Precision Twist Drill 5996116 Cobalt Drill Bit No. 49

Product Description

The PRECISION TWIST DRILL 5996116 is a cobalt aircraft extension drill bit designed for drilling into hard metals and high-strength alloys in aerospace and industrial applications. Built to Series CO501-6 standards and conforming to NAS 907 Type J, this bit 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 No. 49 cutting diameter measures 0.073 inches. The straw finish indicates a heat-treated cobalt steel construction suited for tougher materials. With a 1-inch flute length and 6-inch overall length, it is sized for extended-reach work in confined or deep locations. Licensed HVAC techs, machinists, and aviation maintenance technicians are the typical installers.

This drill bit is built for general-purpose extended-reach drilling in hard metals, stainless steel, titanium, and high-temperature alloys. The extra overall length of 6 inches makes it suitable for applications where standard-length bits cannot reach the work surface. It is appropriate for both production shop environments and field service maintenance situations where precision hole sizing to wire gauge No. 49 is required. The right-hand spiral flute with web-thinned, tapered web configuration promotes efficient chip evacuation during drilling.

Key Features

• Cobalt tool steel construction for drilling hard and abrasive metals
• 135-degree split point is self-centering and reduces walking on entry
• Straw finish indicates heat treatment for improved hardness and wear resistance
• 6-inch overall length provides extended reach for confined or deep access drilling
• Web-thinned tapered web reduces thrust and improves chip clearance
• Conforms to NAS 907 Type J standard

Compatibility

Designed as an OEM-style extended-reach drill bit for use in standard drill chucks accepting a 0.073-inch straight cylindrical shank, compatible with hand drills, drill presses, and pneumatic drilling equipment used in aerospace and industrial maintenance applications.

Installation Notes

This bit is intended for use by machinists, aviation maintenance technicians, and industrial tradespeople familiar with metal drilling procedures. Secure the workpiece firmly before drilling and use appropriate cutting fluid or lubricant when working with hard metals to extend tool life and maintain hole accuracy. Always verify spindle speed is appropriate for the material and bit diameter before operation. Inspect the bit for wear or chipping before each use and replace if the cutting edges are degraded.