Chicago-latrobe 11109 Aircraft Extension Drill 17/64 in

Product Description

The CHICAGO-LATROBE 11109 is a high speed steel aircraft extension drill bit designed for deep-reach drilling applications where a standard-length bit cannot access the work area. Built to Series 912 specifications and compliant with NAS 907 Type B standards, it features a 135-degree split point that is self-centering and web-thinned for reduced thrust and cleaner entry without a center punch. The 17/64 inch (0.2656 inch decimal) diameter and 12-inch overall length make it well-suited for structural and sheet metal drilling tasks. An oxide finish provides baseline corrosion and heat resistance during use. This bit is installed and used by maintenance mechanics, aviation technicians, and industrial tradespeople working on assemblies with limited access.

The 11109 is intended for general purpose drilling in ferrous and non-ferrous metals, composites, and structural materials commonly encountered in aerospace fabrication, MRO, and industrial maintenance. The 2-7/8 inch flute length handles chip evacuation over extended drilling passes, and the straight-cylindrical shank seats directly in standard drill chucks without an adapter. Right-hand cutting direction is standard for conventional drill press and hand-drill use.

Key Features

• 135-degree split point with self-centering geometry reduces walking and eliminates center-punch step
• Web-thinned, tapered web configuration lowers cutting resistance and thrust requirements
• 12-inch overall length provides extended reach into deep cavities or through structural assemblies
• High speed steel construction handles a wide range of metals and general-purpose materials
• Oxide finish offers heat and light corrosion resistance during drilling operations
• NAS 907 Type B compliant for use in aerospace and aviation maintenance applications

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a straight-cylindrical shank at 17/64 inch (0.2656 inch) diameter.

Installation Notes

Install into a keyed or keyless drill chuck and confirm the shank is fully seated and secured before operation. Power down and disconnect the drill before changing bits. Use appropriate cutting fluid for ferrous metals to extend tool life and maintain dimensional tolerance. The diameter tolerance of +0.0000 to -0.0010 inch should be verified against application requirements before drilling final-size holes in critical assemblies.