Hertel C.E07.0913 Aircraft Extension Drill Bit 23/64 in

Product Description

The HERTEL C.E07.0913 is a cobalt aircraft extension drill bit designed for drilling in hard metals and aerospace-grade materials where standard-length bits cannot reach. Built from cobalt high-speed steel with a straw finish, it delivers heat resistance and edge retention in demanding applications. The 135-degree split point is self-centering and reduces walking on entry, which is critical when drilling on curved or irregular surfaces. At 12 inches overall length with a 3.5-inch spiral flute section, this bit is the go-to choice when access depth is the limiting factor. Machinists, aircraft maintenance technicians, and industrial fabricators are the primary users.

This bit fits applications requiring extended reach in tight or deep cavities, including airframe drilling, structural metalwork, and general industrial machining. It is suited for ferrous metals, stainless steel, titanium alloys, and other high-strength materials that generate heat and wear conventional HSS tooling quickly. The 23/64-inch diameter, which is 0.3594 inches decimal, is a common size for clearance holes and close-tolerance fastener drilling. The straight cylindrical shank is compatible with standard drill chucks and collet holders. NAS 907 compliance confirms it meets aerospace industry dimensional and performance standards.

Key Features

• Cobalt construction with straw finish for heat resistance and extended tool life in hard metals
• 135-degree split point with web thinning for self-centering entry and reduced thrust force
• 12-inch overall length provides extended reach into deep or obstructed work areas
• Right-hand spiral flute with 2-flute geometry promotes efficient chip evacuation
• Tapered web configuration adds rigidity while keeping the cutting tip aggressive
• NAS 907 compliant for use in aerospace and high-specification industrial environments

Compatibility

Designed as a standard aircraft extension drill bit for use in drill chucks and collet systems accepting a 23/64-inch straight cylindrical shank. Suitable for CNC drilling, hand-held pneumatic drills, and drill press setups in aerospace maintenance and industrial fabrication contexts.

Installation Notes

This bit is installed by machinists and aircraft maintenance technicians using standard drill chucks or collet holders rated for the shank diameter. Secure the shank fully in the chuck before operation to prevent runout and premature wear. Use cutting fluid or coolant when drilling hard alloys to manage heat buildup. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed, as a degraded cutting edge increases thrust force and can damage workpieces.