Hertel C.E05.0980 Aircraft Extension Drill Bit Letter W

Product Description

The HERTEL C.E05.0980 is an aircraft extension drill bit designed for deep-reach drilling applications where standard-length bits cannot access the workpoint. Sized at Letter W (0.386 decimal inch), it features a 135-degree split point that is self-centering and reduces walking on entry, eliminating the need for a center punch in most setups. The bit is manufactured from high-speed steel with an oxide finish that provides mild corrosion resistance and reduces friction during cutting. At 12 inches overall length with a 3.75-inch spiral flute, it is built for technicians and machinists who need consistent performance in tight or extended-reach bores on aircraft structures and assemblies.

This bit is suited for use in aerospace maintenance, airframe drilling, and structural fabrication where access depth is a limiting factor. The right-hand spiral flute and web-thinned, tapered web configuration improve chip evacuation in deep holes. General-purpose tool performance classification means it handles aluminum, mild steel, and composite materials common in aviation and precision fabrication environments. Licensed airframe mechanics, aerospace maintenance technicians, and precision machinists are the primary users. It meets NAS 907 standards, making it appropriate for regulated aerospace drilling operations.

Key Features

• Letter W size — 0.386 decimal inch diameter for precise fit to specification
• 135-degree split point with self-centering geometry reduces walk-off on entry
• Web-thinned, tapered web configuration improves chip flow in deep or blind holes
• 12-inch overall length provides extended reach for airframe and structural drilling
• High-speed steel construction with oxide finish for durability and friction reduction
• Meets NAS 907 standard for aerospace drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907, suitable for use in aerospace maintenance and precision machining applications requiring a Letter W diameter straight-shank bit at 12-inch extension length.

Installation Notes

Installation and use should be performed by qualified airframe mechanics, machinists, or maintenance technicians familiar with aerospace drilling procedures. Secure the workpiece fully before drilling and confirm the drill press or power tool chuck is properly tightened on the straight cylindrical shank before operation. Use appropriate cutting fluid or lubricant for the base material to extend bit life and maintain hole tolerance. Inspect the split point for wear or chipping before each use, as a damaged point on an extension bit can cause deflection in deep-reach applications.