Hertel C.E03.1151 Aircraft Extension Drill Bit 29/64 in Hss

Product Description

The HERTEL C.E03.1151 is an aircraft extension drill bit engineered for reaching into deep or confined areas that standard-length bits cannot access. Built from high-speed steel with an oxide finish, it measures 29/64 inch (0.4531 inch) in diameter and carries a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. The 4-3/16 inch spiral flute length and 6-inch overall length make it well suited for extended-reach applications in aerospace, HVAC sheet metal, structural framing, and general metalworking. Two right-hand spiral flutes clear chips efficiently during drilling.

This bit is intended for general-purpose drilling in metal, sheet stock, and light structural materials where extra reach is required. Typical applications include drilling through HVAC cabinet walls, aircraft skins, deep weldments, and structural steel or aluminum assemblies where a standard jobber-length bit falls short. It is commonly used by HVAC fabricators, sheet metal workers, maintenance machinists, and aerospace-rated technicians working in tight or deep access situations.

Key Features

• 135-degree split point self-centers on contact, minimizing bit walking without a center punch
• Web-thinned, tapered web construction reduces thrust force and improves chip evacuation
• High-speed steel construction handles the heat and friction of metal drilling at standard feed rates
• Oxide finish provides mild corrosion resistance and reduces surface friction during cutting
• 6-inch overall length with a 4-3/16 inch flute gives extended reach into deep or obstructed work areas
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose aircraft extension drill bit fitting any standard drill chuck that accepts a 29/64 inch straight cylindrical shank.

Installation Notes

This bit is installed and operated by machinists, sheet metal workers, and HVAC fabricators using a standard drill press or hand drill with an appropriately sized chuck. Secure the workpiece firmly before drilling and verify the chuck is fully tightened on the straight shank. Use appropriate cutting fluid when drilling ferrous metals to prolong bit life and manage heat. Replace the bit if the cutting edges show visible wear, as a dull bit increases thrust force and risks workpiece damage.