Chicago-latrobe 11041 Aircraft Extension Drill Bit No. 11

Product Description

The CHICAGO-LATROBE 11041 is a high speed steel aircraft extension drill bit designed for deep-reach drilling in metal and structural applications. Built to Series 906 specifications, it features a 135-degree split point that is self-centering and web-thinned, reducing walking and thrust on entry. The straight-cylindrical shank measures 0.191 inches in diameter, matching the wire gauge No. 11 drill size, and the spiral flute length runs 2.3125 inches. Right-hand cutting direction and a tapered web configuration suit general-purpose production and maintenance drilling tasks. Licensed HVAC, mechanical, and aircraft maintenance technicians working on sheet metal and structural assemblies will find this drill well suited for extended-reach access holes.

This drill bit is intended for applications where standard-length bits cannot reach, such as drilling through flanged assemblies, deep cavities, or obstructed sheet metal sections. The oxide finish provides baseline lubricity and corrosion resistance for dry or lightly lubricated cutting operations. With an overall length of 6 inches and a wire gauge No. 11 diameter of 0.191 inches, it fits common requirements in HVAC sheet metal fabrication, aircraft maintenance, and general metal fabrication shops.

Key Features

• 135-degree split point for self-centering entry with reduced thrust
• Web-thinned, tapered web construction minimizes walking on hard or thin material
• High speed steel construction for durability across steel, aluminum, and similar metals
• Oxide finish for basic lubricity and corrosion protection in dry-cut applications
• 6-inch overall length provides extended reach into deep or obstructed workpieces
• Meets NAS 907 Type B standards for aircraft and structural drilling applications

Compatibility

Designed as an OEM-style replacement or direct-use aircraft extension drill for applications requiring a wire gauge No. 11 (0.191 inch) diameter bit with a straight-cylindrical shank and 135-degree split point geometry, conforming to NAS 907 Type B.

Installation Notes

This drill bit is installed by machinists, aircraft maintenance technicians, and sheet metal tradespeople using standard drill chucks compatible with a straight-cylindrical shank. Always power down or de-energize all equipment in the work area before drilling near electrical components, and follow applicable shop safety and workholding procedures. Use appropriate cutting fluid or lubricant for the base material to extend bit life and maintain hole tolerance. Inspect the cutting edges before each use and replace if chipping or wear is observed to stay within the stated diameter tolerance of +0.0000 to -0.0007 inches.