Hertel C.E05.0170 Aircraft Extension Drill Bit 51 Hss

Product Description

The HERTEL C.E05.0170 is a wire gauge size 51 aircraft extension drill bit designed for precision drilling in tight or hard-to-reach locations. Built from high-speed steel with an oxide finish, it features a 135-degree split point that is self-centering and reduces walking on entry. The extended 12-inch overall length makes it well-suited for drilling through structural assemblies, deep cavities, or stacked materials where a standard-length bit cannot reach. The spiral flute geometry and web-thinned, tapered web construction promote efficient chip evacuation and reduce cutting resistance. This bit is a general-purpose right-hand cutting tool intended for use by aircraft maintenance technicians, sheet metal workers, and structural fabricators.

This aircraft extension drill bit is used in aerospace maintenance, structural fabrication, and general metalworking applications where extended reach is required. The 0.0670-inch decimal diameter corresponds to wire gauge size 51 and is commonly applied when drilling rivet holes, pilot holes, or access holes through airframe structures, metal framing, and similar assemblies. The straight cylindrical shank seats in standard drill chucks without modification. Its general-purpose classification makes it suitable for a range of ferrous and non-ferrous materials at typical drilling speeds for high-speed steel tooling.

Key Features

• Wire gauge size 51 (0.0670 inches decimal) for precise hole sizing
• 135-degree split point with self-centering geometry reduces bit walk on entry
• 12-inch overall length provides extended reach into deep or obstructed work areas
• High-speed steel construction with oxide finish for general-purpose metal drilling
• Web-thinned, tapered web configuration promotes chip flow and reduces thrust
• Right-hand spiral flute with 2 flutes; straight cylindrical shank fits standard chucks

Compatibility

Designed as a general-purpose aircraft extension drill bit for use with standard keyed or keyless drill chucks accepting a 0.0670-inch straight cylindrical shank. Meets NAS 907 standards.

Installation Notes

This bit is installed and used by aircraft maintenance technicians, sheet metal mechanics, and structural fabricators following applicable maintenance manuals and safety procedures. Secure the workpiece firmly before drilling and verify chuck engagement before operation. Use appropriate cutting fluid or lubricant for the material being drilled to extend tool life. Inspect the bit for wear or damage before each use and replace if the point or cutting edges show deterioration.