Hertel C.E07.0279 Aircraft Extension Drill Bit No. 35

Product Description

The HERTEL C.E07.0279 is a cobalt aircraft extension drill bit designed for drilling in hard and tough materials where standard-length bits cannot reach. Built to a No. 35 wire gauge size (0.1100 inches decimal), it features a 135-degree split point that reduces walking and enables self-centering without a center punch. The straw finish cobalt construction resists heat buildup during extended drilling operations. With a 12-inch overall length and 1.5-inch spiral flute, this bit is suited to aerospace, fabrication, and maintenance applications where deep reach and precise entry are required. It meets NAS 907 standards and is installed by machinists, aircraft mechanics, and maintenance technicians.

This drill bit is sized for applications requiring a No. 35 wire gauge hole in ferrous metals, stainless steel, and high-temperature alloys. The extended 12-inch overall length is specifically intended for drilling through structural members, panels, or assemblies where a standard-length bit cannot access the work area. The right-hand spiral flute with web-thinned, tapered web configuration promotes efficient chip evacuation in deep-hole drilling scenarios common in aircraft and industrial maintenance work.

Key Features

• No. 35 wire gauge size — 0.1100 inches decimal diameter
• 135-degree split point with self-centering geometry reduces bit walking
• Cobalt tool material with straw finish for heat resistance in hard materials
• 12-inch overall length for extended reach in deep or confined drilling locations
• Web-thinned tapered web for reduced thrust and improved chip flow
• Meets NAS 907 standard for aircraft-grade tooling

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard straight-shank drill chucks sized for 0.1100-inch shank diameters.

Installation Notes

This bit is intended for use by qualified machinists, aircraft mechanics, or maintenance technicians operating hand-held or fixed drilling equipment. Secure the workpiece before drilling and confirm the drill chuck is properly tightened on the straight-cylindrical shank before operation. Use appropriate cutting fluid when drilling hard alloys or stainless steel to extend tool life and manage heat. Follow applicable workplace safety standards and equipment manufacturer guidelines during use.