Precision Twist Drill 6001369 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001369 is a 29/64-inch diameter aircraft extension drill bit engineered for deep-reach drilling in aerospace and structural metalworking applications. Built from high speed steel with an oxide finish, it features a 135-degree split point that is self-centering and web-thinned for clean entry without a center punch. The flute length measures 4.1875 inches with a 4xD flute-to-diameter ratio, and the overall length reaches 12 inches, giving technicians extended reach into confined or deep work areas. Two spiral flutes cut in a right-hand direction, evacuating chips efficiently during through-hole operations.

This drill bit is suited for aircraft maintenance, structural fabrication, and heavy equipment repair where standard-length drill bits cannot reach the work surface. The straight-cylindrical shank is sized at 29/64 inch (0.4531 inch decimal), compatible with standard drill chucks used in both hand-held and drill-press setups. General-purpose tool performance makes it appropriate for use in aluminum, mild steel, and similar metals common in aircraft and industrial work. It is sold individually and is a single-piece package.

Key Features

• 135-degree split point is self-centering and reduces walking on entry without a pilot hole
• Web-thinned, tapered web construction reduces thrust and improves chip clearance
• 12-inch overall length provides extended reach into deep or obstructed work areas
• High speed steel construction withstands heat generated in continuous metal drilling
• Oxide finish provides mild corrosion resistance and reduces friction during cutting
• Conforms to NAS 907 Type B standards for aircraft-grade tooling

Compatibility

Designed as a general-purpose aircraft extension drill bit in the Series 500-12 line, conforming to NAS 907 Type B. Fits any standard drill chuck accepting a 29/64-inch (0.4531-inch) straight-cylindrical shank.

Installation Notes

This tool is installed and operated by machinists, aircraft maintenance technicians, and structural fabricators. Secure the straight shank firmly in a keyed or keyless chuck before use and verify chuck capacity matches the 29/64-inch shank diameter. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish. Always wear eye protection and follow applicable shop safety and aerospace maintenance manual procedures when drilling structural components.