Chicago-latrobe 11072 No 42 Aircraft Extension Drill Bit Hss

Product Description

The CHICAGO-LATROBE 11072 is a high speed steel aircraft extension drill bit designed for precision drilling in metal and aerospace-grade applications. Built to Series 906 specifications and compliant with NAS 907 Type B standards, this bit features a 135-degree split point for self-centering entry without a center punch. The 0.0935-inch diameter matches wire gauge No. 42 with a tight tolerance of +0.0000 to -0.0005 inches. The oxide finish improves lubricity and reduces heat buildup during cutting. A 1.25-inch spiral flute length and extended overall length of 6 inches make this bit well-suited for reaching into deep or restricted drilling locations.

This drill bit is intended for general purpose drilling in ferrous and non-ferrous metals, composites, and similar hard materials. The extended length is particularly useful in airframe maintenance, sheet metal fabrication, and structural assembly work where standard-length bits cannot reach the work surface. The straight cylindrical shank seats securely in standard drill chucks and right-angle drill attachments commonly used in maintenance and fabrication shops. It is typically installed and operated by aircraft maintenance technicians, machinists, and sheet metal mechanics.

Key Features

• 135-degree split point with web thinning for self-centering starts and reduced thrust
• No. 42 wire size at 0.0935 inches diameter with precision tolerance of +0.0000 to -0.0005 inches
• 6-inch overall length provides extended reach for deep or obstructed work locations
• High speed steel construction for durability across a wide range of metal drilling applications
• Oxide finish reduces friction and extends bit life in general purpose use
• NAS 907 Type B compliant, suitable for aerospace and structural fabrication work

Compatibility

Designed as an OEM-style replacement and standard-duty drilling tool compatible with any drill chuck accepting a 0.0935-inch straight cylindrical shank, including corded and cordless drills and pneumatic right-angle drill motors used in sheet metal and aerospace maintenance applications.

Installation Notes

This bit is installed and used by machinists, aircraft maintenance technicians, and sheet metal mechanics. Secure the straight cylindrical shank fully into the chuck before use and verify runout with a dial indicator when tolerance-critical holes are required. Always wear eye protection and ensure the workpiece is firmly clamped before drilling. Cutting fluid or cutting oil is recommended when drilling hard ferrous metals to extend bit life and maintain hole-size accuracy.