Promax US556060 Square End Mill 5 Flute Solid Carbide

Product Description

The PROMAX US556060 is a 5-flute square end mill designed for precision milling operations in ferrous and non-ferrous materials. Built from micrograin solid carbide, it delivers the rigidity and edge retention required for high-feed roughing and finishing passes. The PowerLayer coating reduces friction and extends tool life in demanding cutting environments. At 0.25 inches in diameter with a 1-inch length of cut and 3-inch overall length, this tool fits standard 1/4-inch collets and toolholders used across CNC machining centers and manual mills.

This end mill is suited for machinists and tooling specialists running production or job-shop work on vertical and horizontal machining centers. The 38-degree helix angle promotes efficient chip evacuation and helps reduce cutting forces on the workpiece. Variable index flute spacing is incorporated into the design to minimize harmonic chatter during high-speed passes, making it a practical choice for slotting, profiling, and peripheral milling operations where surface finish and dimensional accuracy matter.

Key Features

• 5-flute geometry increases core strength and feed-rate capacity compared to 4-flute designs
• PowerLayer coating reduces heat buildup and improves wear resistance at the cutting edge
• 38-degree right-hand helix for efficient chip evacuation in deep-pocket and slot applications
• Variable index flute spacing minimizes chatter and vibration during high-speed cuts
• Micrograin carbide substrate provides consistent edge sharpness and fracture resistance
• Center-cutting capable, allowing direct plunge entry into the workpiece

Compatibility

Designed as a direct-fit replacement in any application requiring a 1/4-inch straight-cylindrical shank end mill; fits standard ER and straight-bore collet toolholders accepting 0.25-inch shank diameters.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully powered down and locked before changing tooling. Seat the shank to the full recommended insertion depth in the collet or toolholder and torque the retention nut per the toolholder manufacturer specifications. Inspect the cutting edge and coating for chips or damage before each use; a damaged edge can cause workpiece deflection and premature tool failure.