Osg 70720516 Corner Radius End Mill 1/4 in 4 Flute Carbide

Product Description

The OSG 70720516 is a solid carbide corner radius end mill designed for precision milling of non-ferrous metals and graphite. It features a 1/4-inch diameter cutting edge with a 0.03-inch corner radius, four helical flutes ground for right-hand cutting, and a CVD diamond coating that extends tool life in abrasive and high-wear applications. With an overall length of 4 inches and a stub-length flute configuration, this single-end mill is built for rigidity and controlled material removal. Licensed machinists and CNC programmers specify this tool for finishing and roughing passes where edge integrity and dimensional accuracy are critical.

This end mill is suited for milling non-ferrous metals such as aluminum, copper, and brass, as well as graphite and composite materials where a diamond coating provides measurable performance advantages over uncoated or TiN-coated tooling. The extended-reach design with a 3/4-inch reach length and 0.238-inch neck diameter allows access to stepped or recessed features without sacrificing shank rigidity. It mounts in a standard straight-bore toolholder accepting a 1/4-inch cylindrical shank.

Key Features

• CVD diamond coating for superior wear resistance in non-ferrous and graphite applications
• 0.03-inch corner radius reduces stress concentration and improves edge life at part corners
• Four right-hand helical flutes support both roughing and finishing in a single tool
• Extended-reach geometry with 0.238-inch neck diameter for access to recessed features
• Centercutting capable, allowing plunge entry without a pre-drilled pilot hole
• Shank diameter tolerance to h6 for consistent, repeatable toolholder fit

Compatibility

Designed for use with standard straight-bore toolholders accepting a 1/4-inch cylindrical shank. Primary workpiece materials are non-ferrous metals and graphite per OSG Series 7072 application guidelines.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the toolholder is clean and free of chips before seating the shank. Use the appropriate torque specification for the toolholder manufacturer when tightening collet nuts or set screws. Verify runout at the cutting diameter before initiating a production cut, particularly in tight-tolerance applications.