Precision Twist Drill 5996159 Cobalt Drill Bit Wire 17

Product Description

The PRECISION TWIST DRILL 5996159 is a cobalt aircraft extension drill bit designed for drilling through hard metals, stainless steel, and high-temperature alloys where standard high-speed steel bits fall short. Built to Series CO501-6 specifications, it carries a wire gauge size of 17, equivalent to 0.173 inches in diameter, and features a 135-degree split point for self-centering entry without a center punch. The straw finish indicates a heat-treated cobalt construction suited for demanding production and maintenance drilling applications. Licensed trades and machine operators rely on this bit for accurate, clean holes in tough substrate materials.

This drill bit is intended for use in aircraft, aerospace, and heavy industrial applications where extended reach and cobalt-grade durability are required. With an overall length of 6 inches and a flute length of 2.1875 inches, it provides additional clearance over standard-length jobber bits, making it practical for drilling in recessed or difficult-to-access locations. Its right-hand cutting direction and two-flute spiral configuration are standard for general-purpose metal drilling on drill presses and hand-held power drills.

Key Features

• Cobalt tool material for improved heat and wear resistance in hard-metal drilling
• 135-degree split point with self-centering geometry reduces walk and eliminates need for center punching
• Straw finish indicates heat-treated cobalt construction for extended tool life
• Wire gauge size 17 (0.173 inches) with matching straight-cylindrical shank diameter for consistent chuck fit
• Web-thinned tapered web reduces thrust and improves chip evacuation
• Meets NAS 907 Type J standards for aircraft drilling applications

Compatibility

Designed as an OEM-style replacement and general-use cobalt drill bit conforming to NAS 907 Type J standards, compatible with any standard drill press or hand-held power drill accepting a 0.173-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists, maintenance technicians, or trained tradespeople familiar with metal drilling operations. Secure the workpiece properly before drilling and ensure the drill press or power tool is at the correct RPM for cobalt bits in the target material. Inspect the bit for wear or damage before each use, and replace immediately if the cutting edge is chipped or the flutes are damaged. Use appropriate cutting fluid to prolong bit life when drilling through hard metals or stainless steel.