Osg 8690990 Solid Carbide Stub Drill Bit 0.3898 in

Product Description

The OSG 8690990 is a solid carbide screw machine length drill bit designed for high-precision drilling in demanding production environments. Built to Series 6500 specifications, this stub-length drill measures 0.3898 inches (9.90 mm) in diameter with a 140-degree point angle for improved centering and reduced thrust. The EgiAs coating provides enhanced wear resistance and lubricity, extending tool life in ferrous and non-ferrous materials. Coolant-through capability supports high-speed drilling applications where heat management is critical. This bit is suited for CNC machining centers and drill presses operated by machinists and tool-and-die professionals.

This drill bit is intended for screw machine and short-hole drilling applications where rigidity and runout control are priorities. The stub length reduces deflection compared to jobber-length bits, making it well suited for production drilling in tight setups or shallow-depth holes. The straight-cylindrical shank fits standard drill chucks and collet holders. Applications include precision hole making in metal fabrication, automotive components, aerospace parts, and general machining operations requiring tight tolerances.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard or abrasive materials
• EgiAs finish for improved lubricity and extended tool life
• 140-degree point angle reduces walking and improves entry accuracy
• Coolant-through design supports high-speed and deep-hole drilling
• X-Thinned web reduces cutting forces and improves chip evacuation
• Spiral flute geometry promotes consistent chip clearing in blind and through holes

Compatibility

Designed as an OEM-style screw machine length drill bit fitting standard straight-cylindrical shank drill chucks and collet holders in the 0.3500 to 0.4000 inch (9.50 to 11.00 mm) diameter range.

Installation Notes

Installation and tool changes should be performed by qualified machinists with the spindle fully powered down and locked out per applicable machine guarding standards. Verify chuck or collet runout before use to protect the carbide shank from fracture. Coolant-through setups require compatible toolholders and adequate coolant pressure as specified by the machine manufacturer. Handle solid carbide tooling carefully to avoid chipping edges during setup.