Hertel C.E07.0579 Aircraft Extension Drill Bit No1 Cobalt

Product Description

The HERTEL C.E07.0579 is a No. 1 wire size aircraft extension drill bit engineered for drilling in tight clearance and extended-reach applications. Built from cobalt high-speed steel with a straw finish, it resists heat buildup during prolonged drilling cycles in hard or abrasive materials. The 135-degree split point is self-centering, eliminating the need for a center punch on most surfaces. At 12 inches overall length with a 2.625-inch spiral flute, this bit is sized for aerospace-style access drilling. It carries a 0.2280-inch decimal diameter and a straight cylindrical shank of matching diameter, making it compatible with standard drill chucks. Manufactured to NAS 907 standards.

This bit is intended for general-purpose drilling in metals, including stainless steel, titanium, and hardened alloys where extended reach is required. Typical applications include aircraft maintenance, structural fabrication, and production drilling where a standard-length bit cannot access the work area. The right-hand cutting direction and two-flute spiral geometry provide efficient chip evacuation in through-hole drilling. It is used by aviation maintenance technicians, metalworkers, and precision fabricators who need reliable performance over extended drilling cycles in hard-to-reach locations.

Key Features

• No. 1 wire size (0.2280 inch decimal diameter) for precise hole sizing
• Cobalt construction with straw finish for heat resistance in hard metals
• 135-degree split point with self-centering geometry reduces walking without center punch
• 12-inch overall length provides extended reach for aircraft and structural applications
• Web-thinned tapered web reduces thrust and improves cutting efficiency
• Meets NAS 907 standards for aerospace-grade drill bit performance

Compatibility

Designed as an OEM-style extended-reach drill bit suitable for use with standard straight-shank drill chucks and magnetic drill presses accepting a 0.2280-inch shank diameter.

Installation Notes

Installation of this drill bit is performed by machinists, maintenance technicians, and fabricators using standard drill press, hand drill, or magnetic drill equipment. Secure the straight cylindrical shank firmly in the chuck before use and verify runout before beginning a drilling cycle. Use appropriate cutting fluid for the workpiece material to prolong bit life and maintain hole quality. Always wear eye protection and secure the workpiece before drilling.