Osg 8690740 Solid Carbide Screw Machine Drill Bit

Product Description

The OSG 8690740 is a solid carbide screw machine length (stub) drill bit designed for high-performance drilling in demanding production environments. It features a 0.2913 inch (7.40 mm) diameter, a 140-degree split point, and a two-flute spiral configuration for efficient chip evacuation. The EgiAs coating provides enhanced surface hardness and lubricity, extending tool life in abrasive and hard materials. X-thinned web geometry reduces thrust force at the cutting tip. Coolant-through capability supports high-speed, deep-hole drilling in ferrous and non-ferrous metals. This bit is part of OSG Series 6500 and is intended for use by machinists, tool-and-die technicians, and CNC operators in industrial production settings.

This drill bit is suited for screw machine operations, CNC machining centers, and drill press applications where stub-length rigidity is required to minimize deflection. Its straight-cylindrical shank accepts standard drill chucks and collet holders. The 0.2913 inch diameter falls within the 0.2500 to 0.3000 inch range of the Series 6500 product family, making it a direct selection for applications requiring precise 7.40 mm diameter holes. It is commonly used when drilling steel alloys, stainless steel, cast iron, and similar materials where a solid carbide substrate and through-coolant delivery are required to maintain dimensional accuracy and tool life at elevated cutting speeds.

Key Features

• Solid carbide substrate for rigidity and wear resistance in hard materials
• EgiAs coating for reduced friction and extended tool life
• Coolant-through design supports high-speed drilling and chip flushing
• 140-degree point angle reduces thrust and improves self-centering
• X-thinned web geometry lowers cutting forces at entry
• Stub (screw machine) length provides increased rigidity and reduced deflection

Compatibility

Designed as an OEM-style production drill bit within OSG Series 6500, covering the 0.2500 to 0.3000 inch (6.50 to 8.00 mm) diameter range. Fits standard drill chucks and collet systems accepting an 8.00 mm straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or CNC technicians. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the chuck or collet holder. Verify chuck or collet size matches the 8.00 mm shank diameter before clamping. When using coolant-through capability, confirm the machine tool spindle and coolant delivery system are rated for through-tool coolant before operation.