HRC65 Mold Steel Corner Radius End Mill【4 Flutes Φ1-20】

HRC65 Four-Flute Corner Radius End Mill – High-Performance Tool for Machining Hardened Steel (HRC48–62)

Engineered for High-Hardness Steels Like SKD61, S136, and H13

This four-flute corner radius end mill is purpose-built for machining hardened steels in the HRC48–62 range. Its micro-radius design enhances resistance to edge chipping and prolongs tool life during demanding operations.

The corner radius helps reduce stress concentration at the transition between the cutting edge and the workpiece, effectively improving tool strength and fatigue resistance. It is especially suitable for tool steels such as SKD61, S136, and H13.

Ultra-Fine-Grain Tungsten Carbide Substrate for Superior Tool Strength

Manufactured from ultra-fine-grain tungsten carbide substrates (such as K44 or K40 grades), this end mill achieves a substrate hardness of up to HRC65. It delivers outstanding toughness, red hardness, and resistance to thermal cracking—key performance factors when cutting under high heat and heavy loads.

HG Nano Coating for Enhanced Wear Resistance and Thermal Stability

The tool is coated with a high-performance HG nano-coating, providing:

• Surface hardness ≥ HV4000

• Oxidation resistance up to 1100°C

This ensures excellent wear resistance and cutting-edge integrity even under dry or minimum-lubrication conditions, making it ideal for high-speed dry cutting of mold steels.

Four-Flute Geometry for High-Efficiency Machining

The optimized four-flute design enables:

• Higher feed rates

• Efficient chip evacuation

• Improved surface finish

It balances rigidity and cutting performance, making it suitable for both semi-finishing and finishing operations on hardened materials.

Precision CNC Grinding for Dimensional Accuracy

All tools are ground using advanced five-axis CNC grinders to tight tolerances (±0.005 mm), ensuring dimensional stability and repeatability for high-precision part production.

Center Cutting Edge for Axial Plunging

Equipped with a center-cutting design, the end mill supports direct axial entry, allowing for plunging operations in small cavities or blind holes—improving flexibility in mold and die work.