Precision Twist Drill 5996007 Cobalt Drill Bit Wire 23

Product Description

The PRECISION TWIST DRILL 5996007 is a cobalt aircraft extension drill bit designed for high-performance drilling in hard and tough materials. Built to Series CO501-6 specifications, this right-hand spiral-flute drill features a 135-degree split point that is self-centering, reducing the need for a center punch and minimizing walking on entry. The wire size 23 designation corresponds to a decimal diameter of 0.154 inches. The straw finish indicates heat treatment applied during manufacturing. With a 2-inch flute length and 6-inch overall length, this extended-reach bit is suited for applications where a standard-length drill cannot access the work area. Cobalt construction provides superior heat resistance compared to standard high-speed steel.

This drill bit is intended for use in aerospace, metalworking, and general manufacturing environments where drilling into stainless steel, titanium, heat-resistant alloys, and other hard metals is required. The extended 6-inch overall length makes it particularly useful for drilling through structural members, deep bores, or confined spaces common in aircraft and heavy fabrication work. It is installed in standard drill chucks and drill motors accepting a straight cylindrical shank. Machinists, toolmakers, and aircraft maintenance technicians are the primary users of this bit.

Key Features

• Cobalt tool material for heat resistance and durability in hard metals
• 135-degree split point is self-centering for accurate, walk-free entry
• 6-inch overall length provides extended reach over standard-length bits
• Straw finish applied during manufacturing indicates cobalt heat treatment
• Web-thinned tapered web reduces thrust and improves chip clearance
• Meets NAS 907 Type J standards for aerospace drilling applications

Compatibility

Designed as a Series CO501-6 aircraft extension drill bit compatible with standard drill chucks accepting a 0.154-inch straight cylindrical shank, for use in hard and abrasive metal drilling applications.

Installation Notes

This bit is installed by machinists and aircraft maintenance technicians in handheld drill motors or drill presses equipped with a compatible chuck. Ensure the shank is fully seated and the chuck is firmly tightened before use. Use appropriate cutting fluid or lubricant when drilling stainless steel or titanium to extend bit life and manage heat buildup. Do not exceed the recommended feed rate for the material being drilled, as cobalt bits can fracture under excessive side load.