Hertel C.E05.0280 Aircraft Extension Drill Bit No. 35

Product Description

The HERTEL C.E05.0280 is a No. 35 wire-size aircraft extension drill bit engineered for reaching fastener locations in deep or obstructed cavities common in aerospace, structural, and sheet-metal work. Built from high-speed steel with an oxide finish, it features a 135-degree split point that is self-centering and web-thinned to reduce thrust and minimize walking on entry. The straight cylindrical shank measures 0.1100 inches in diameter, matching the 0.1100-inch cutting diameter. At 12 inches overall length, this bit provides the reach required for extended-access drilling applications where standard-length bits cannot reach.

This aircraft extension drill bit is suited for drilling in aluminum, mild steel, and composite materials encountered in aviation maintenance, structural fabrication, and general metalworking. The 12-inch overall length makes it practical for drilling through aircraft skin assemblies, deep structural members, and fixtures where clearance is limited. The right-hand spiral flute with a 1.5-inch flute length evacuates chips efficiently during through-hole drilling in thin-to-medium-thickness materials. It meets NAS 907 standards, making it appropriate for aerospace maintenance environments.

Key Features

• 135-degree split point with self-centering geometry reduces walking and improves hole location accuracy
• Web-thinned, tapered web configuration lowers cutting thrust for hand-drill and air-drill use
• 12-inch overall length provides extended reach into deep or restricted access areas
• High-speed steel construction with oxide finish for general-purpose drilling in metals and composites
• Straight cylindrical shank at 0.1100 inches fits standard drill chucks without adapters
• Meets NAS 907 standard for aerospace-grade drill bit performance

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit compatible with standard straight-shank drill chucks used in portable electric, pneumatic, and bench-mount drilling equipment.

Installation Notes

Installation is performed by licensed aircraft mechanics, sheet-metal technicians, or qualified machinists following applicable maintenance and fabrication procedures. Ensure the workpiece is securely clamped and the drill is properly aligned before starting. Use appropriate cutting fluid for the material being drilled to extend bit life and improve hole quality. Inspect the cutting edges before each use and replace the bit if chipping or wear is observed.