HRC 70 Ultra Hard End Mills

HRC 70 Ultra Hard End Mills

Our company offers ultra-hard milling cutters designed for machining materials up to HRC 70, making them the ideal solution for high-hardness and high-precision applications. Made from high-quality, fine-grain tungsten carbide with optimized cobalt content, these cutters deliver exceptional hardness, thermal stability, and resistance to chipping and deformation—ensuring reliable performance even under the most extreme cutting conditions.

Precision-engineered with advanced cutting geometries, our HRC 70 milling cutters feature reinforced cutting edges and optimized flute profiles that enhance chip control, reduce cutting forces, and minimize vibration during high-speed machining. This results in smoother tool engagement, improved dimensional accuracy, and consistent performance across long production runs.

To further extend tool life and performance, each cutter is coated with specialized multi-layer coatings such as TiAlN, AlCrN, or diamond-like carbon (DLC) using advanced PVD (Physical Vapor Deposition) technology. These coatings provide superior wear resistance, oxidation protection, and anti-adhesion properties, effectively reducing heat buildup and preventing edge breakdown when machining hardened steels and abrasive materials.

These ultra-hard milling cutters are specifically designed for processing hardened tool steels, die steels, mold steels, high-strength alloys, and other tough materials commonly used in precision tooling, die & mold manufacturing, aerospace, automotive, and medical device industries. Whether performing cavity milling, contouring, or finishing operations on quenched components, our cutters maintain sharpness and accuracy even at elevated hardness levels.

Available in a variety of diameters, lengths, and shank configurations, our HRC 70 milling cutters are compatible with high-speed CNC machines, 5-axis machining centers, and hard milling systems. Each tool undergoes strict quality control and precision grinding to ensure concentricity, edge integrity, and repeatable performance.

Engineered for maximum durability and precision, our ultra-hard milling cutters offer manufacturers a cost-effective, high-performance solution for hard machining—delivering superior surface finishes, extended tool life, and increased productivity in the most demanding applications.

Materials Suitable for Machining

Ultra-hard hardened die steels like heated SKD11 and CR12.

Show Details

 Specitications

Clients Good Feedback

Factory

Service Introduction

Logistics Package

FAQ

Q1: What does "HRC 70 milling cutter" mean?

A1: An HRC 70 milling cutter is specifically engineered to machine materials with hardness up to 70 HRC (Rockwell Hardness C scale). These ultra-hard end mills are manufactured from premium-grade tungsten carbide and feature specialized coatings and geometries to maintain cutting performance and edge integrity when machining hardened steels and high-strength alloys without pre-softening.

Q2: What materials can be machined using your HRC 70 cutters?

A2: Our HRC 70 milling cutters are ideal for machining hardened tool steels, die steels (such as SKD11, D2, H13), mold steels (like NAK80, P20+HRC), carburized steels, bearing steels, and other high-strength materials commonly used in molds, dies, precision components, and aerospace parts. They are also effective on heat-treated alloys and wear-resistant components.

Q3: Why choose an HRC 70 cutter over standard end mills?

A3: Standard end mills are typically designed for softer materials (below HRC 50) and may chip, wear rapidly, or fail prematurely when used on hardened steels. Our HRC 70 cutters are built with enhanced toughness, reinforced edges, and advanced coatings to withstand high cutting resistance and thermal stress, enabling direct machining of hardened parts—eliminating the need for additional heat treatment cycles and improving production efficiency.

Q4: What coating technology do you use for these cutters?

A4: We apply high-performance PVD (Physical Vapor Deposition) coatings such as AlTiN, AlCrN, and TiAlN, and in some cases, diamond-like carbon (DLC). These coatings provide extreme hardness, excellent thermal stability (up to 900°C), and superior resistance to abrasion, oxidation, and built-up edge—critical for maintaining sharpness and tool life during hard milling operations.

Q5: Can these cutters be used in high-speed machining (HSM) and 5-axis applications?

A5: Yes, our HRC 70 milling cutters are precision-balanced and optimized for high-speed machining and 5-axis CNC systems. Their stable cutting geometry ensures smooth engagement, reduced vibration, and consistent performance during complex contouring and deep cavity milling—even on fully hardened workpieces.

Q6: Are HRC 70 cutters suitable for both roughing and finishing?

A: Absolutely. These cutters are engineered for both semi-roughing and finishing operations on hardened materials. With optimized flute design and sharp, durable cutting edges, they efficiently remove material while delivering excellent surface finishes—often eliminating the need for secondary polishing in mold and die applications.