Hertel C.E03.0909 Aircraft Extension Drill Bit Letter T

Product Description

The HERTEL C.E03.0909 is an aircraft extension drill bit designed for deep-reach drilling applications where a standard-length bit cannot access the work area. Built from high-speed steel with an oxide finish, this bit carries a Letter T diameter of 0.3580 inches and a 135-degree split point that is self-centering and reduces walking on entry. The two-flute spiral design with a web-thinned, tapered web configuration promotes efficient chip evacuation and reduces cutting resistance. At 6 inches overall length with a 3.5-inch flute length, it gives technicians the reach needed for structural and assembly drilling. Licensed tradespeople and aircraft maintenance professionals are the primary installers of this tool.

This bit is suited for general-purpose drilling in metalworking and aerospace MRO applications where extended reach is required. It is commonly used when drilling through structural panels, frames, or assemblies that restrict access to standard-length tooling. The right-hand cutting direction and straight cylindrical shank make it compatible with standard drill chucks and pneumatic drills used in aviation maintenance and metal fabrication shops. The oxide finish provides a base level of lubricity and corrosion resistance for shop and field use.

Key Features

• Letter T diameter (0.3580 inches) with straight cylindrical shank of matching diameter
• 135-degree split point with self-centering geometry reduces bit walking on entry
• Web-thinned, tapered web configuration lowers thrust and improves chip flow
• 3.5-inch flute length and 6-inch overall length provide extended reach
• Two-flute spiral design in high-speed steel for general-purpose metal drilling
• 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 requiring NAS 907-compliant tooling in aerospace MRO and metal fabrication environments.

Installation Notes

Installation and use of this bit should be performed by qualified machinists, aircraft maintenance technicians, or metal fabrication professionals. Secure the straight cylindrical shank firmly in a properly sized drill chuck before operation, and verify chuck runout is within acceptable tolerance to avoid bit deflection. Ensure appropriate cutting fluid or lubricant is applied when drilling hard metals to extend tool life. Follow applicable workplace safety standards and aviation maintenance manuals for drilling procedures on aircraft structures.