Precision Twist Drill 5996080 Cobalt Drill Bit Wire 39

Product Description

The PRECISION TWIST DRILL 5996080 is a cobalt aircraft extension drill bit designed for drilling into hard metals and high-strength alloys in demanding trade and industrial applications. Built to Series CO501-6 specs, it carries a wire gauge size of 39 (0.0995 inches decimal) and features a 135-degree split point that is self-centering, reducing the need for a center punch on most surfaces. The straw finish indicates heat-treated cobalt construction that resists softening under the high temperatures generated when drilling tough materials. A licensed machinist, aircraft maintenance technician, or industrial maintenance mechanic would typically install this bit in a hand drill, drill press, or right-angle drill motor.

This drill bit is suited for aircraft sheet metal work, heavy fabrication, and general industrial drilling where extended reach is required. The extended overall length of 6 inches gives the bit additional reach in deep cavities, tight bays, or structural assemblies where a standard-length bit cannot access the work surface. The 1.375-inch flute length and 4xD flute-to-diameter ratio provide adequate chip evacuation during short-to-medium-depth drilling operations. It is appropriate for use on steel, stainless, titanium, and other hard alloys where standard high-speed steel bits lose their edge prematurely.

Key Features

• Cobalt tool material resists heat and wear when drilling hard metals and high-strength alloys
• 135-degree split point is self-centering and reduces walking on curved or angled surfaces
• Extended 6-inch overall length provides reach into deep or restricted work areas
• Straw finish indicates heat-treated cobalt construction for extended tool life
• Right-hand spiral flute with tapered web and web-thinned geometry improves chip clearance
• Meets NAS 907 Type J standard for aircraft-quality drill bits

Compatibility

Designed as an OEM-style general-purpose cobalt aircraft extension drill bit conforming to NAS 907 Type J, compatible with standard straight-cylindrical shank chucks accepting a 0.0995-inch shank diameter.

Installation Notes

This bit is installed and operated by machinists, aircraft maintenance technicians, and industrial maintenance mechanics using hand drills, drill presses, or pneumatic drill motors with a compatible chuck. Always power down and lock out the drill motor before changing bits. Use appropriate cutting fluid or lubricant when drilling hard alloys to extend bit life and maintain dimensional accuracy. Inspect the cutting edges before each use and discard bits that show chipping, cracking, or excessive wear.