Accupro 39444 Square End Mill 1/4 in 4 Flute Powdered Metal

Product Description

The ACCUPRO 39444 is a single-end, square-profile end mill designed for general-purpose milling in ferrous and non-ferrous materials. Built from powdered metal, it offers a step up in wear resistance over standard high-speed steel while remaining a cost-effective choice for production and job-shop environments. The cutter runs a 0.25 inch diameter with a 0.625 inch length of cut, a 0.375 inch shank diameter, and a 2.4375 inch overall length. Four spiral flutes and a centercutting geometry allow for both peripheral and plunge milling operations without a pre-drilled entry point.

This end mill is suited for CNC machining centers, knee mills, and manual bridgeports running right-hand spindle rotation. It is appropriate for slotting, profiling, and pocket milling in light to medium-duty applications. The uncoated finish makes it a practical choice for operations using cutting fluid, where coating adhesion is less of a priority than straightforward resharpening or economical replacement.

Key Features

• Powdered metal construction for improved wear resistance over standard HSS
• Four spiral flutes with right-hand cut and right-hand flute direction
• Centercutting design allows direct plunge entry
• 0.25 inch mill diameter with tight tolerance of plus 0.003 / minus 0.000 inches
• 0.375 inch shank diameter with tolerance of minus 0.0001 / minus 0.0005 inches
• Single-end, uncoated, no chipbreaker — straightforward to resharpen

Compatibility

Designed as an OEM-style replacement or direct-fit tooling for standard 3/8 inch collets and end mill holders used in vertical machining centers and manual milling machines.

Installation Notes

Installation is performed by machinists and CNC operators. Secure the shank in a clean, undamaged collet or end mill holder torqued to the machine manufacturer's specification. Inspect the shank and collet bore for chips or runout before seating. Always verify spindle direction is set to right-hand rotation before engaging the cut.