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The 4 Flutes 55HRC Steel 2 Inch End Mill Flat is designed for stable and efficient CNC milling of carbon steel, alloy steel, and pre-hardened steel materials. This high-performance 2 inch end mill features a rigid core structure and precision-ground cutting edges to ensure excellent vibration control and consistent surface finish in roughing and finishing operations.
Manufactured from premium micro-grain carbide, this 2 inch carbide end mill offers reliable wear resistance and thermal stability for long tool life under continuous machining conditions. The optimized 4-flute geometry improves chip evacuation while maintaining cutting strength, making the 2 inch diameter end mill suitable for high-speed and high-feed applications in industrial production.
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. |
A 2 inch end mill is commonly used for high-load CNC milling operations on large workpieces. Typical applications include side milling, profiling, slotting, and heavy material removal in steel, stainless steel, and cast iron. Due to its large diameter, it offers high rigidity and is well suited for industrial production where stability and productivity are critical.
A 2 inch carbide end mill provides superior hardness, heat resistance, and wear resistance compared to HSS tools. In steel machining and continuous production, carbide maintains a sharp cutting edge at elevated temperatures, allowing higher cutting speeds, longer tool life, and more consistent surface finish. This makes carbide the preferred choice for most CNC applications involving large-diameter end mills.
A 2 inch end mill is widely used for carbon steel, alloy steel, pre-hardened steel (up to around 55HRC), stainless steel, and cast iron. With the correct coating and geometry, it can also be applied to aluminum and other non-ferrous materials, although flute design and chip evacuation must be optimized for softer metals.
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 2 inch end mill is widely used in high-load CNC milling applications across automotive, mold making, general engineering, and heavy machinery industries. Designed for both roughing and finishing, this 2 inch carbide end mill delivers stable cutting performance when machining steel, stainless steel, and other ferrous materials under continuous production conditions.
With a rigid tool body and optimized flute design, the 2 inch diameter end mill supports efficient material removal while maintaining dimensional accuracy and surface consistency. Whether used for slotting, profiling, or side milling, this tool size is ideal for large workpieces and demanding machining environments where strength, reliability, and productivity are critical.
Built from premium micro-grain carbide, the 2 inch end mill offers excellent wear resistance and thermal stability for machining materials up to 55HRC. The advanced cutting edge preparation and balanced geometry help reduce vibration, improve chip evacuation, and extend tool life during high-speed and high-feed operations.
The precision-ground 4-flute structure enhances cutting stability and surface finish, making this 2 inch carbide end mill suitable for long production runs and tight tolerance requirements. Combined with strict quality control and consistent geometry, the 2 inch diameter end mill ensures repeatable performance across different machines and machining strategies.
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 2 inch end mill is commonly used for high-load CNC milling operations on large workpieces. Typical applications include side milling, profiling, slotting, and heavy material removal in steel, stainless steel, and cast iron. Due to its large diameter, it offers high rigidity and is well suited for industrial production where stability and productivity are critical.
A 2 inch carbide end mill provides superior hardness, heat resistance, and wear resistance compared to HSS tools. In steel machining and continuous production, carbide maintains a sharp cutting edge at elevated temperatures, allowing higher cutting speeds, longer tool life, and more consistent surface finish. This makes carbide the preferred choice for most CNC applications involving large-diameter end mills.
A 2 inch end mill is widely used for carbon steel, alloy steel, pre-hardened steel (up to around 55HRC), stainless steel, and cast iron. With the correct coating and geometry, it can also be applied to aluminum and other non-ferrous materials, although flute design and chip evacuation must be optimized for softer metals.
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.
When you’re running larger tools for serious material removal, a 2 inch end mill is often the go-to choice. It offers high rigidity, strong chip capacity, and the ability to keep cycle times under control on big workpieces. But “2 inch” can mean different things in real machining: tool diameter, tool family (flat vs ball), and even how it matches your spindle, holder, and machine torque. In this guide, we’ll break down how to select a 2 inch carbide end mill, when a 2 inch diameter end mill makes sense, and how ball end options (like a 2 inch ball end mill) compare—especially for steel machining.
A 2 inch end mill refers to a milling cutter with a 2-inch cutting diameter. Compared with smaller diameters, a 2-inch tool behaves differently in three important ways:
Higher stiffness and lower deflection
A larger diameter cutter resists bending better, which helps maintain wall accuracy and reduces chatter in side milling.
