Hertel C.E05.0244 Aircraft Extension Drill Bit No. 41

Product Description

The HERTEL C.E05.0244 is a No. 41 wire-size aircraft extension drill bit designed for deep-reach drilling applications where standard-length bits cannot access the worksite. Built from high-speed steel with an oxide finish, it features a 135-degree split point that is self-centering and web-thinned for reduced thrust and cleaner entry. The 12-inch overall length combined with a 1.375-inch spiral flute provides the reach needed for structural and airframe drilling. Right-hand cutting direction and a straight cylindrical shank make it compatible with standard drill chucks. This bit is suited for metalworking professionals, aerospace MRO technicians, and machinists who work within confined or extended-reach bores.

The C.E05.0244 is built for general-purpose drilling in metal, including aluminum, mild steel, and similar materials encountered in aircraft and structural fabrication. Its 12-inch body length is specifically useful when drilling through deep structural members, stacked panels, or tight access points where a jobber-length bit falls short. The two-flute spiral configuration clears chips efficiently during extended drilling passes. This bit conforms to NAS 907 standards, making it appropriate for aerospace and military maintenance environments where dimensional and performance standards are required.

Key Features

• No. 41 wire size (0.0960 inches decimal) for precise, tight-tolerance hole sizing
• 135-degree split point with web thinning for self-centering entry and reduced feed pressure
• 12-inch overall length for extended reach into deep or confined workspaces
• High-speed steel construction with oxide finish for wear resistance in general-purpose metalworking
• Two-flute spiral design with tapered web configuration for efficient chip evacuation
• Meets NAS 907 standard for aerospace and structural drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907 standards, suitable for use in standard drill chucks accepting a 0.0960-inch straight cylindrical shank.

Installation Notes

This bit is typically installed and operated by machinists, aerospace MRO technicians, and metalworking professionals using standard drill presses, hand drills, or pneumatic drilling equipment. Secure the straight cylindrical shank firmly in a compatible chuck before operation to prevent slippage during extended-reach drilling. Always wear appropriate eye and hand protection when drilling metal. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.