Hertel C.E03.1230 Aircraft Extension Drill Bit 31/64 in

Product Description

The HERTEL C.E03.1230 is an aircraft extension drill bit engineered for deep-reach drilling applications where a standard-length bit cannot access the workpiece. Built from high-speed steel with an oxide finish, this bit measures 31/64 inch (0.4844 inch) in diameter and carries a 135-degree split point that self-centers on contact, reducing the need for a center punch on most materials. The two-flute spiral design and web-thinned, tapered web configuration reduce cutting resistance and help clear chips efficiently. At 6 inches overall length with a 4.375-inch flute length, it delivers the reach required for aircraft structure, sheet metal stacks, and other extended-access fabrication tasks.

This bit is suited for metalworking and fabrication environments where a standard jobber-length drill cannot reach the target bore location. Typical applications include aircraft airframe drilling, deep-cavity sheet metal work, structural fabrication, and maintenance repair operations on assemblies with limited tool clearance. The straight cylindrical shank seats directly into standard drill chucks without an adapter. Right-hand cutting direction makes it compatible with conventional corded and cordless drill drivers as well as drill presses. General-purpose tool performance classification makes it appropriate across a broad range of ferrous and non-ferrous materials.

Key Features

• 135-degree split point self-centers on contact, minimizing walk on flat and curved surfaces
• Web-thinned tapered web reduces thrust force and cutting resistance
• High-speed steel construction with oxide finish for corrosion resistance and lubricity
• Extended 6-inch overall length provides deep-reach access in confined or layered assemblies
• Two-flute spiral design promotes efficient chip evacuation during through-hole drilling
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or direct-fit option for aircraft extension drill bit applications requiring a 31/64 inch diameter, 135-degree split point, high-speed steel bit with a straight cylindrical shank and 6-inch overall length.

Installation Notes

Install and remove drill bits only with the drill or drill press fully powered off and unplugged or locked out per applicable OSHA lockout/tagout procedures. Secure the straight shank firmly in the chuck before applying power, and verify the chuck key is removed before starting the tool. Use cutting fluid appropriate to the workpiece material to extend bit life and maintain hole quality. Wear appropriate eye protection and secure the workpiece to prevent rotation during drilling.