Chicago-latrobe 11090 Aircraft Extension Drill Bit Wire 60

Product Description

The CHICAGO-LATROBE 11090 is a Series 906 aircraft extension drill bit designed for precision drilling in tight-clearance and extended-reach applications. Built from high-speed steel with an oxide finish, it carries a wire gauge size of 60, which corresponds to a decimal diameter of 0.0400 inches. The straight-cylindrical shank measures 0.0980 inches in diameter, and the spiral flute length is 0.6875 inches. The 135-degree split point with web thinning promotes accurate hole entry and reduces walking on hard or layered materials. This bit is a general-purpose tool suited for use by aviation maintenance technicians, machinists, and precision tradespeople working with thin-gauge metals, composites, and tight-tolerance assemblies.

The 11090 is rated to NAS 907 Type B standards, making it appropriate for aerospace and aircraft maintenance environments where controlled hole geometry is critical. The 6-inch overall length provides the extended reach needed when drilling through structural members, panels, or stacked materials where a standard-length bit cannot access the work area. Right-hand cutting direction is standard for conventional drill press and hand-drill operation. General-purpose performance rating makes this bit suitable for a range of metals encountered in aviation and precision fabrication work.

Key Features

• Wire size 60 with a decimal diameter of 0.0400 inches for tight-tolerance precision work
• 135-degree split point with web thinning for accurate, self-starting hole entry
• High-speed steel construction with oxide finish for wear resistance in metal drilling
• 6-inch overall length for extended-reach drilling in confined or deep-access areas
• NAS 907 Type B rated for aerospace and aircraft maintenance applications
• Tapered web configuration with 2-flute spiral design for efficient chip evacuation

Compatibility

Designed as an OEM-style replacement and standard tooling option for aircraft maintenance, precision machining, and fabrication operations requiring wire-gauge drill bits conforming to NAS 907 Type B specifications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists, aviation maintenance technicians, or tradespeople familiar with small-diameter precision drilling. Secure the straight-cylindrical shank firmly in a compatible drill chuck rated for the shank diameter before operation. Use appropriate cutting fluid or lubrication when drilling hard metals to extend bit life and maintain hole tolerance. Inspect the cutting edges before each use — small-diameter bits at this size are susceptible to breakage if side-loaded or run at incorrect speeds.