Hertel C.E05.0226 Aircraft Extension Drill Bit No. 43

Product Description

The HERTEL C.E05.0226 is a No. 43 aircraft extension drill bit engineered for deep-reach drilling applications where a standard-length bit cannot access the work surface. Built from high-speed steel with an oxide finish, it measures 12 inches in overall length and features a 1.25-inch spiral flute with a 135-degree split point. The self-centering split point reduces walking on initial contact, and web thinning lowers thrust requirements on entry. The straight cylindrical shank seats directly into standard drill chucks. This bit is installed by aircraft technicians, machinists, and maintenance professionals requiring extended reach in tight or deep-clearance drilling situations.

This drill bit is suited for general-purpose drilling in metal, composite, and similar materials where extended reach is required. The 12-inch overall length makes it well-suited for drilling through structural members, bulkheads, panels, or assemblies that would otherwise block a standard-length bit. It conforms to NAS 907 standards, making it appropriate for aerospace maintenance and overhaul work as well as general metalworking and fabrication environments.

Key Features

• No. 43 wire gauge size, 0.0890 inch decimal diameter
• 12-inch overall length for extended reach in deep or obstructed drilling locations
• 135-degree split point with self-centering geometry reduces bit walking on entry
• Web-thinned tapered web lowers cutting thrust and heat buildup
• Oxide finish on high-speed steel construction resists heat and light corrosion during service
• Right-hand spiral flute with two flutes for efficient chip evacuation
• Conforms to NAS 907 standard

Compatibility

Designed as a general-purpose aircraft extension drill bit for use in standard straight-shank drill chucks; compatible with any chuck accepting a 0.0890-inch straight cylindrical shank.

Installation Notes

Secure the straight cylindrical shank firmly in a drill chuck rated for the shank diameter before operation. Ensure workpiece is clamped or fixtured to prevent movement during drilling. Always wear appropriate eye protection and follow applicable shop safety procedures when operating drilling equipment. Inspect the bit for wear or damage before each use and discard any bit showing cracks, chipped flutes, or deformed geometry.