Bullnose End Mill

HNCarbide offers a range of high-quality bullnose end mills for precise milling of steel, stainless steel, aluminum, and cast iron. Compared to flat end mills, bullnose end mill cutters provide a more durable cutting edge, reducing chipping and extending tool life, while ensuring cleaner surfaces in 3D profiles and contour machining.

We offer various bullnose end mill sizes, from small diameters like the 1/8 bullnose end mill for fine detailing, to larger sizes for efficient roughing. Choose from 2 flute bullnose end mills for softer materials, or 4 flute bullnose end mills for tougher alloys.

HNCarbide provides flexible options, whether you need a 1/2 bullnose end mill, a 3/8 bullnose end mill, or a 5 flute bullnose end mill for harder materials. We ensure consistent quality, quick delivery, and custom configurations to meet your milling needs.

Our Bullnose End Mill Product Range

HN55-C4 Read More HN60-VCS4 Read More GM-C4 Read More HN65-C4 Read More

Simplify Complex Contours!

Leveraging advanced CNC grinding technology and strict ISO-compliant quality control, we ensure stable cutting performance, long tool life, and consistent batch-to-batch accuracy.

Bullnose End Mill Product Details

HRC55 4 Flute Bullnose End Mill for Steel

The HRC55 4 Flute Bullnose End Mill for Steel is engineered for high-precision milling in demanding steel applications. With its robust HRC55 hardness, this tool delivers excellent wear resistance and extended tool life. The bullnose design provides a stable cutting edge, reducing edge chipping and enhancing surface finish in 3D profiling and contour machining.

Ideal for both roughing and finishing operations, the 4 flute design ensures efficient chip removal and smooth cutting performance, even in tough steel materials. Whether you are working with alloy steels, carbon steels, or tool steels, this bullnose end mill is designed to maintain high cutting stability and accuracy throughout the process

Order Number:

HN55-C4

In-stock products, fast delivery.

RODS & PREFORMS

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

COATING

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.

Bullnose End Mill Dimensions & Technical Drawings

Our Bullnose End Mill drawings clearly show key Bullnose End Mill dimensions such as diameter, radius, flute length and overall length. This helps you confirm the right Bullnose End Mill sizes for your CNC setup and machining depth before ordering.

FAQ

What materials can HNCabide Bullnose End Mills be used on?

HNCabide bullnose end mills are versatile and can be used on a wide range of materials, including steel, stainless steel, aluminum, and cast iron. They are particularly effective in machining tougher materials, such as hardened steels and alloys, providing excellent durability and cutting precision.

What sizes are available for HNCabide Bullnose End Mills?

HNCarbide offers a range of bullnose end mill sizes to suit various applications. These include smaller diameters, like the 1/8 bullnose end mill for fine detailing, and larger sizes for more aggressive cutting. We also provide options for different flute designs, such as 2 flute for softer materials and 4 flute for harder alloys.

What is the difference between bullnose vs ball nose end mill?

The difference between a bullnose vs ball nose end mill lies in their cutting geometry. A bullnose end mill has a flat edge with a rounded tip, making it ideal for milling corners and edges, with reduced chipping and improved tool stability. In contrast, a ball nose end mill features a fully rounded tip that is better suited for 3D contouring and finishing, especially on curved surfaces. While the ball nose end mill excels in smooth, curved finishes, the bullnose end mill is more versatile for corner and profile cuts.

Do you offer non-standard / customized cutting tools?

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.

Can I get free samples?

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.

Do you support OEM and ODM service?

Yes.

OEM:Your logo and brand on tools, labels and boxes, with agreed MOQ.
ODM:We work with you to design or optimize tools for your market. NDAs can be signed to protect your projects and drawings.

Do you have a distributor / dealer support program? What support can I get?

Yes, for qualified distributors we provide a complete support package:

1.Market protection

Regional or customer protection based on sales targets, avoiding price wars among our partners.

2.Marketing support

Catalogs, brochures, product photos, technical data sheets, online materials.

For key partners, joint promotion, exhibitions and digital marketing support.

3.Stable supply

Safety stock for fast-moving items and forecast-based production.

Priority production and regular shipments to reduce stock-out risk.

4.Worry-free after-sales

Clear quality warranty policy, quick response to claims.

Replacement, credit or other solutions after confirmation of issues.

5.Technical support

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.

HRC60 4 Flute Bullnose End Mill for Stainless Steel

The HRC60 4 Flute Bullnose End Mill for Stainless Steel is designed for high-performance machining of stainless steel and other tough materials. With its HRC60 hardness, this end mill offers exceptional wear resistance, ensuring a longer tool life and consistent performance during demanding machining tasks. The bullnose design provides a strong cutting edge, reducing the risk of chipping and improving the surface finish, especially in 3D profiling and contour operations.

The 4 flute design enhances cutting stability and chip evacuation, making it ideal for both roughing and finishing processes. Its ability to handle high cutting forces ensures efficient and smooth operation, even in the most challenging stainless steel applications.

This end mill is perfect for manufacturers looking for precision and reliability when machining stainless steel alloys, offering superior cutting performance, reduced vibration, and excellent tool longevity.