Hertel C.E05.0480 Aircraft Extension Drill Bit No. 12

Product Description

The HERTEL C.E05.0480 is a No. 12 wire-size aircraft extension drill bit engineered for deep-reach drilling applications where a standard-length bit cannot access the workpiece. Built from high-speed steel with an oxide finish, it measures 12 inches in overall length and features a 135-degree split point that is self-centering and web-thinned for reduced thrust and cleaner entry. The spiral flute design evacuates chips efficiently during extended drilling cycles. With a straight cylindrical shank at 0.1890 inches in diameter and two flutes with a tapered web configuration, this bit is suited for general-purpose metalworking and aerospace-adjacent fabrication tasks performed by machinists and maintenance technicians.

This aircraft extension drill bit is designed for reaching into cavities, through structural members, or along channels where conventional drill bit lengths are insufficient. It is commonly used in aircraft maintenance, sheet metal fabrication, and industrial maintenance environments. The 12-inch overall length provides the reach needed for deep-hole drilling in aluminum, mild steel, and similar materials. It conforms to NAS 907 standards, making it appropriate for applications where aerospace-grade tooling requirements apply.

Key Features

• No. 12 wire size with 0.1890-inch decimal diameter for precision sizing
• 135-degree split point with self-centering geometry reduces walking and minimizes required thrust
• Web-thinned, tapered web construction improves cutting efficiency and lowers drill pressure
• 12-inch overall length provides extended reach for deep or obstructed drilling locations
• High-speed steel construction with oxide finish for heat resistance and corrosion protection
• Conforms to NAS 907 standards for aerospace and industrial tooling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit for use in standard drill chucks accepting a 0.1890-inch straight cylindrical shank, compatible with hand drills, drill presses, and right-angle drilling attachments used in metalworking and aircraft maintenance operations.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill equipment. Secure the straight cylindrical shank firmly in the chuck before operation and verify the workpiece is clamped or fixtured to prevent movement. Apply cutting fluid appropriate to the workpiece material to extend tool life and improve hole quality. Inspect the cutting edges before each use and replace the bit if chipping or dullness is observed.