Hertel C.E03.0635 Aircraft Drill Bit E 1/4 in Hss

Product Description

The HERTEL C.E03.0635 is an aircraft extension drill bit designed for deep-reach drilling applications where standard-length bits fall short. Built from high-speed steel with an oxide finish, this bit measures 6 inches in overall length and features a 135-degree split point that is self-centering, reducing the need for a center punch on most surfaces. The 2.75-inch spiral flute with a tapered web configuration and web-thinned geometry promotes efficient chip evacuation. Right-hand cutting direction and a straight cylindrical shank make it compatible with standard drill chucks. Machinists, aircraft maintenance technicians, and metalworkers rely on this bit for precision hole-making in confined or extended-reach setups.

This drill bit is suited for general-purpose drilling in metal, including aluminum, mild steel, and similar materials encountered in aerospace maintenance, fabrication shops, and machine shops. The aircraft extension length allows access to fastener locations and structural members that standard jobber-length bits cannot reach. Its 1/4-inch diameter corresponds to Letter E sizing and is commonly used when drilling for hardware that requires close-tolerance fits.

Key Features

• 135-degree split point is self-centering for accurate hole starts without center punching
• Web-thinned tapered web reduces thrust and improves cutting efficiency
• 2.75-inch spiral flute length promotes chip clearance during extended drilling
• Oxide finish provides mild corrosion resistance during storage and use
• 6-inch overall length provides extended reach for aircraft and deep-cavity applications
• Straight cylindrical 1/4-inch shank fits standard drill chucks and quick-change holders

Compatibility

Designed as a general-purpose aircraft extension drill bit for use in standard 3-jaw and keyless drill chucks accepting a 1/4-inch straight cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press or handheld drill operation. Secure the workpiece before drilling and ensure the chuck is fully tightened on the shank before operation. Use appropriate cutting fluid for ferrous metals to extend tool life and improve hole quality. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.