Osg 17421908 Cobalt Jobber Drill Bit 27/64 in

Product Description

The OSG 17421908 is a cobalt jobber-length drill bit designed for high-performance drilling in ferrous and stainless materials. It measures 27/64 inch (0.4200 inch decimal) in diameter with a 120-degree split point and a V coating for improved wear resistance and chip evacuation. The overall length is 6-1/32 inches, with a 3-15/16 inch flute length. The right-hand spiral flute geometry and R-thinned web reduce thrust and help the bit self-center on entry. Licensed machinists, toolroom techs, and maintenance professionals use this bit where accuracy and tool life in tough materials are required.

This drill bit is suited for production and maintenance drilling in steel, alloy steel, and stainless steel. The cobalt construction handles the heat generated in hard-material applications where standard HSS bits wear prematurely. Typical applications include blind hole drilling, cross-hole drilling, and self-centering operations on structural and machined components. The straight-cylindrical shank seats in standard drill chucks and collet holders without modification. It fits well in both bench drill press and CNC machining center setups.

Key Features

• Cobalt construction with V coating for extended tool life in hard and abrasive materials
• 120-degree drill point angle for reduced thrust and improved chip control
• R-thinned web and tapered web configuration for self-centering entry
• Coolant-through design supports high-feed applications and helps clear chips in deep holes
• Right-hand spiral flute with regular helix for consistent chip evacuation
• Straight-cylindrical shank compatible with standard chucks and collet systems

Compatibility

Designed for use in steel, alloy steel, and stainless steel workpieces. Straight-cylindrical shank fits standard drill chucks and collet holders used in drill presses, lathes, and CNC machining centers.

Installation Notes

This bit should be installed and operated by qualified machinists or toolroom professionals. Secure the shank fully in the chuck or collet and verify runout before drilling. Always power down the machine and follow lockout/tagout procedures before changing tooling. Use appropriate cutting fluid or coolant to protect the bit and workpiece, particularly when drilling stainless steel or alloy steel.