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Products2 Flute Micro Corner Radius End Mill for Steel - Long Neck Bull Nose Cutter (0.3mm - 1.5mm)
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2 Flute Micro Corner Radius End Mill for Steel - Long Neck Bull Nose Cutter (0.3mm - 1.5mm)

Master micro-machining with our 2 Flute Micro Corner Radius End Mills for steel. Features long neck design for deep rib processing. Diameters from 0.3mm to 1.5mm. High precision AlTiN coating for extended tool life in mold making. Free samples available!

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Product Function

The 2 Flute Micro Corner Radius End Mill (also known as a Bull Nose cutter) is the ultimate tool for precision mold making and micro-machining. It bridges the gap between square end mills and ball nose end mills:
  • Corner Strength: The corner radius (R) prevents the chipping often seen in sharp square end mills, significantly extending tool life in hard steel.
  • Rib Processing: The "Long Neck, Short Flute" design allows the tool to reach into deep cavities and slots (ribs) without the shank rubbing against the workpiece.
  • Flat Bottom Finishing: Unlike ball nose mills, it can machine flat bottoms efficiently while leaving a strong fillet at the corner.

Product Features

  • Micro Precision: Available in ultra-precise diameters from 0.3mm to 1.5mm, including specific fractional sizes like 0.74mm/0.75mm for tight tolerance fittings.
  • Rib Processing Geometry: Features a Stub Flute + Long Neck (Relief) design to maximize rigidity while allowing deep reach.
  • Premium Material: Manufactured from Ultra-Fine Micro Grain Tungsten Carbide to withstand the high deflection forces common in micro-milling.
  • Coating: Advanced AlTiN / TiSiN Coating provides extreme heat resistance and lubricity for machining Carbon Steel, Alloy Steel, and Mold Steel (up to HRC 55).
  • Shank Accuracy: Standard h6 tolerance 4mm shank ensures perfect runout control, which is critical for preventing breakage in micro tools.

Specifications

Micro Corner Radius Series (Standard & Long Neck)

Cutter Diameter (D)
Flute Length (L2)
Effective Length / Neck (L3)
Shank Diameter (d)
Overall Length (L1)
φ0.3
0.6
Std
4
50
φ0.4
0.8
Std
4
50
φ0.5
1.0
Std
4
50
φ0.6
1.2
Std
4
50
φ0.7
1.4
Std
4
50
φ0.74
2.0
Std
4
50
φ0.75
2.0
Std
4
50
φ0.8
1.6
Std
4
50
φ1.0
0.5
2.5 (Neck)
4
50
φ1.0
2.0
Std
4
50
φ1.5
3.0
Std
4
50
φ1.5
6.0
Long Flute
4
50
Note: Standard Corner Radius (R) is typically 0.05R, 0.1R, or 0.2R depending on diameter. Please specify required Radius when ordering.

RPM/Feed Reference (For Steel)

Material: P20, NAK80, S136 (Mold Steel HRC 30-45) *Note: Micro tools require high RPM and low runout (<0.005mm recommended).*
Diameter (mm)
RPM (rev/min)
Feed Rate (mm/min)
Feed per Tooth (fz)
Depth of Cut (Ap)
0.3
25,000 - 40,000
150 - 300
0.003 - 0.005
0.01 - 0.02
0.5
20,000 - 35,000
300 - 600
0.005 - 0.010
0.02 - 0.04
0.8
15,000 - 25,000
400 - 800
0.010 - 0.015
0.05 - 0.08
1.0
12,000 - 20,000
500 - 1000
0.015 - 0.025
0.10 - 0.15
1.5
10,000 - 16,000
600 - 1200
0.020 - 0.035
0.15 - 0.25

Promotion Policy

To support your precision mold making business, we offer:
  1. Free Sample: Test our micro precision risk-free. Free sample available (shipping cost applies).
  1. First Order Coupon: Get **
    50USDOFF∗∗yourfirstorderover50 USD OFF** your first order over
    
    500 USD.
  1. Mold Maker Discount: Specialized discount of 2%~5% for orders over $5000 USD.

Client Benefits

  • Reduced Tool Breakage: The corner radius design is inherently stronger than sharp corner micro mills, saving you money on tool replacements.
  • Deep Rib Access: Our "Long Neck" options (like the
    ϕ1.0×2.5\phi 1.0 \times 2.5
    
    neck) allow you to machine deep, narrow slots without shank interference.
  • Precision Surface Finish: Excellent runout control ensures the walls of your mold cavities are smooth and accurate, reducing manual polishing time.
  • Stock Availability: We keep stock of standard micro sizes to ensure your CNC machines never stop running.

FAQ

Q1: What is the benefit of a Corner Radius (Bull Nose) over a Square End Mill? A: In micro sizes, the sharp corner of a square end mill is the weakest point and breaks easily. A corner radius adds material to this weak point, significantly increasing durability and tool life in hard steel.
Q2: What does "0.5+2.5" mean in the specification? A: This refers to a "Long Neck" design. The actual cutting flute length is 0.5mm, but there is a relieved neck (slightly smaller diameter than the cutter) extending 2.5mm. This allows you to cut a slot 2.5mm deep without the shank rubbing, while keeping the tool rigid.
Q3: Can these cut hardened steel? A: Yes, our coated series is suitable for steels up to HRC 55 (like NAK80, S136). For harder steels (HRC 60+), please contact us for our "Blue Series" High-Hardness tools.
Q4: What is the standard Radius (R) size? A: For micro diameters (0.3-1.0mm), standard radius sizes are usually R0.05 or R0.1. We can customize specific radii based on your drawing requirements.