Precision Twist Drill 5996004 Cobalt Drill Bit No. 22

Product Description

The PRECISION TWIST DRILL 5996004 is a high-performance cobalt aircraft extension drill bit designed for drilling in tough, hard-to-reach locations. Built from solid cobalt tool steel with a straw finish, it delivers excellent heat resistance and wear life when cutting through hard metals, stainless steel, and aerospace-grade alloys. The 135-degree split point geometry is self-centering, eliminating the need for a center punch on most surfaces and reducing walking on startup. With a 2-inch flute length and 6-inch overall length, this bit provides extended reach compared to a jobber-length drill. It carries NAS 907 Type J compliance, making it appropriate for aerospace and precision metalworking applications.

This drill bit is well suited for aircraft maintenance, aerospace fabrication, and precision metal fabrication shops where extended reach is required. The No. 22 wire size (0.157 inches diameter) is commonly used for clearance holes, tapping pilot holes, and precision through-holes in structural components. The right-hand spiral flute with web-thinned, tapered web configuration improves chip evacuation and reduces thrust in deep-hole drilling. Licensed trades and skilled metalworkers in aerospace, industrial maintenance, and tool-and-die work will find this bit effective in both hand-held and drill-press applications.

Key Features

• Cobalt tool steel construction for superior hardness and heat resistance when drilling hard metals
• 135-degree split point is self-centering and reduces drill walking without a center punch
• Straw finish provides a degree of lubricity and indicates proper heat treatment
• Extended 6-inch overall length with 2-inch flute length for improved reach in confined areas
• Web-thinned, tapered web reduces cutting resistance and improves chip flow
• NAS 907 Type J compliant for aerospace and precision metalworking standards

Compatibility

Designed as an OEM-style replacement and standard-production cobalt drill bit for use in any standard drill chuck accepting a 0.157-inch straight-cylindrical shank. Fits keyed and keyless chucks on hand drills, drill presses, and magnetic base drills sized to accept the shank diameter.

Installation Notes

This bit is installed and removed by a qualified machinist or maintenance technician using a standard drill chuck rated for the shank diameter. Ensure the drill and workpiece are properly secured before operation, and use appropriate cutting fluid or lubricant when drilling hard metals to extend bit life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed. Disposal of worn cobalt tooling should follow applicable shop safety and hazardous materials procedures.