Osg 8691090 Carbide Screw Machine Drill Bit 0.4291 in

Product Description

The OSG 8691090 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding industrial and metalworking applications. Built to Series 6500 standards, it features a 0.4291-inch (10.90 mm) diameter, a 140-degree split point, and a coated finish for extended tool life and reduced heat buildup. The right-hand spiral flute geometry, combined with R-thinned web configuration, promotes efficient chip evacuation and reduced thrust force at entry. Coolant-through capability makes it well-suited for deep-hole operations in production environments. Licensed machinists, tool-and-die makers, and CNC operators are the primary users of this bit.

This drill bit is engineered for use on ferrous and high-strength workpiece materials including steel, alloy steel, cast iron, titanium, and titanium alloys. The screw machine length profile — shorter overall length compared to jobber bits — provides increased rigidity and accuracy, making it a preferred choice for turret lathes, screw machines, and CNC machining centers where overhang and deflection must be minimized. The 3xD flute-to-diameter ratio supports controlled chip flow during continuous cutting cycles.

Key Features

• Solid carbide construction for superior hardness and wear resistance in ferrous and titanium workpiece materials
• 140-degree drill point angle with R-thinned web for reduced entry thrust and accurate self-centering
• Coated finish extends tool life and reduces built-up edge in high-speed applications
• Coolant-through design supports deep-hole drilling and chip flushing in production environments
• Straight-cylindrical shank (11.00 mm) compatible with standard collets and drill chucks
• Regular spiral, 2-flute configuration promotes efficient chip evacuation

Compatibility

Designed for use in screw machines, turret lathes, and CNC machining centers. Suitable for drilling steel, alloy steel, cast iron, titanium, and titanium alloys within the 0.4000 to 0.4500-inch (9.50 to 11.00 mm) diameter range. Part of the OSG Series 6500 high-performance drill line.

Installation Notes

Installation and operation should be performed by qualified machinists or CNC technicians familiar with tooling setup and safe machine operation. Ensure the machine spindle is fully stopped and de-energized before inserting or removing the bit from the tool holder. Verify that the collet or chuck bore matches the 11.00 mm shank diameter to ensure secure clamping and runout control. Always confirm coolant-through supply is properly connected and flowing before initiating deep-hole cycles.