Osg 8691290 Solid Carbide Stub Drill Bit 0.5079 in

Product Description

The OSG 8691290 is a solid carbide stub-length (screw machine length) drill bit designed for precision hole-making in demanding machining applications. Measuring 0.5079 inches (12.90 mm) in diameter with a 140-degree split point, this bit delivers clean entry and reduced thrust in hard and abrasive materials. The EgiAs coating provides enhanced wear resistance and thermal stability. Coolant-through capability supports high-speed drilling in deep or difficult-to-machine workpieces. It features a straight-cylindrical shank measuring 13.00 mm, making it compatible with standard drill chucks and toolholders. The X-thinned web reduces cutting resistance and improves chip evacuation. Part of the OSG Series 6500, this bit is suited for production environments where consistency and tool life are critical.

This drill bit is used in CNC machining centers, drill presses, and manual machine setups across metalworking, aerospace, automotive, and general fabrication shops. The stub-length body provides increased rigidity compared to jobber-length bits, making it the preferred choice when drilling in tight clearance zones or when minimizing deflection in harder alloys and stainless steels. It is typically installed and operated by machinists and tool-and-die professionals working within a size range of 0.5000 to 0.6000 decimal inch (11.00 to 13.50 mm).

Key Features

• Solid carbide construction for extended tool life in hard and abrasive materials
• 140-degree point angle reduces thrust and improves self-centering on entry
• EgiAs finish provides wear and heat resistance for high-speed applications
• Coolant-through design supports chip evacuation in deep-hole drilling
• X-thinned web reduces cutting resistance and lowers torque requirements
• Stub-length body maximizes rigidity and minimizes deflection

Compatibility

Designed for use in the 0.5000 to 0.6000 decimal inch (11.00 to 13.50 mm) drill bit size range as part of the OSG Series 6500 stub-length carbide drill lineup. Fits standard toolholders and drill chucks accepting a 13.00 mm straight-cylindrical shank.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with carbide tooling. Ensure the machine spindle and toolholder are clean and free of runout before seating the shank. Carbide tooling is brittle — avoid interrupted cuts or side loading that could cause chipping or fracture. Activate coolant flow before engaging the workpiece when using the through-coolant feature.