Hertel C.E07.0244 Aircraft Extension Drill Bit 41

Product Description

The HERTEL C.E07.0244 is a cobalt aircraft extension drill bit designed for drilling in hard and abrasive materials where standard-length bits fall short. Built to wire size 41 (0.0960 inches decimal), it features a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. The straw finish helps resist heat buildup during high-speed drilling operations. At 12 inches in overall length with a 1.375-inch spiral flute, this bit reaches into deep or recessed bores that shorter bits cannot access. It is a general-purpose cobalt tool suited for aerospace, structural, and precision fabrication work.

This aircraft extension bit is used in applications where reach is critical — deep-hole drilling, drilling through stacked material, or accessing fastener locations in airframe structures and fabricated assemblies. The right-hand cutting direction and straight cylindrical shank make it compatible with standard drill chucks. It meets NAS 907 standards, making it appropriate for aerospace and precision manufacturing environments. Typical users include aerospace maintenance technicians, structural fabricators, and precision machinists working with steel, stainless, or high-strength alloys.

Key Features

• Cobalt tool material provides heat and wear resistance for drilling hard metals and alloys
• 135-degree split point is self-centering and reduces thrust force required to start the hole
• 12-inch overall length extends reach into deep or confined drill locations
• Straw finish helps dissipate heat and extends tool life in demanding applications
• Web-thinned tapered web reduces cutting resistance and improves chip evacuation
• Meets NAS 907 standard for aerospace-grade tooling

Compatibility

Designed as a general-purpose aircraft extension drill bit for use in standard straight-shank drill chucks; suitable for aerospace maintenance, structural fabrication, and precision machining operations requiring extended reach in wire size 41 (0.0960 inches).

Installation Notes

Install in a standard drill chuck with the straight cylindrical shank fully seated and securely tightened before use. Secure the workpiece and ensure the drill press or hand drill is powered down before changing bits. Apply appropriate cutting fluid when drilling hardened steel or stainless alloys to manage heat and prolong tool life. Inspect the cutting edges before each use and replace the bit if chipping or heat discoloration beyond the straw finish is observed.