Cleveland C13172 Aircraft Extension Drill Bit Size 50 Hss

Product Description

The CLEVELAND C13172 is an aircraft extension drill bit designed for precision drilling in tight-clearance and deep-reach applications. Built from high-speed steel with a bright, uncoated finish, it carries a wire gauge size of 50, which equals 0.0700 inches in decimal. The 135-degree split point is self-centering, reducing walking on entry and allowing drilling to start without a center punch in most applications. The extended 6-inch overall length makes it well suited for reaching into confined areas where a standard-length bit cannot. A licensed technician, machinist, or skilled tradesperson typically selects this bit when standard reach is insufficient for the job at hand.

This bit is intended for use in aerospace, aviation maintenance, and general metalworking applications where extended reach and precision are required. The NAS 907 Type B standard rating confirms it meets established aerospace tooling specifications. With a 1-inch spiral flute and right-hand cutting direction, it clears chips efficiently during through-hole and blind-hole drilling in sheet metal and structural members. It performs as a general-purpose tool across a range of base materials where high-speed steel provides adequate hardness and heat resistance.

Key Features

• Wire size 50 (0.0700 inches decimal) for precise small-diameter drilling
• 135-degree split point with self-centering geometry reduces walking and eliminates the need for a pilot hole in most setups
• 6-inch overall length provides extended reach into confined or deep-access areas
• High-speed steel construction offers reliable hardness for general-purpose metalworking
• Right-hand spiral flute with web-thinned, tapered web design improves chip evacuation
• Meets NAS 907 Type B aerospace tooling standard
• Diameter tolerance held to +0.0000 to -0.0005 inches for consistent, repeatable hole sizing

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907 Type B specifications, suitable for use with standard straight-shank drill chucks and compatible drilling equipment in aerospace and metalworking applications.

Installation Notes

This bit is installed and operated by machinists, aerospace maintenance technicians, and skilled tradespeople using compatible hand drills or drill presses fitted with a straight-shank chuck. Ensure the drill is powered off and the chuck is secure before inserting or removing the bit. Use appropriate cutting fluid or coolant when drilling hard metals to extend tool life and maintain hole quality. Inspect the bit for wear or chipping before each use, as a damaged cutting edge will affect hole diameter accuracy and surface finish.