Hertel C.E07.0480 Aircraft Extension Drill Bit 12

Product Description

The HERTEL C.E07.0480 is a wire gauge size 12 aircraft extension drill bit engineered for demanding drilling applications in tight or deep-access situations. Built from cobalt high-speed steel with a straw finish, this bit delivers elevated heat resistance and extended tool life when cutting through hard metals and alloys. The 135-degree split point is self-centering, eliminating the need for a center punch and reducing walking on entry. With a total length of 12 inches and a spiral flute configuration, it channels chips out efficiently during extended-reach drilling. Licensed machinists, aircraft maintenance technicians, and metalworking tradespeople are the primary installers of this bit.

This aircraft extension drill bit is suited for production and maintenance drilling in aerospace, industrial, and structural metalworking environments where standard-length bits cannot reach the work surface. The 12-inch overall length provides clearance for drilling through deep assemblies, flanged structures, or obstructed panels. The straight cylindrical shank fits standard drill chucks without an adapter. Its general-purpose performance rating and NAS 907 compliance make it a dependable choice across a range of ferrous and non-ferrous metals.

Key Features

• Cobalt construction with straw finish for improved heat resistance and tool longevity
• 135-degree split point with self-centering geometry reduces walking on hard surfaces
• 12-inch overall length for extended-reach and deep-access drilling
• 2-5/16-inch spiral flute for efficient chip evacuation
• Web-thinned, tapered web configuration reduces thrust and improves cutting efficiency
• Meets NAS 907 standard for aircraft extension drill bits

Compatibility

Designed as an OEM-style aircraft extension drill bit in wire gauge size 12 (0.1890 inches decimal equivalent) for use with standard drill chucks accepting a 0.1890-inch straight cylindrical shank.

Installation Notes

Installation is performed by machinists, aircraft maintenance technicians, or qualified metalworkers using a drill press, hand drill, or pneumatic drill with a properly sized chuck. Secure the workpiece before drilling and confirm chuck tightness to prevent slippage during operation. Cutting fluid or coolant is recommended when drilling hard metals to preserve the cutting edge and manage heat buildup. Inspect the bit for wear or chipping before each use and replace if the cutting edges are degraded.