Promax 156-44024 Corner Radius End Mill 5/8 in 4 Flute

Product Description

The PROMAX 156-44024 is a solid carbide corner radius end mill engineered for demanding metal removal in steel, stainless steel, superalloys, and titanium. It carries a 0.75 inch mill diameter, a 0.03 inch corner radius, and an AlTiN (aluminum titanium nitride) PVD coating that extends tool life under high-heat cutting conditions. With 4 flutes, a high helix angle, and a variable index design, it balances aggressive stock removal with a quality surface finish in a single setup. Licensed machinists and tool-and-die professionals reach for this geometry when both roughing and finishing passes are required in hard, abrasive workpiece materials.

This end mill suits CNC machining centers and manual mills in job shop, aerospace, and general metalworking environments. The short-length configuration keeps rigidity high, making it a practical choice for shoulder milling, profiling, and contouring operations where corner chipping is a concern. The 0.03 inch corner radius reduces stress concentration at the cutting edge, extending tool life compared to a sharp-corner end mill in the same material class.

Key Features

• AlTiN PVD coating provides high-temperature oxidation resistance for cutting steel, stainless steel, superalloys, and titanium
• Variable index flute spacing reduces harmonic vibration and chatter during cuts
• 0.03 inch corner radius protects the cutting edge and improves surface finish at workpiece corners
• Centercutting geometry allows plunge and ramp entry without a pre-drilled hole
• Right-hand cut and right-hand spiral with coarse pitch optimized for chip evacuation in tough alloys
• Micrograin solid carbide substrate delivers hardness and wear resistance beyond high-speed steel tooling

Compatibility

Designed for use with standard straight-cylindrical toolholders accepting a 0.625 inch shank diameter. Suitable for CNC machining center spindles and manual milling machines configured for right-hand rotation. Primary workpiece materials are steel, stainless steel, superalloys, and titanium (material codes P, M, S).

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the machine spindle is fully powered down and locked out before inserting or removing tooling from the holder. Confirm runout within acceptable tolerance at the shank before starting a cut, as excessive runout accelerates edge wear on carbide tools. Verify coolant strategy before use, as this tool is not configured for through-coolant delivery and relies on flood or mist coolant applied externally.