Colt Industries Pratt & Whitney 13/16-4F Roughing End Mill

This Colt Industries Pratt & Whitney roughing end mill features a 13/16-inch diameter and a four-flute geometry, designed for aggressive material removal in milling operations. Roughing end mills are used to remove bulk stock quickly during the initial stages of machining, laying the groundwork for subsequent finishing passes. The 4-flute configuration provides multiple cutting edges on each revolution, offering rigidity and a steadier cut compared with finer-flute tools, while maintaining enough flute volume to evacuate chips in common metalworking tasks. Brand lineage from Colt Industries and Pratt & Whitney underlines a heritage of precision cutting tools, and this end mill is intended for use with milling setups that accommodate a 13/16-inch diameter cutter. On compatible milling machines, this tool is used for roughing passes that shape pockets, slots, and contours by removing material efficiently before finishing operations. The 13/16-inch diameter and 4-flute geometry identify the basic form and capacity of this end mill, useful for mid-range metalworking tasks.