Hertel C.E06.0522 Aircraft Extension Drill Bit No. 5

Product Description

The HERTEL C.E06.0522 is a cobalt aircraft extension drill bit designed for drilling in hard and abrasive materials where standard high-speed steel bits fall short. Built to wire gauge No. 5 sizing (0.2055 inches decimal), it features a 135-degree split point that self-centers on contact and eliminates the need for a center punch in most applications. The straw finish indicates heat-treated cobalt construction suited for production drilling in stainless steel, hardened alloys, and aerospace-grade materials. Licensed HVAC techs, machinists, and aerospace maintenance professionals are the primary installers of this tool.

This bit is engineered for aircraft and aerospace maintenance applications where extended reach is required beyond what a standard-length bit provides. The 6-inch overall length with a 2.5-inch spiral flute section allows access to recessed or obstructed hole locations common in airframe and structural assembly work. Its general-purpose classification also makes it appropriate for industrial fabrication, sheet metal, and heavy equipment repair where cobalt hardness is necessary for consistent, repeatable hole geometry.

Key Features

• Cobalt tool material with straw finish for heat resistance and hardness retention in demanding materials
• 135-degree split point with web thinning for self-centering entry and reduced thrust force
• No. 5 wire size — 0.2055 inches decimal diameter — with straight-cylindrical shank of matching diameter
• 6-inch overall length with 2.5-inch spiral flute for extended reach into confined or recessed locations
• Right-hand cutting direction with 2-flute spiral configuration for efficient chip evacuation
• Tapered web configuration meets NAS 907 standards for aircraft-grade drilling applications

Compatibility

Designed as an OEM-style aircraft extension drill bit conforming to NAS 907 standards, suitable for use in standard drill chucks and drill motors accepting a 0.2055-inch straight-cylindrical shank.

Installation Notes

This bit is intended for use by machinists, aircraft maintenance technicians, or qualified trade professionals operating drill presses, hand drills, or pneumatic drill motors. Secure the straight-cylindrical shank firmly in the chuck before operation and verify chuck capacity accommodates 0.2055-inch shank diameter. Always use appropriate cutting fluid or coolant when drilling hardened alloys or stainless steel to preserve cutting edge life. Follow applicable workplace safety standards and applicable aviation maintenance regulations when performing structural drilling on aircraft components.