4f Flat Endmill with Silicon-Based High-Hardness Coating. High Hardness Coating: Features Silicon-based, AlTiN, TiAlN, and DLC coatings for superior wear resistance. Wide Material Compatibility: Suitable for machining steel, stainless steel, cast iron, copper, and alloys up to 65 HRC. Submicron Grain Carbide: Utilizes YG10X and K44 carbide with grain sizes as small as 0.5um for enhanced durability. Fast Delivery: Standard sizes in stock with dispatch within 24 hours; bulk orders in 7-30 workdays. Customization Options: Accepts special orders for coating, tooth form, structure, and material specifications. Multiple Flute Options: Available in 2, 3, and 4 flute configurations including ball nose and flattened endmills. Precise Tolerance: Manufactured with h6 tolerance to ensure high precision in CNC milling and cutting. Various Helix Angles: Offers helix angles from 10 to 55 degrees to optimize cutting performance for different materials.