Chicago-latrobe 11055 Aircraft Extension Drill Bit

Product Description

The CHICAGO-LATROBE 11055 is a high speed steel aircraft extension drill bit designed for precision drilling in metal fabrication, aerospace maintenance, and general mechanical work. Built to Series 906 specifications and conforming to NAS 907 Type B standards, this bit features a 135-degree split point that is self-centering and web-thinned for fast, accurate starts without a center punch. The 0.1495-inch diameter matches Wire Size 25, with a 6-inch overall length that gives reach into deeper or restricted workspaces. The oxide finish provides light corrosion resistance and reduces friction during cutting. Licensed trades and production shops rely on this bit for consistent, on-spec hole sizing.

This drill bit is suited for applications requiring extended reach beyond a standard jobber-length bit. Common uses include drilling through structural panels, sheet metal stacks, airframe components, and tight-clearance assemblies. The right-hand spiral flute and tapered web configuration promote efficient chip evacuation during through-hole operations. General-purpose high speed steel construction makes it compatible with a wide range of ferrous and non-ferrous base materials at standard drill press or hand-drill speeds.

Key Features

• 135-degree split point with web thinning for self-centering entry and reduced thrust
• Wire Size 25 diameter (0.1495 inches) held to a tight tolerance of +0.0000 to -0.0007 inches
• 6-inch overall length provides extended reach for restricted or deep-bore applications
• High speed steel construction for general-purpose use on ferrous and non-ferrous materials
• Oxide finish reduces friction and offers light corrosion protection
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to NAS 907 Type B standard for dimensional and performance consistency

Compatibility

Designed as a general-purpose replacement or production drill bit for applications requiring a Wire Size 25, 0.1495-inch diameter aircraft extension drill conforming to NAS 907 Type B specifications.

Installation Notes

Install in a standard drill press or portable drill with a chuck that accepts a straight-cylindrical shank. Secure the shank fully in the chuck before applying power and verify the bit runs true to minimize runout. Use appropriate cutting fluid or lubricant when drilling ferrous materials to extend bit life and maintain hole tolerances. Wear ANSI-rated eye protection and follow applicable shop safety protocols when operating rotary cutting tools.