Osg 5687400 Square End Mill 3/32 in 4 Flute Cobalt

Product Description

The OSG 5687400 is a cobalt square end mill designed for precision milling operations in ferrous and high-temperature alloy materials. Built from M42 cobalt high-speed steel, it delivers hardness retention under heat that standard HSS tooling cannot match. The 3/32 inch cutting diameter pairs with a 9/32 inch length of cut and a 30-degree spiral helix for efficient chip evacuation. Four flutes provide a balance of feed rate capacity and surface finish quality. This is a double-end design, offering two usable cutting ends to extend tool life on the shop floor. Licensed machinists and tool room operators are the primary users of this end mill.

The OSG 5687400 is suited for light-duty profiling, slotting, and peripheral milling in steel, stainless steel, and similar materials where cobalt tooling is specified. The long-length classification and 2-5/8 inch overall length allow access to features in deeper workpiece cavities. Its right-hand cut and right-hand flute configuration is standard for conventional CNC and manual milling machines. Center-cutting geometry allows plunge entry directly into the workpiece without a pre-drilled start hole.

Key Features

• M42 cobalt construction for heat resistance and hardness retention during aggressive cuts
• Double-end design provides two cutting ends, extending usable tool life
• Center-cutting geometry allows direct plunge milling without a pilot hole
• 30-degree helix angle promotes smooth chip flow and reduces chatter
• Uncoated finish suitable for use with cutting fluids on cobalt-compatible materials
• Long-length classification with 2-5/8 inch OAL for deeper cavity access

Compatibility

Designed as an OEM-style replacement and standard fitment for 3/16 inch shank collets and end mill holders on conventional and CNC vertical milling machines requiring a 3/32 inch diameter square end mill.

Installation Notes

Installation is performed by qualified machinists using an appropriate collet or end mill holder matched to the 3/16 inch shank diameter. Ensure the machine spindle is fully stopped and locked out before inserting or removing the tool. Use appropriate cutting fluid for the workpiece material to maintain tool life and surface finish. Verify runout at setup and confirm proper tool projection to avoid deflection during light-cut passes.