Hertel C.E07.03571 Aircraft Extension Drill Bit 9/64

Product Description

The HERTEL C.E07.03571 is a cobalt aircraft extension drill bit designed for drilling in tight or deep-reach applications where a standard-length bit cannot access the work area. Built from cobalt steel with a straw finish, this bit measures 9/64 inch (0.1406 inch decimal) in diameter and runs 12 inches in overall length. The 135-degree split point is self-centering, reducing the need for a center punch and minimizing walking on hard or curved surfaces. A web-thinned, tapered web construction lowers cutting resistance and improves chip evacuation. This bit suits licensed aircraft mechanics, machinists, and metalworking professionals who require extended reach with consistent dimensional accuracy.

This aircraft extension drill bit is intended for use in aerospace, structural, and precision metalworking environments where standard flute lengths and overall lengths are insufficient. The cobalt construction handles higher heat buildup associated with drilling hard alloys, stainless steel, and aircraft-grade aluminum. The 1.75-inch spiral flute length and straight cylindrical shank make it compatible with standard drill chucks and right-hand rotating spindles. General-purpose performance rating means it covers a wide range of production and maintenance drilling tasks in both shop and field settings.

Key Features

• Cobalt tool material withstands elevated cutting temperatures in hard metals and alloys
• 135-degree split point is self-centering and reduces drill walking on curved or hard surfaces
• 12-inch overall length provides extended reach for aircraft structural and deep-cavity drilling
• Web-thinned tapered web reduces thrust force and improves chip flow
• Straw finish indicates heat-treated cobalt for added hardness and wear resistance
• Meets NAS 907 standard for aircraft extension drill bits

Compatibility

Designed as an OEM-style replacement or direct-use aircraft extension drill bit for applications conforming to NAS 907 standards; fits standard straight-cylindrical drill chucks accepting a 9/64-inch shank diameter.

Installation Notes

Installation is performed by qualified machinists or aircraft maintenance technicians holding appropriate certifications. Secure the straight cylindrical shank firmly in the drill chuck before operation and verify chuck runout is within acceptable tolerance for the application. Always wear appropriate eye protection and secure the workpiece before drilling. Follow applicable shop safety procedures and aerospace maintenance standards when working on certificated aircraft structure.