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ProductsExtra Long Flute Micro End Mill for Steel HRC55 - 2 Flute, Extended Cutting Length
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Extra Long Flute Micro End Mill for Steel HRC55 - 2 Flute, Extended Cutting Length

High-performance micro end mill with extra long cutting length (up to 10xD). 2 flutes, AlTiN coated for steel HRC55. Ideal for deep slotting and side milling of thick workpieces.

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Extra Long Flute Tungsten Carbide Micro End Mill (For Steel HRC55)

Tackle deep slots and thick workpieces in a single pass with our Extra Long Cutting Length (Long Flute) Micro End Mills.
Unlike standard end mills or long-neck tools (where only the shank is relieved), this series features an extended cutting flute, allowing for continuous side milling and deep slotting without step-downs. Engineered with a rigid 4mm shank and AlTiN coating, it provides exceptional stability when machining Steel up to HRC55.

Key Features & SEO Benefits

  • Extra Long Cutting Length (Up to 10xD): Flute lengths extend up to 10 times the cutter diameter (e.g., 1.0mm diameter with 10mm flute), enabling the machining of thick walls and deep layers.
  • High Rigidity Design: Despite the long flute, the standard 4mm shank provides the necessary base rigidity to minimize deflection and chatter.
  • AlTiN Coating for HRC55: Advanced coating technology ensures high heat resistance and extended tool life in Carbon Steel, Alloy Steel, and Cast Iron.
  • 2-Flute Geometry: Optimized for chip evacuation in deep vertical cuts, preventing chip packing in deep slots.

Applications

  • Deep Slotting: Cutting deep channels where chip evacuation from the entire depth is required.
  • Side Milling (Profiling): Finishing tall vertical walls in a single pass to ensure a seamless surface finish (no step marks).
  • General Steels: Suitable for P (Steel), M (Stainless), and K (Cast Iron) ISO materials.

Technical Specifications

Shank Diameter: 4.0mm (Standard h6 tolerance) Coating: AlTiN (Black/Dark Grey) Helix Angle: 35°
(Find your Cutter Diameter and select the required Flute Length L2)
Cutter Diameter (
ϕ\phi

)
Available Cutting Lengths (L2) (Multiple depth options available)
Overall Length (L1)
0.2 mm
0.5, 0.6 mm
50 mm
0.3 mm
1.0, 1.5, 2.0 mm
50 mm
0.4 mm
1.0, 1.5, 2.0, 2.5, 3.0 mm
50 mm
0.5 mm
1.5, 2.0, 2.5, 3.0, 3.5, 4.0 mm
50 mm
0.6 mm
1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0 mm
50 mm
0.7 mm
2.0, 2.5, 3.0, 3.5, 4.0, 5.0 mm
50 mm
0.8 mm
2.0, 2.5, 3.0, 3.5, 4.0, 5.0 mm
50 mm
0.9 mm
2.0, 3.0, 4.0, 5.0 mm
50 mm
1.0 mm
4, 5, 6, 7, 8, 10 mm
50 mm
1.1 mm (Custom)
See 1.0mm or 1.2mm options
50 mm
1.2 mm
5, 6, 8 mm
50 mm
1.3 mm
5, 6, 8 mm
50 mm
1.4 mm
6, 8, 10 mm
50 mm
1.5 mm
5, 6, 7, 8, 10, 12 mm
50 mm
1.6 mm
6, 8, 10 mm
50 mm
1.8 mm
6, 8, 10 mm
50 mm
2.0 mm
8, 10, 12 mm
50 mm
2.5 mm
10, 12, 14 mm
50 mm
3.0 mm
12, 14, 16 mm
50 mm

Usage Tips for Long Flute Tools

  • Deflection Warning: Long flutes are more prone to deflection than standard tools. Reduce your feed rate (F) by 20-30% compared to standard length end mills.
  • Stepover (Ae): For side milling with the full flute length, keep radial engagement (Ae) low (e.g., 5-10% of Diameter) to maintain accuracy.
Need a specific length not listed? We support OEM customization!