Hertel C.E07.0380 Aircraft Extension Drill Bit 25 Cobalt

Product Description

The HERTEL C.E07.0380 is a cobalt aircraft extension drill bit designed for drilling in hard and abrasion-resistant materials where standard-length bits cannot reach. Built to a 12-inch overall length with a straight cylindrical shank, this bit accepts the wire gauge size 25, equivalent to 0.1495 inches in diameter. The 135-degree split point is self-centering and reduces the need for a center punch, while the web-thinned, tapered web construction lowers cutting resistance. A straw finish indicates the cobalt steel has been heat-treated for improved hardness and wear resistance. Two right-hand spiral flutes clear chips efficiently during drilling operations.

This bit is suited for aerospace, sheet metal, and structural fabrication work where extended reach is required in confined or deep-access areas. The cobalt construction makes it appropriate for stainless steel, high-nickel alloys, titanium, and other difficult-to-machine metals commonly encountered in aircraft maintenance and industrial fabrication. It meets NAS 907 standards, making it appropriate for use in aerospace-grade drilling applications. Machinists, aircraft maintenance technicians, and metalworking tradespeople are the primary installers of this tooling.

Key Features

• Wire gauge size 25 (0.1495 inches) straight cylindrical shank for standard chuck compatibility
• 135-degree split point with self-centering geometry eliminates center-punch requirement
• Cobalt tool material with straw finish for heat resistance and extended tool life in hard metals
• 12-inch overall length provides extended reach into deep or obstructed work areas
• 1.875-inch spiral flute length with web-thinned tapered web reduces cutting torque
• Meets NAS 907 standard for aerospace drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907 standards, suitable for use in standard drill chucks and pneumatic drilling equipment accepting a 0.1495-inch straight cylindrical shank.

Installation Notes

This tooling is used by machinists, aerospace maintenance technicians, and metalworking professionals. Ensure the workpiece is securely clamped and the bit is fully seated in the chuck before drilling. Use appropriate cutting fluid when drilling stainless steel, titanium, or high-nickel alloys to extend tool life and prevent work hardening. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed.