Osg 5677600 Square End Mill 1/8 in 4 Flute Cobalt

Product Description

The OSG 5677600 is a double-end cobalt square end mill designed for metal cutting applications in machining environments. Built from M42 cobalt high-speed steel, it delivers improved heat resistance and wear life compared to standard HSS tooling. The mill features a 0.125-inch diameter, a 0.375-inch length of cut, and four right-hand spiral flutes with a 30-degree helix angle. It is center-cutting, allowing plunge cuts in addition to peripheral and slot milling. The bright, uncoated finish suits a range of workpiece materials and makes it easy to inspect for wear. Series 567 designates the OSG regular-length double-end geometry.

This end mill is suited for general-purpose slot milling, profiling, and step milling on ferrous and non-ferrous materials. Its compact 0.125-inch diameter makes it applicable for fine-feature work, narrow slots, and detail passes where larger tooling cannot fit. The double-end configuration provides two usable cutting ends, extending tool life between replacements. Typical install and operation is performed by machinists and tool-and-die tradespeople working on CNC machining centers, knee mills, or manual milling machines.

Key Features

• M42 cobalt high-speed steel construction for elevated heat resistance and extended tool life
• Double-end design provides two cutting ends per tool
• Center-cutting geometry allows direct plunge entry into workpiece
• 4 right-hand spiral flutes at 30-degree helix for efficient chip evacuation
• Bright, uncoated finish for easy wear inspection across a range of materials
• Regular-length Series 567 profile for standard reach machining

Compatibility

Designed as an OEM-style replacement or direct fitment end mill for standard 3/16-inch collets or end mill holders on CNC and manual milling machines accepting a 0.1875-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist. Ensure the milling machine spindle is fully powered down and locked before changing tooling. Secure the shank to the specified depth in a properly sized collet or end mill holder and torque the retention hardware per the machine manufacturer's guidelines. Verify runout with a dial indicator before beginning a cut to avoid premature tool failure or dimensional error.