Hertel C.E07.0531 Aircraft Extension Drill Bit 12 in

Product Description

The HERTEL C.E07.0531 is a cobalt aircraft extension drill bit engineered for drilling in hard and abrasion-resistant materials where extended reach is required. Built to a 12-inch overall length with a 2.5-inch spiral flute, this bit handles deep-hole and hard-to-reach drilling applications common in aerospace, fabrication, and maintenance work. The 135-degree split point is self-centering and reduces the need for a center punch on flat or curved stock. A straw finish indicates the cobalt heat treatment used to improve hardness and wear resistance. The 0.2090-inch diameter corresponds to wire gauge size 4. Installed by machinists, aviation maintenance technicians, and metalworking professionals.

This bit is suited for drilling through stainless steel, high-strength steel, titanium, and other tough alloys where standard high-speed steel bits would wear prematurely. The extended 12-inch length makes it practical for structural airframe work, deep-cavity drilling, and through-panel applications in both aviation and general fabrication environments. The straight cylindrical shank accepts standard drill chucks without adapters, and right-hand cutting direction is compatible with conventional drill presses and hand drills. General-purpose performance rating covers a wide range of production and maintenance drilling tasks.

Key Features

• Cobalt tool material with straw finish for improved hardness and heat resistance
• 135-degree split point is self-centering and reduces walking on entry
• 12-inch overall length provides extended reach for deep or obstructed drilling locations
• 0.2090-inch diameter wire size 4 with tapered web configuration for reduced thrust
• Web-thinned geometry lowers cutting resistance in hard materials
• Meets NAS 907 standard for aircraft-grade drill bit performance

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard drill chucks accepting a 0.2090-inch straight cylindrical shank. Suitable for use in drill presses, hand drills, and pneumatic drill motors used in aviation maintenance and metal fabrication applications.

Installation Notes

Installation is performed by machinists or aviation maintenance technicians using standard drill chucks and appropriate cutting fluid for the base material. Secure the workpiece firmly before drilling to prevent movement during bit entry. Inspect the cutting edges before use and replace bits showing signs of chipping or heat discoloration beyond normal straw finish. Follow applicable workplace safety and aviation maintenance regulations when drilling structural components.