Hertel C.E05.0675 Aircraft Extension Drill Bit 17/64 in

Product Description

The HERTEL C.E05.0675 is a high speed steel aircraft extension drill bit engineered for deep-reach drilling in metal fabrication, aerospace maintenance, and industrial applications. The bit measures 17/64 inch (0.2656 inch decimal) in diameter with a 12-inch overall length, making it well suited for drilling into recessed or hard-to-access areas where standard-length bits cannot reach. The 135-degree split point is self-centering, reducing the need for a center punch and minimizing walking on startup. An oxide finish provides a base level of surface hardness and lubricity. This bit is typically installed by machinists, aircraft maintenance technicians, and industrial tradespeople working with drill presses or hand-held power drills.

This aircraft extension drill bit is designed for general-purpose drilling in steel, aluminum, and similar metals where extended reach is required. The 12-inch length is particularly useful for drilling through structural panels, bulkheads, ductwork, or other assemblies with limited bit clearance. The straight cylindrical shank is compatible with standard drill chucks. Two right-hand spiral flutes clear chips efficiently across the 2-7/8-inch (2.875-inch) flute length. The tapered web and web-thinned geometry reduce cutting resistance and improve hole entry performance in production and repair environments.

Key Features

• 17/64 inch (0.2656 inch) diameter with 12-inch overall length for deep-reach access
• 135-degree split point is self-centering for accurate hole starts without a center punch
• High speed steel construction for durability in ferrous and non-ferrous metal drilling
• Oxide finish for added surface hardness and reduced friction
• Two right-hand spiral flutes with tapered, web-thinned geometry for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard drill chucks accepting a 17/64-inch straight cylindrical shank. Suitable for use in hand-held power drills and drill presses across metal fabrication and maintenance applications.

Installation Notes

This bit is installed by machinists, aircraft maintenance technicians, and industrial tradespeople. Secure the straight shank firmly in the chuck before operation and verify the drill is set to right-hand rotation. Use appropriate cutting fluid when drilling ferrous metals to prolong tool life and improve finish quality. Inspect the cutting edges for wear or chipping before each use and replace the bit if the split point shows signs of dulling.