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

High-Quality Mold Steel Corner Radius End Mill - 4 Flutes Φ1-20 at SAMHO

Designed to meet the demands of the most challenging machining operations, our mold steel corner radius end mill ensures smooth cutting and precise corner radii. Its 4-flute construction provides optimal chip evacuation, reducing the risk of tool clogging and maximizing productivity.

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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.

4 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.

Highly recommend

Specialty

Total 72 Models-Unit(Mm)

Milling Conditions

Why Choose SAMHO as Your Supplier for Corner Radius End Mills?

Engineered for High-Hardness Materials (HRC 48–62, up to HRC 65)

This is not a general-purpose end mill series.
It is specifically designed for high-hardness steel machining, including SKD11, D2, H13, and S136.

Key engineering advantages:

Uses ultra-fine grain carbide for superior edge toughness
Designed for stable cutting in heat-treated steels up to HRC 65
Maintains edge integrity under high cutting loads
Performs reliably in dry cutting and MQL environments
Strong resistance to thermal cracking during continuous machining

Reduces edge chipping failure in hardened steel machining, especially in corner radius end mills for hardened steel applications, where stress concentration is critical.

4-Flute Design: Stability, Efficiency, and Surface Finish Balance

The 4-flute geometry is optimized for finishing and semi-finishing hardened steel.

Key benefits:

Higher rigidity reduces tool deflection in deep cavity machining
Improved feed rate capability increases material removal efficiency
More stable cutting engagement improves surface finish consistency
Ideal for finishing operations on steels around HRC 55–62

In real mold machining conditions, the 4-flute structure performs more stably than 2-flute designs.
It also provides better rigidity than 3-flute tools in high-hardness steel finishing.

Corner radius end mills for hardened steel finishing and precision contouring.

Coating + Substrate Synergy for High-Temperature Stability

SAMHO corner radius end mills use advanced nano-scale coating systems (such as TiAlN-based or similar high-performance coatings).

This coating system provides:

High oxidation resistance under elevated cutting temperatures
Lower friction coefficient to reduce cutting heat
Reduced built-up edge (BUE) formation
Improved performance in dry cutting and high-speed machining
Extended tool life in steels above HRC 60

Not just hardness, but stable performance under continuous high-temperature cutting conditions in hardened steel machining.

5-Axis CNC Precision Grinding for Consistency and Repeatability

Tool consistency is critical for global mold manufacturers and OEM users.

SAMHO uses 5-axis precision grinding to ensure:

Stable and accurate corner radius geometry
Consistent cutting edge alignment across batches
Tight control of tool diameter tolerance
Reduced setup adjustments after tool changes
High repeatability in mass production environments

This is especially important for automated machining lines and precision mold production.Reliable batch-to-batch consistency reduces downtime and improves production efficiency when using corner radius end mills for hardened steel applications.

Summary: Why Global Buyers Choose SAMHO

SAMHO corner radius end mills are designed for one clear purpose:
stable and reliable machining of hardened steel.

They deliver:

Strong performance in HRC 48–65 materials
High resistance to edge chipping and thermal failure
Stable cutting in deep cavity and 3D mold machining
Consistent results in batch production environments

For manufacturers working with hardened steel corner radius end mills, SAMHO provides a balance of durability, precision, and process stability that supports real production conditions, not just lab performance.