Hertel C.E04.0119 Aircraft Extension Drill Bit 3/64 in Hss

Product Description

The HERTEL C.E04.0119 is a 3/64 inch (0.0469 inch) diameter aircraft extension drill bit designed for drilling in hard-to-reach areas where a standard-length bit cannot access the workpoint. Built from high-speed steel with an oxide finish, it features a 135-degree split point and a spiral flute configuration for efficient chip evacuation. The 12-inch overall length makes it well suited for deep-reach applications in aerospace, sheet metal, and structural fabrication work. Installation and use are typical for machinists, toolmakers, and maintenance technicians working with metal substrates.

This bit is used in applications requiring extended reach into confined spaces or through deep structural members. The 3/4 inch flute length and right-hand cutting direction make it appropriate for general-purpose metal drilling in production and maintenance environments. The straight cylindrical shank seats in standard drill chucks without adapters. Typical use cases include sheet metal work, fuselage and airframe drilling, and structural steel maintenance where conventional bit length is insufficient.

Key Features

• 12-inch overall length provides extended reach into confined or deep workspaces
• 135-degree point angle with web-thinned, tapered web geometry reduces entry force and walking
• High-speed steel construction handles ferrous and non-ferrous metal drilling at general-purpose speeds
• Oxide finish provides mild lubricity and corrosion resistance during use
• Two-flute spiral design promotes chip clearance in deep-hole drilling
• Straight cylindrical shank fits standard drill chucks without a reducer or adapter

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 3/64 inch straight cylindrical shank.

Installation Notes

This drill bit is installed and operated by machinists, toolmakers, and maintenance technicians using standard handheld or bench-mounted drills. Secure the straight shank fully in the chuck jaws and verify concentricity before beginning a cut. Apply appropriate cutting fluid for the workpiece material to extend tool life and reduce heat buildup. Inspect the cutting edges before each use and discard bits showing chipping or excessive wear to avoid workpiece damage.