Hertel C.E03.0345 Aircraft Extension Drill Bit No. 29

Product Description

The HERTEL C.E03.0345 is a No. 29 wire-gauge aircraft extension drill bit designed for reaching into recessed or deep-set drilling locations that standard-length bits cannot access. Built from high-speed steel with an oxide finish, it measures 6 inches in overall length with a 1.75-inch spiral flute and a 0.1360-inch decimal diameter. The 135-degree split point is self-centering and web-thinned, reducing the thrust needed to start a hole and minimizing walking on hard or coated surfaces. Right-hand cutting with a two-flute spiral configuration, this bit is a general-purpose tool suited to aerospace, sheet metal, and structural drilling work where extended reach is required.

Aircraft extension drill bits like the C.E03.0345 are used in applications where standard jobber-length bits fall short. Typical install scenarios include drilling through aircraft skins, deep structural members, HVAC ductwork flanges, and sheet metal assemblies where a pilot hole or through-hole must be placed in a confined or recessed area. The straight cylindrical shank fits standard drill chucks without an adapter, making it compatible with handheld drills, drill presses, and right-angle drill attachments commonly used by aviation maintenance technicians, sheet metal workers, and mechanical contractors. It meets NAS 907 standards, confirming suitability for aerospace-grade drilling operations.

Key Features

• No. 29 wire gauge, 0.1360-inch decimal diameter for precision sizing in close-tolerance hole applications
• 135-degree split point is self-centering and reduces drill walking on curved or coated surfaces
• Web-thinned with tapered web configuration to lower thrust requirements and extend bit life
• 6-inch overall length provides extended reach into recessed or deep structural locations
• High-speed steel construction with oxide finish for general-purpose durability across metal substrates
• Meets NAS 907 aerospace standard

Compatibility

Designed as a general-purpose aircraft extension drill bit for use in standard drill chucks accepting a 0.1360-inch straight cylindrical shank, suitable for aerospace, sheet metal, and mechanical drilling applications conforming to NAS 907.

Installation Notes

Installation and use of this bit should be performed by qualified machinists, aviation maintenance technicians, or sheet metal workers familiar with proper drilling techniques for metal substrates. Secure the workpiece before drilling and use appropriate cutting fluid or lubricant to extend bit life and improve hole quality in steel or aluminum. Inspect the bit for chipping or wear before each use and replace if the cutting edges show damage. Follow applicable aerospace maintenance manuals or facility safety procedures when drilling on structural components.