Hertel C.E05.0625 Aircraft Extension Drill Bit Letter D

Product Description

The HERTEL C.E05.0625 is an aircraft extension drill bit sized to Letter D (0.2460 inches decimal equivalent) with a 135-degree split point and a web-thinned, tapered web configuration. Built from high-speed steel with an oxide finish, this bit is designed for deep-reach drilling applications where standard-length bits fall short. The 12-inch overall length and 2.75-inch spiral flute give technicians the reach needed for airframe and structural panel work. The self-centering split point reduces walking on entry, making it suitable for precision hole location in metal substrates. Right-hand cutting direction with a straight cylindrical shank keeps compatibility broad across standard drill chucks.

This bit is intended for professional use in aerospace, aviation maintenance, and industrial fabrication environments where extended reach into confined or deep structural cavities is required. General-purpose tool performance makes it viable for mild steel, aluminum, and similar metals common in airframe and sheet-metal work. It conforms to NAS 907, the standard governing aircraft extension drills, making it appropriate for MRO and production drilling operations.

Key Features

• Letter D size with 0.2460-inch decimal equivalent diameter for precise hole sizing
• 135-degree split point with web thinning reduces thrust and minimizes drill walking on entry
• 12-inch overall length provides deep-reach access in confined structural assemblies
• High-speed steel construction with oxide finish for wear resistance in general-purpose metal drilling
• Straight cylindrical shank fits standard 3-jaw drill chucks without adapters
• Conforms to NAS 907 for use in certified aerospace maintenance and production environments

Compatibility

Designed as an OEM-style replacement and general-purpose aircraft extension drill bit suitable for standard 3-jaw drill chucks accepting a 0.2460-inch straight cylindrical shank. Meets NAS 907 requirements for aircraft extension drill bit applications.

Installation Notes

Installation and use of this bit should be performed by qualified machinists, aircraft mechanics, or sheet-metal technicians familiar with drill press or hand-drill operation. Secure the workpiece and verify chuck tightness before operation. Wear appropriate eye protection and ensure cutting speeds are appropriate for the material being drilled. Follow applicable shop procedures and aviation maintenance manual requirements when drilling structural components.