
For serious buyers and distributors, we can offer free standard samples if in stock. Usually you only need to cover the freight cost. For customized tools, a sample fee may apply, which can be refunded or deducted in bulk orders.
Yes.
Regional or customer protection based on sales targets, avoiding price wars among our partners.
Catalogs, brochures, product photos, technical data sheets, online materials.
For key partners, joint promotion, exhibitions and digital marketing support.
Safety stock for fast-moving items and forecast-based production.
Priority production and regular shipments to reduce stock-out risk.
Clear quality warranty policy, quick response to claims.
Replacement, credit or other solutions after confirmation of issues.
Tool selection and cutting parameter advice.
Problem analysis for different materials and machines.
Online training, documents, and when possible, on-site support for key accounts.
Before you go, please note that we offer the most up-to-date industry research reports and the most comprehensive product catalogs, so please contact us if you are interested!
Before you go, please note that we offer the most up-to-date industry research reports and the most comprehensive product catalogs, so please contact us if you are interested!
