HRC 65 Long Flute Square End Mill 4 Flutes

Feature

• YDH99 Series End Mills are manufactured using YIDA’s highest-grade carbide substrate and combined with a TiSiN (Si) coating to deliver outstanding high-speed cutting performance.
• Designed specifically for machining high-hardness workpieces ranging from HRC 55–65, YDH99 Series combines a premium carbide substrate with a high-performance coating specially developed for extremely hard materials. This series delivers exceptional high-speed cutting performance in high-hardness machining, achieving fast, aggressive, and precise machining for outstanding productivity and cost efficiency.
• YDH99 Series is mainly divided into six major tool types: Square End Mills, Ball Nose End Mills, Corner Radius End Mills, Heavy Cutting End Mills, Unequal Helix End Mills, and Roughing End Mills.
• Square End Mills feature sharp cutting edges and are available in 2-, 3-, 4-, and 6-flute configurations, allowing customers to select the most suitable flute design according to their specific cutting requirements.
• Ball Nose End Mills feature a rounded cutting edge and are particularly suitable for contour milling and die & mold machining. Their design facilitates more efficient chip evacuation, contributing to improved machining performance.
• Corner Radius End Mills are designed with a small radius at the cutting edge tip. This rounded edge design enhances tool life and cutting durability while also improving machining efficiency and overall productivity.
• Heavy Cutting End Mills feature a specially designed U-shaped flute geometry that provides improved chip evacuation and enhanced cutting stability. The optimized flute design helps reduce chip accumulation during deep slotting and pocketing operations, making these tools suitable for high-efficiency machining of hardened materials.
• Variable Pitch End Mills feature an unequal flute spacing design that effectively reduces cutting vibration and harmonics during machining. By distributing cutting forces more evenly, the variable pitch geometry provides improved machining stability, better surface finish, and enhanced tool life, especially in high-speed and high-hardness applications.
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• Roughing End Mills are designed with a specialized roughing tooth geometry to achieve high material removal rates while reducing cutting resistance. The flute design promotes efficient chip evacuation and enables stable, high-efficiency rough machining of hardened materials. These tools are ideal for quickly removing large amounts of material prior to finishing operations.