Precision Twist Drill 5996037 Cobalt Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 5996037 is a cobalt aircraft extension drill bit designed for drilling in aerospace-grade and hard-to-reach applications. Built to Series CO501-6 specifications, it carries a wire size 3 designation with a decimal diameter of 0.2130 inches and an overall length of 6 inches. The 135-degree split point allows self-centering entry without a center punch, reducing walkout on curved or angled surfaces. A straw finish indicates cobalt content throughout the tool, improving heat resistance during high-speed or heavy-feed drilling. Licensed machinists, aircraft maintenance technicians, and industrial trade professionals are the primary installers of this bit.

This drill bit is suited for drilling hard metals, stainless steel, and alloys common in aerospace and industrial maintenance environments. The 6-inch overall length provides the extended reach needed to access recessed locations in aircraft structure, machinery frames, and deep-cavity assemblies. The spiral flute configuration and 2.5-inch flute length promote chip evacuation during through-hole and deep drilling operations. It is appropriate for use in both handheld pneumatic drills and drill press setups where extended reach is required.

Key Features

• Cobalt tool material with straw finish for improved heat and wear resistance in hard metals
• 135-degree split point with self-centering geometry reduces walkout without a center punch
• 6-inch overall length provides extended reach for deep-cavity and recessed drilling
• Straight cylindrical shank compatible with standard drill chucks
• Right-hand spiral flute promotes efficient chip evacuation
• Web-thinned tapered web construction reduces thrust required during entry
• Meets NAS 907 Type J standards for aerospace-grade tooling

Compatibility

Designed as an OEM-style replacement and general-purpose fit for standard straight-shank drill chucks used in pneumatic, electric, and drill press applications requiring an aircraft-length extension bit in wire size 3 (0.2130 inches diameter).

Installation Notes

Installation of this drill bit is performed by machinists, aircraft mechanics, and industrial maintenance technicians. Secure the straight cylindrical shank fully into the chuck before operation and verify chuck key is removed prior to powering the drill. Use appropriate cutting fluid when drilling stainless steel or hardened alloys to extend tool life and manage heat buildup. Follow applicable workplace safety standards and manufacturer feed-rate guidelines for cobalt tooling.