Higher torque demand
A 2 inch diameter end mill needs more spindle torque to cut efficiently—especially in steel. If your machine is torque-limited, you may need lower RPM and smarter engagement.
More impact from chip evacuation and heat
A bigger cut generates more heat and more chips. Tool geometry, coolant strategy, and chip load become more critical than on small tools.
In industrial CNC milling, the 2 inch carbide end mill is popular because carbide offers:
High hot hardness (edge stays sharp at higher temperatures)
Better wear resistance in abrasive steels
Higher stiffness, which supports aggressive feeds
That said, carbide is also more brittle than HSS. If you have unstable setups, excessive runout, or interrupted cuts with shock loading, you’ll want to control vibration first—otherwise any 2 inch end mill will fail early, and carbide will fail faster.
Most production milling uses flat end mills for slots, shoulders, and facing-like paths. But a 2 inch ball end mill has its own best use cases:
3D surfacing and contouring on molds and large curved features
Blending radii where a flat tool would leave steps
Finishing when surface consistency matters more than maximum MRR
However, ball tools don’t cut the same way at the center. The center cutting speed is close to zero at the tip, which means a 2 inch ball end mill can rub if feeds, stepover, or toolpath strategy are not optimized.
You may also see searches like 1/2 inch ball end mill and 1/2 inch ball nose end mill. That’s a different tool size category (0.5" diameter), typically used for smaller parts, tighter radii, and lighter cutting loads. If your work involves fine contours, tight pockets, or small fillets, a 1/2 inch ball nose end mill may be a better match than a large 2-inch ball tool. In other words: the “best” ball end mill isn’t only about tool type—it’s about diameter matching the geometry and rigidity of the job.
For steel machining, many shops start with a 4-flute design because it balances:
Edge strength (more flutes = stronger core)
Feed potential (more cutting edges per revolution)
Surface finish (more edges = smoother finish under stable conditions)
A 4-flute 2 inch end mill is often used for side milling, profiling, and finishing passes on steel. If your application is heavy roughing with deep radial engagement, you may still prefer fewer flutes (or a dedicated roughing geometry) to create more chip space.
Before choosing any 2 inch diameter end mill, make sure the machine and setup can support it:
A large cutter needs torque. If you have high RPM but low torque at lower speeds, you may struggle in steel. Consider the torque curve of your spindle and don’t assume “faster is better.”
Large tools magnify small setup errors. Shrink fit, hydraulic chuck, and robust side-lock holders can all work—what matters most is low runout and clamping stability.
Runout reduces tool life and makes cutting uneven. With a 2 inch end mill, runout can turn one flute into the “hero flute” that takes most of the load.
Big cutters punish weak fixtures. If the part can vibrate, the tool will chatter. That hurts surface finish and chips edges quickly.
Even the best 2 inch carbide end mill won’t perform if the toolpath is wrong for steel. These guidelines help:
Use moderate radial engagement (avoid full-width slotting unless the tool is designed for it)
Consider adaptive toolpaths to keep constant load
Keep chip thickness consistent by controlling stepover and feed
Use climb milling for better finish and edge life in most CNC setups
Avoid dwelling at the bottom of a pocket or corner, which creates heat and edge wear
If you are using a 2 inch ball end mill for finishing, focus on:
smaller stepovers for smoother surface
consistent tool contact
proper feed so the tool doesn’t rub near the center
When a 2 inch end mill fails, the break pattern often points to the real cause:
Chipping on the edge → vibration, intermittent cuts, or excessive runout
Rapid flank wear → too much heat, wrong coating for the material, insufficient coolant/air
Built-up edge (BUE) → feeds/speeds mismatch, poor chip evacuation, or wrong geometry for sticky materials
Chatter marks on the wall → tool overhang too long, weak holder, poor workholding, or too aggressive engagement
A 2 inch end mill is a productivity tool—when the machine and setup can support it. For steel, a 2 inch carbide end mill is often preferred for stiffness and wear resistance, while a 2 inch diameter end mill selection should always consider spindle torque, toolholder stability, and workholding rigidity. For 3D contours and blending, a 2 inch ball end mill can deliver excellent surface quality, while smaller radii features may be better suited to tools like a 1/2 inch ball end mill or 1/2 inch ball nose end mill.
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!
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