Precision Twist Drill 5996014 Cobalt Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 5996014 is a high-performance cobalt aircraft extension drill bit designed for demanding drilling applications in hard and tough materials. Built to Series CO501-6 specifications, this bit measures 0.1495 inches in diameter (Wire Size 25) with a 6-inch overall length that provides extended reach in confined or deep-hole applications. The 135-degree split point is self-centering and web-thinned, reducing walking on entry and lowering thrust requirements. A straw finish indicates the cobalt heat treatment applied to the tool steel, contributing to heat resistance at elevated cutting speeds. Licensed trades and aerospace maintenance personnel are the primary installers of this tool.

This drill bit is suited for use in aerospace, industrial maintenance, and structural fabrication environments where extended reach is required and material hardness demands a cobalt-grade cutting tool. The CO501-6 series is commonly applied when drilling high-strength alloys, stainless steel, titanium, and hardened steels where standard high-speed steel bits would overheat or wear prematurely. It is sold individually and used in handheld or drill-press setups where a straight-cylindrical shank is compatible with the chuck.

Key Features

• Cobalt tool material for heat resistance and extended tool life in hard metals
• 135-degree split point with web-thinning for self-centering entry and reduced thrust
• 6-inch overall length provides extended reach in deep or obstructed drilling scenarios
• Straw finish indicates cobalt heat treatment applied during manufacturing
• Straight-cylindrical shank at 0.1495 inches diameter fits standard drill chucks
• Right-hand spiral flute with tapered web configuration for efficient chip evacuation
• Meets NAS 907 Type J standard for aircraft-quality drilling applications

Compatibility

Designed as a Series CO501-6 aircraft extension drill bit compatible with standard drill chucks accepting a 0.1495-inch straight-cylindrical shank. Meets NAS 907 Type J standards for aerospace and high-performance drilling applications.

Installation Notes

This drill bit is installed and operated by machinists, aircraft maintenance technicians, and metalworkers using handheld power drills or drill presses equipped with a compatible chuck. Secure the shank fully in the chuck before operation and verify chuck tightness to prevent slippage. Use appropriate cutting fluid or coolant when drilling hard alloys to preserve tool life. Follow applicable workplace safety standards and wear eye protection during all drilling operations.