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Products4 Flute Inner R Angle Milling Cutter TISIN Coated Carbide Corner Rounding End Mill for CNC Machining
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Corner Rounding End MillsHRC55PopularReady to Ship

4 Flute Inner R Angle Milling Cutter TISIN Coated Carbide Corner Rounding End Mill for CNC Machining

Boost your CNC precision with our 4 Flute Inner R Angle Milling Cutter. Featuring a high-performance TISIN coating for extreme heat resistance and 55-65 HRC durability. Ideal for smooth corner rounding on hardened steel and alloy. View full specs and bulk discounts here.

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4 Flute Inner R Angle Milling Cutter - TISIN Coated

Product Function

The 4 Flute Inner R Angle Milling Cutter (also known as a Corner Rounding End Mill) is specifically designed for milling precise internal radii and smooth chamfers on workpieces. It effectively removes sharp edges and creates a perfect "R" profile, enhancing both the structural integrity and aesthetic finish of your CNC machined parts.

Product Features

  • Premium Material: Manufactured from high-grade micro-grain tungsten steel for superior hardness and toughness.
  • Advanced TISIN Coating: The Blue TISIN coating provides exceptional thermal stability (up to 900°C) and surface hardness, significantly extending tool life when cutting hardened materials.
  • 4-Flute Design: Engineered for better rigidity and a smoother surface finish, reducing vibration during high-speed machining.
  • High Precision: Tight tolerances on the R-angle and head diameter ensure consistency across batch production.
  • Versatility: Suitable for processing carbon steel, alloy steel, stainless steel, and hardened steel up to HRC 55-65.

Specifications

Our inventory covers a wide range of sizes to meet various machining requirements:
Inner R Angle (mm)
Head Dia. (mm) D
Shank Dia. (mm) d
Overall Length (mm) L
R0.2 - R0.8
3.6 - 2.4
4
50
R1.0 - R1.75
2.0 - 0.5
4
50
R1.5 - R2.5
3.0 - 1.0
6
50
R2.25 - R3.5
3.5 - 1.0
8
50
R3.75 - R4.0
2.5 - 2.0
10
60
R4.5 - R5.0
3.0 - 2.0
12
60
(Note: Detailed head diameter decreases as the R-angle increases within the same shank size to maintain tool geometry.)

RPM/Feed

Disclaimer: The following values are for reference. Adjust based on machine rigidity and coolant conditions.
Workpiece Material
Hardness
Cutting Speed (VC)
Feed per Tooth (fz)
Carbon Steel / Alloy Steel
< 30 HRC
120-180 m/min
0.02 - 0.08 mm/t
Pre-hardened Steel
30-45 HRC
80-120 m/min
0.02 - 0.05 mm/t
Hardened Steel
45-55 HRC
50-80 m/min
0.01 - 0.03 mm/t
Stainless Steel
-
60-100 m/min
0.02 - 0.04 mm/t

Promotion Policy

  1. Free sample: Free sample can be provided, if clients agree to pay for shipping cost.
  1. First order coupon: New clients can enjoy USD50 discount coupon for first order, if the total order amount is more than USD500.
  1. Big order discount: Clients can enjoy 2%~5% discount, if the total order amount is more than USD5000.

Clients Benefits

  • Reduced Tooling Cost: Long-lasting TISIN coating means fewer tool changes and lower cost per part.
  • Superior Surface Finish: High-precision grinding ensures a mirror-like finish on the R-profile, reducing the need for manual polishing.
  • Fast Delivery: Large stock availability for all standard sizes listed above ensures your production line never stops.
  • Technical Support: Our engineering team provides optimized cutting parameters tailored to your specific materials.

FAQ

Q: Can this tool be used for dry cutting? A: Yes, the TISIN coating is designed for high-heat environments, making it suitable for dry cutting or MQL (Minimum Quantity Lubrication).
Q: Do you offer custom R-angles? A: Absolutely. While we stock standard sizes from R0.2 to R5.0, we can manufacture custom specifications based on your drawings.
Q: What is the lead time for bulk orders? A: Standard sizes are in stock and ready to ship within 24-48 hours. Custom orders typically take 7-10 working days.

Looking for more high-performance solutions? Explore our full range of Solid Carbide End Mills to optimize your entire CNC workflow.