Osg 402-0781-BN Ball End Mill 0.0781 in 2 Flute Carbide

Product Description

The OSG 402-0781-BN is a solid carbide ball end mill designed for precision milling in metalworking and machining applications. It features a 0.0781-inch (5/64-inch) mill diameter with a 0.25-inch length of cut and a 1/8-inch shank diameter, making it well suited for tight-tolerance work in small-bore profiling, contouring, and slotting operations. The two-flute geometry and 30-degree right-hand helix promote chip evacuation and smooth cutting action. Manufactured from micrograin solid carbide, this end mill delivers rigidity and wear resistance at small diameters where tool deflection is a primary concern. It ships as a single-end, uncoated tool in the OSG 402BN series.

This end mill is intended for use by machinists and tooling professionals working on CNC machining centers, manual mills, and die-and-mold applications. Its small diameter makes it appropriate for fine detail work, engraving, and finishing passes on hardened or difficult-to-machine materials. The uncoated finish suits applications where coating adhesion or edge prep would compromise cutting-edge sharpness at this diameter. Overall length is 1.5 inches, keeping the tool compact for use in confined setups or multi-axis fixtures.

Key Features

• 0.0781-inch (5/64-inch) ball end diameter for small-feature and detail milling
• Micrograin solid carbide construction for rigidity and edge retention at small diameters
• 2-flute design with right-hand spiral flutes for efficient chip evacuation
• 30-degree helix angle promotes smooth cutting action and reduced chatter
• 1/8-inch shank diameter with shank tolerance of +0.0000 to -0.0005 inches for accurate tool holding
• Single-end, uncoated configuration in the OSG 402BN series

Compatibility

Designed as an OEM-style tooling option for CNC machining centers and manual mills accepting a 1/8-inch straight shank. Part of the OSG 402BN series of solid carbide ball end mills.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle and tool holder are clean and free of debris before seating the 1/8-inch shank. Use an appropriate collet or end mill holder rated for the shank diameter and verify runout with a dial indicator before beginning cuts. Power down and lock out the machine spindle before changing tooling in accordance with applicable shop safety procedures.