Chicago-latrobe 11165 Aircraft Extension Drill Bit

Product Description

The CHICAGO-LATROBE 11165 is a wire gauge size 41 aircraft extension drill bit engineered for deep-reach drilling in metal and structural applications. Built from high speed steel with an oxide finish, this bit features a 135-degree split point that is self-centering and web-thinned for reduced thrust and cleaner entry. The straight-cylindrical shank measures 0.0935 inches in diameter, and the two-flute spiral design produces efficient chip evacuation. The 1.375-inch flute length and 12-inch overall length make it well suited for accessing fastener locations in tight or recessed areas. This is a general-purpose, right-hand cutting bit conforming to NAS 907 Type B standards.

The 11165 is used in aviation, aerospace, and industrial maintenance applications where standard-length drill bits cannot reach. The extended 12-inch overall length allows technicians to drill through structural panels, frames, and assemblies without disassembly. It is a common choice for aircraft mechanics, MRO shops, and industrial maintenance teams working on riveted or bolted structures. The 135-degree split point geometry reduces walking on hard surfaces, making it effective on steel, aluminum, and similar materials typical in these environments.

Key Features

• Wire size 41 with 0.0960 inch decimal diameter and tight tolerance of +0.0000 to -0.0005 inches
• 135-degree split point with self-centering geometry reduces bit walking on entry
• Web-thinned, tapered web configuration lowers cutting resistance and thrust force
• 12-inch overall length provides extended reach for deep or obstructed drilling locations
• High speed steel construction with oxide finish for general-purpose metal drilling
• Conforms to NAS 907 Type B standards for aircraft and industrial use

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit conforming to NAS 907 Type B, suitable for use in standard drill chucks accepting a 0.0935-inch straight-cylindrical shank.

Installation Notes

Installation is performed by machinists, aircraft mechanics, or industrial maintenance technicians using a hand drill, drill press, or pneumatic drill with a compatible chuck. Secure the workpiece and verify chuck grip on the straight shank before operation. Use appropriate cutting fluid for ferrous materials to extend bit life and maintain dimensional tolerance. Inspect the cutting edges before each use and replace if chipping or wear is observed.