Osg 10312505 Screw Machine Drill Bit 5/16 in Cobalt

Product Description

The OSG 10312505 is a screw machine length drill bit designed for high-performance drilling in steel and alloy steel. Built from cobalt high speed steel with a coated finish, this bit handles demanding applications where standard HSS tooling falls short. It features a 5/16 inch (0.3125 inch) diameter, a 130-degree drill point angle, and a right-hand spiral flute with web thinning to reduce thrust and improve chip evacuation. At 3-7/16 inches overall length, the screw machine format provides rigidity in close-quarters setups. Licensed machinists, tool-and-die techs, and metalworking professionals are the primary users.

This bit is suited for production and maintenance drilling operations in steel and alloy steel workpieces. The shorter screw machine length makes it well-matched for drill press work, CNC machining centers, and hand-held drilling where a stub-style bit is needed for stability and reduced deflection. The straight-cylindrical shank fits standard three-jaw chucks without adapters.

Key Features

• Cobalt high speed steel construction for heat and wear resistance in ferrous metals
• 130-degree drill point angle with R-thinned web for reduced entry thrust
• Regular spiral flute with 1-5/8 inch flute length promotes chip clearance
• Screw machine length (3-7/16 inches overall) for rigidity in tight setups
• Straight-cylindrical shank fits standard chucks without adapters
• Diameter tolerance of +0 to -0.022 mm for consistent hole sizing

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for production and maintenance drilling operations in steel and alloy steel applications. Part of the OSG Series 1000 lineup.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with metalworking equipment and tooling standards. Ensure the spindle or chuck is fully powered down and locked out before changing bits. Verify chuck jaw condition and ensure the straight shank is fully seated and tightened before operation. Do not exceed the recommended feed and speed parameters for cobalt HSS tooling in the target workpiece material.