Precision Twist Drill 5996143 Cobalt Aircraft Drill Bit

Product Description

The PRECISION TWIST DRILL 5996143 is a cobalt aircraft extension drill bit designed for precision drilling in hard metals, stainless steel, and high-temperature alloys. Built to Series CO501-6 specs, it carries a 135-degree split point that is self-centering and web-thinned, reducing walking and entry force on tough materials. The straight-cylindrical shank measures 0.201 inches in diameter and seats securely in standard chucks. The straw finish indicates heat-treated cobalt construction. At 6 inches overall length with a 2.4375-inch flute, this bit gives extended reach in aircraft-style drilling applications. Licensed trades and aerospace fabricators reach for this tool when standard-length bits cannot access the work zone.

This bit fits residential, commercial, and industrial drilling tasks wherever a Wire Size 7 (0.201-inch) hole is required with extended reach. The cobalt construction handles interrupted cuts, hard plate, and abrasive materials that would degrade high-speed steel. Right-hand cutting direction with a spiral flute and tapered web configuration supports efficient chip evacuation during deep-hole drilling. It is suited for sheet metal fabrication, structural steel work, and maintenance applications requiring consistent hole geometry over repeated use. The NAS 907 Type J standard designation confirms dimensional and performance compliance for applicable aerospace and precision-trade work.

Key Features

• 135-degree split point is self-centering and reduces drill walking on entry
• Web-thinned, tapered web construction lowers thrust force and improves chip flow
• Cobalt tool material with straw finish resists heat buildup in hard and abrasive metals
• Extended 6-inch overall length provides reach beyond standard jobber-length bits
• Right-hand spiral flute with 4xD flute-to-diameter ratio supports deep-hole chip evacuation
• Meets NAS 907 Type J standards for dimensional and performance consistency

Compatibility

Designed as an OEM-style general-purpose cobalt aircraft extension drill bit compatible with any standard drill chuck accepting a 0.201-inch straight-cylindrical shank.

Installation Notes

This bit is installed and used by machinists, sheet metal workers, maintenance technicians, and trade professionals working with drill presses or hand drills. Secure the shank fully in the chuck before operation and verify chuck key is removed prior to startup. Use appropriate cutting fluid or coolant when drilling hard metals to extend tool life. Inspect the cutting edges for wear or chipping before each use and replace if the split point shows signs of heat damage or deformation.