Long Reach End Mills

HNCarbide offers a focused range of long reach end mills for accurate machining in deep cavities, narrow pockets and other hard-to-reach areas. Compared with standard tools, a long reach end mill helps reduce vibration, improve surface finish and keep dimensional accuracy when the cutting length is much longer than the diameter.

Using advanced CNC grinding and strict ISO-based quality control, our tools cover practical options from small long reach miniature end mills for fine details to robust designs for heavier side milling. You can choose dedicated long reach end mills for aluminum with sharp edges and polished flutes, or long reach ball end mills for smooth 3D contouring and mold work. For daily production, HNCarbide supports you with stable performance, consistent quality and flexible choices in diameters, lengths and long reach end mill bits for different setups.

Our Long Reach End Mills Product Range

HN55-LNB2 Read More HN55-LNS2 Read More HN55-LNS4 Read More HN55-MLNB2 Read More HN65-LNB2 Read More HN65-MLNB2 Read More HN65-MLNS2 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.

Long Reach End Mills Product Details

55HRC 2 flute ball long reach end mills

HNCarbide’s 55HRC 2 flute ball long reach end mills are designed for precise finishing in deep cavities, slots and narrow pockets when machining alloy steel and pre-hardened steel up to 55 HRC. As part of our long reach end mills range, these tools use a 2-flute long reach ball end mill design to balance rigidity, chip evacuation and smooth 3D surface finishes in mold and die work. Optimized ball geometry and neck relief help reduce vibration and improve tool life, making these long reach ball end mills a reliable choice for stable high-speed finishing in demanding deep-reach applications.

Order Number:

HN55-LNB2

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.

Long Reach End Mills Dimensions & Technical Drawings

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

FAQ

What are long reach end mills and when should I use them?

Long reach end mills are solid carbide tools with an extended cutting length or reduced neck, designed to machine deep pockets, tall walls and features that are far from the clamping surface. You should use a long reach end mill when:

A standard end mill or holder would collide with the workpiece or fixtures.
You need to finish ribs, slots or cavities several times deeper than the tool diameter.
You want to keep the setup simple instead of using special extensions or multiple step operations.

By using the correct length and diameter, long reach tools help you keep tolerances and surface finish under control in difficult-to-access areas.

Can I use long reach end mills for aluminum and other non-ferrous materials?

Yes. HNCarbide offers dedicated long reach end mills for aluminum optimized for high chip volume and low cutting forces. These tools use:

Sharp, high-rake cutting edges to shear soft materials cleanly.
Large flute spaces and polished flutes to prevent chip packing.
Optional corner protection for better tool life in high-speed machining.

With the correct coolant and chip evacuation, long reach aluminum tools can rough and finish deep pockets efficiently without sticking or built-up edge.

When should I choose a long reach ball end mill instead of a square type?

A long reach ball end mill is ideal for 3D surface work and blending operations where you don’t need sharp corners. Typical uses include:

Finishing sculpted surfaces on moulds, dies and aerospace parts.
Blending step marks after roughing in deep cavities.
Machining fillets, radii and complex organic shapes.

Square long reach end mills are better for floors, shoulders and sharp features, while long reach ball end mills shine in applications where smooth transitions and small cusp heights are more important than corner sharpness.

What information do I need to select the correct long reach end mills from HNCarbide?

To recommend the best long reach end mills, we normally ask for:

Workpiece material and hardness range.
Required feature type: deep pocket, rib, slot, 3D surface, etc.
Maximum reach length, minimum corner radius and available holder length.
Machine type (BT/HSK/ER, spindle speed, coolant conditions).

With this data, we can suggest suitable diameters, flute counts, coatings and whether a standard long reach end mill, extra long reach carbide end mills or a long reach ball end mill is the most efficient choice.

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.

55HRC 2 flute square long reach end mills

HNCarbide’s 55HRC 2 flute square long reach end mills are built for accurate side milling, slotting and contouring in alloy steels and pre-hardened steels up to 55 HRC. As part of our long reach end mills range, the 2-flute square design offers sharp cutting edges and efficient chip evacuation, giving better stability and surface finish in deep cavities and narrow pockets than a standard long reach end mill. With optimized relief and flute geometry, these long reach end mill bits help reduce vibration, extend tool life and keep tolerances under control in high-speed production. Available in several reach lengths and diameters, these extra long reach carbide end mills also help reduce tool changes and simplify programming on complex parts.