Hertel C.E03.0935 Aircraft Extension Drill Bit Letter U

Product Description

The HERTEL C.E03.0935 is an aircraft extension drill bit sized to Letter U (0.3680 inches decimal) with a 135-degree split point and a web-thinned, tapered web configuration. Built from high-speed steel with an oxide finish, it is designed for general-purpose drilling in aerospace maintenance, structural fabrication, and similar applications requiring extended reach. The 6-inch overall length and 3.625-inch spiral flute give technicians the clearance needed to reach fastener locations in tight or deep airframe structures. The self-centering split point reduces walking on entry, minimizing the need for a center punch.

This bit is suited for use in aerospace and industrial environments where standard-length drills cannot reach. Typical applications include drilling through stacked sheet metal, structural ribs, and bulkhead flanges in aircraft assembly or MRO work. The right-hand cutting direction and straight cylindrical shank make it compatible with standard drill chucks and right-angle drill attachments commonly used in airframe work. It meets NAS 907 standards, making it appropriate for controlled manufacturing and maintenance environments.

Key Features

• Letter U size — 0.3680 inch decimal diameter for precise fastener-hole sizing
• 135-degree split point with self-centering geometry reduces walking and exit burr
• Web-thinned tapered web lowers thrust requirements and improves chip evacuation
• High-speed steel construction with oxide finish for corrosion resistance and reduced friction
• 6-inch overall length with 3.625-inch spiral flute provides extended reach in confined areas
• Meets NAS 907 standard for aerospace drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard straight-cylindrical shank drill chucks and right-angle drill drivers used in aerospace and industrial drilling operations.

Installation Notes

Installation and use should be performed by qualified machinists, aerospace mechanics, or sheet metal technicians familiar with drill speed and feed selection for the material being drilled. Secure the workpiece and verify chuck tightness before operation. Use appropriate cutting fluid for the substrate to extend tool life and maintain hole quality. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.