Precision Twist Drill 5995845 Cobalt Extension Drill 5/32 in

Product Description

The PRECISION TWIST DRILL 5995845 is a cobalt aircraft extension drill bit designed for high-performance drilling in tough materials. Built to Series CO500-6 standards, this bit features a 5/32-inch diameter (0.1563 inches decimal) with a 2-inch spiral flute length and a full 6-inch overall length, giving technicians extended reach in deep or obstructed bore applications. The 135-degree split point is self-centering and web-thinned, reducing the need for a center punch and minimizing walking on hard surfaces. A straw finish indicates the cobalt heat treatment applied during manufacturing. Installed by machinists, maintenance technicians, and trade professionals working with structural metals, stainless, or hardened alloys.

This drill bit is suited for general-purpose drilling in aerospace, HVAC, plumbing, and industrial fabrication environments where a standard-length bit cannot reach. The extended 6-inch body makes it practical for drilling through thick structural members, channel iron, deep flanges, or framed assemblies. The right-hand cutting direction is compatible with all standard drill drivers and drill presses. The straight-cylindrical shank seats securely in standard three-jaw chucks without additional adapters.

Key Features

• Cobalt construction for heat resistance and durability in hard or abrasive materials
• 135-degree split point with self-centering geometry reduces walking and eliminates center punch step
• Web-thinned tapered web lowers thrust force and improves chip evacuation
• 6-inch overall length provides extended reach in deep or confined drilling locations
• 2-inch spiral flute length (4xD ratio) supports effective chip clearance
• Straw finish indicates cobalt heat treatment for surface hardness
• Meets NAS 907 Type J standard

Compatibility

Designed as a general-purpose cobalt extension drill bit compatible with standard three-jaw drill chucks accepting a 5/32-inch straight-cylindrical shank.

Installation Notes

This bit is installed by machinists and trade professionals using standard drill presses, hand drills, or magnetic-base drills. Secure the straight-cylindrical shank firmly in the chuck before operation and verify correct chuck capacity for a 5/32-inch shank. Use appropriate cutting fluid or lubricant when drilling stainless steel or hardened alloys to extend bit life and reduce heat buildup. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is present.