Hertel C.E05.0391 Aircraft Extension Drill Bit 23

Product Description

The HERTEL C.E05.0391 is an aircraft extension drill bit engineered for reaching into deep or restricted workspaces that standard-length bits cannot access. Built from high-speed steel with an oxide finish, this bit measures 12 inches in overall length and is designed for right-hand cutting. The 135-degree split point with web thinning enables self-centering on entry, reducing the need for a center punch and minimizing walking on curved or angled surfaces. With a 2-inch spiral flute and a 0.154-inch diameter matched to wire gauge size 23, it delivers reliable chip evacuation during extended-reach drilling operations.

This aircraft extension bit is intended for metalworking applications where additional reach is required, such as drilling through structural members, deep assemblies, or stacked materials common in aerospace, HVAC installation, and sheet metal fabrication. The straight cylindrical shank accepts standard drill chucks, making it compatible with handheld power drills and drill presses. General-purpose tool performance makes it suited for ferrous and non-ferrous metals. Installation and fabrication professionals working in tight bays or behind panels will find this bit particularly useful where a standard jobber-length bit falls short.

Key Features

• 135-degree split point with web thinning for self-centering and reduced thrust on entry
• 12-inch overall length provides extended reach into deep or obstructed work areas
• High-speed steel construction with oxide finish for lubricity and corrosion resistance
• Wire gauge size 23 with 0.154-inch diameter and matching 0.154-inch straight cylindrical shank
• 2-inch spiral flute with tapered web configuration for efficient chip clearance
• Right-hand cutting, 2-flute design conforming to NAS 907 standard

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit for use in standard drill chucks accepting a 0.154-inch straight cylindrical shank, compatible with handheld power drills and benchtop drill presses used in metal fabrication and structural drilling applications.

Installation Notes

This bit is installed by qualified machinists, sheet metal workers, HVAC technicians, and fabricators using standard drill equipment. Secure the straight shank firmly in the chuck before use and verify chuck capacity accommodates a 0.154-inch shank. Wear appropriate PPE including eye protection when drilling metal. Apply cutting fluid or lubricant as appropriate for the workpiece material to extend tool life and maintain cut quality.