Premium 4-Flute Solid Carbide End Mills with TiSiN Bronze Coating | High-Performance CNC Milling Cutters for HRC40-55 Pre-Hardened Steel

Industrial-grade 4-flute carbide end mills featuring advanced nano-TiSiN bronze coating and unequal helix design. Perfect for high-speed dry machining of HRC40~55 mold steels (S136, P20, NAK80). Reduce tool wear and stop breakage. In stock & custom sizes available. Buy factory-direct!

Our industrial-grade 4-flute solid carbide end mills are engineered specifically for high-speed, high-precision machining of pre-hardened and tempered mold steels. Featuring an ultra-fine grain tungsten carbide substrate and a premium heat-resistant TiSiN bronze nano-coating, these milling cutters deliver exceptional tool life, superior surface finishes, and maximum metal removal rates (MRR) under demanding CNC workshop conditions.

• Hardness + Toughness Balance: Made from 100% virgin ultra-fine grain tungsten carbide rods to ensure high wear resistance without sacrificing impact toughness.
• Optimized for HRC40~55: Perfectly suited for tougher materials including S136, P20, NAK80, and Cr12MoV. Say goodbye to frequent tool chipping during roughing and premature wear during finishing.
• High Structural Stability: Uniform material density and minimal internal residual stress prevent tool deflection during high-speed cutting, ensuring batch machining dimensional consistency.

• 900°C+ Thermal Shield: The premium bronze-colored Titanium Silicon Nitride (TiSiN) nano-coating withstands extreme cutting temperatures up to 900°C+, making it perfect for high-speed dry milling without large amounts of coolant.
• Anti-Galling & No Built-Up Edge (BUE): Prevents chips from welding onto the cutting edges. Smooth chip evacuation eliminates workpiece sidewall scoring or scratching.
• Extended Tool Life: Lower friction coefficient reduces cutting resistance, boosting tool longevity by 30% to 50% compared to standard black-coated end mills under identical parameters.

• Anti-Vibration Design: Unequal flute spacing disrupts cutting harmonics, drastically eliminating chatter marks at high RPMs. Delivers mirror-like surface finishes so you can skip secondary polishing.
• Large Helix Evacuation Groove: Wide, polished chip pockets allow smooth curl and rapid chip flow. Prevents chip packing during deep-slotting and deep-cavity milling.
• Micro-Corner Protection: Precision-honed corner radiuses eliminate micro-chipping risks, providing crisp, clean 900-degree shoulder and slot milling.
• 5-Axis Precision Grinding: Sharp, light-cutting edges reduce spindle loads and save machine energy while prolonging CNC machine life.
• h6 Precision Shank Tolerance: Mirror-ground cylindrical shank ensures minimal runout (T.I.R) when clamped in ER or hydraulic chucks, guaranteeing absolute dimensional stability.

• Drastic Inventory Reduction: This versatile all-in-one cutter handles roughing, semi-finishing, and high-speed finishing across half of your shop’s steel catalog. Cut down your tool stock and carrying costs instantly.
• 3X Efficiency Boost: Run up to 3 times faster speeds and feeds compared to traditional High-Speed Steel (HSS/white steel) tooling.
• Halved Tooling Costs: Doubles the lifespan of standard generic carbide tools, bringing down your total cost-per-part significantly.
• Full Size Range Availability: Standard lengths and extra-long variants are fully stocked and ready to ship. We also offer fast turnaround on customized total lengths and cut lengths to fit your specific machining setup.