Chicago-latrobe 11040 Aircraft Extension Drill Bit Wire 10

Product Description

The CHICAGO-LATROBE 11040 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 135-degree split point that self-centers on entry, reducing walking and the need for a center punch. The wire size 10 diameter measures 0.1935 inches, and the overall length of 6 inches with a 2.4375-inch spiral flute gives technicians extended reach into tight or recessed locations. It meets NAS 907 Type B standards, making it appropriate for aerospace and precision metalworking environments. The straight cylindrical shank fits standard drill chucks without adapters.

This drill bit is suited for aerospace maintenance, aircraft assembly, and general metalworking tasks that require extended reach. The spiral flute geometry promotes chip evacuation during through-hole drilling in steel, aluminum, and similar materials. The web-thinned, tapered web configuration reduces thrust force at the cutting tip, which is useful when drilling thinner-gauge sheet metal or layered assemblies common in aviation and industrial fabrication. It is a general-purpose tool intended for use by machinists, aviation maintenance technicians, and metalworking professionals who need reliable, repeatable hole quality in production or field-service settings.

Key Features

• 135-degree split point self-centers on contact, reducing bit walking on curved or angled surfaces
• High-speed steel construction with oxide finish for heat resistance and corrosion protection during dry or light-lubricated drilling
• 6-inch overall length with 2.4375-inch flute provides extended reach into deep or obstructed work areas
• Web-thinned, tapered web lowers cutting thrust and improves chip clearance
• Meets NAS 907 Type B standard for aircraft-grade drill bit performance
• Straight cylindrical shank fits standard drill chucks; right-hand cutting direction

Compatibility

Designed as an OEM-style replacement or direct substitute for wire size 10 aircraft extension drill bits meeting NAS 907 Type B specifications in standard straight-shank drill chucks used in aerospace maintenance and general metalworking applications.

Installation Notes

Installation is performed by machinists or aviation maintenance technicians using a standard handheld or bench drill with a compatible chuck. Ensure the workpiece is securely clamped and the drill is set to an appropriate speed for the material being drilled; higher speeds generally suit aluminum while lower speeds suit hardened steel. Apply cutting fluid when drilling ferrous materials to extend tool life and improve hole finish. Inspect the bit for chipping or wear before each use, as a damaged split point will compromise self-centering performance and hole accuracy.