Osg 10421905 27/64 Inch Cobalt Hss Screw Machine Drill Bit

Product Description

The OSG 10421905 is a screw machine length drill bit designed for high-performance drilling in steel and alloy steel. It measures 27/64 inch (0.4219 inches) in diameter and is manufactured from cobalt high speed steel, which provides increased heat and wear resistance over standard HSS tooling. The 130-degree point angle and R-thinned web reduce entry force and improve chip evacuation. At 4-3/32 inches overall length with a 2-inch flute length, this stub-length geometry provides added rigidity compared to jobber-length bits, making it well suited for CNC machine tools and manual drill presses where deflection control matters.

This drill bit is intended for production and maintenance drilling applications in steel and alloy steel workpieces. The screw machine length format is a standard choice for turret lathes, CNC machining centers, and drill presses where a shorter, stiffer cutting tool improves hole accuracy. The straight cylindrical shank fits standard drill chucks and collet holders. It is sold individually and is appropriate for machine shops, maintenance facilities, and industrial production environments where cobalt tooling is specified for harder or abrasive materials.

Key Features

• Cobalt high speed steel construction for improved heat resistance and tool life in steel and alloy steel
• 130-degree standard point angle with R-thinned web reduces thrust and improves self-centering
• Screw machine (stub) length at 4-3/32 inches overall provides superior rigidity over jobber-length drills
• Right-hand cut with regular spiral flute and tapered web configuration for consistent chip flow
• Straight cylindrical shank compatible with standard drill chucks and collet systems
• Diameter tolerance of +0 to -0.027 mm for consistent hole sizing

Compatibility

Designed for use in steel and alloy steel workpieces. The straight cylindrical shank fits standard drill chucks and collet holders sized for 27/64 inch shank diameter. Intended for use in OSG Series 1000 screw machine length drill bit applications.

Installation Notes

This drill bit is installed and operated by machinists and tool-and-die professionals using standard drill chucks or collet holders. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting that this bit does not support through-coolant delivery. Inspect the cutting edges and web for wear before each use and replace when chipping or excessive wear is observed.