Hertel C.E03.0199 Aircraft Extension Drill Bit 47 Hss

Product Description

The HERTEL C.E03.0199 is an aircraft extension drill bit designed for precision drilling in tight or deep access areas. Built from high-speed steel with an oxide finish, it is engineered for general-purpose metal drilling applications where standard-length bits cannot reach. The bit carries a wire gauge size of 47, equivalent to 0.0785 inches in decimal. Its 135-degree split point is self-centering and web-thinned, reducing the force needed to start a hole and improving accuracy on curved or angled surfaces. At 6 inches overall length with a 1-inch spiral flute, this bit is suited for aerospace-style and production drilling tasks performed by machinists and maintenance technicians.

This bit is used in applications where extended reach is required, such as drilling through structural assemblies, sheet metal stacks, or panels in aviation maintenance and general industrial fabrication. The straight cylindrical shank fits standard drill chucks without modification. Its right-hand cutting direction and two-flute spiral geometry provide efficient chip evacuation during through-hole drilling. General-purpose tool performance makes it appropriate for a wide range of ferrous and non-ferrous materials encountered in trade and industrial environments.

Key Features

• Wire size 47 (0.0785 inches decimal) for precise small-diameter hole sizing
• 135-degree split point with self-centering geometry reduces walking on entry
• Web-thinned, tapered web configuration lowers thrust requirements
• 6-inch overall length provides extended reach into confined or deep assemblies
• High-speed steel construction with oxide finish for corrosion resistance and heat dissipation
• Meets NAS 907 standard for aircraft extension drill bits

Compatibility

Designed as an OEM-style replacement and general-use aircraft extension drill bit compatible with standard drill chucks accepting a 0.0785-inch straight cylindrical shank.

Installation Notes

This bit is typically installed and operated by machinists, aerospace maintenance technicians, or industrial maintenance professionals. Secure the straight shank firmly in a keyed or keyless drill chuck before use and verify chuck runout is within acceptable tolerance for small-diameter bits. Use appropriate cutting fluid for the material being drilled to extend tool life and maintain hole quality. Inspect the bit for chipping or wear before each use, as small-diameter high-speed steel bits are susceptible to breakage under excessive feed pressure or lateral load.