Hertel C.E07.0198 Aircraft Extension Drill Bit 5/64 in

Product Description

The HERTEL C.E07.0198 is a cobalt aircraft extension drill bit designed for drilling in tight-clearance and hard-to-reach applications where a standard-length bit cannot reach. Built from cobalt tool steel with a straw finish, this bit delivers heat resistance and edge retention when working through hardened steel, stainless, and aerospace-grade alloys. The 135-degree split point starts on contact without a center punch, reducing walking on curved or angled surfaces. At 12 inches overall length with a 1-inch spiral flute, it provides reach without sacrificing chip evacuation. Right-hand cutting direction and a straight cylindrical shank make it compatible with standard drill chucks and magnetic-base units used in structural and fabrication work.

This bit is sized at 5/64 inch (0.0781 inch decimal) and is suited for aerospace, sheet metal, and general structural fabrication applications where extended reach is required. The web-thinned, tapered web configuration reduces thrust and improves penetration in deep-hole work. It meets NAS 907 standards, making it appropriate for use in aerospace and precision manufacturing environments. Machinists, aviation maintenance technicians, and structural fabricators are the primary installers.

Key Features

• Cobalt construction with straw finish for heat resistance and extended tool life in hard materials
• 135-degree split point with web thinning for self-centering starts without a center punch
• 12-inch overall length provides extended reach in confined or deep structural cavities
• Straight cylindrical shank compatible with standard drill chucks
• Right-hand spiral flute geometry promotes efficient chip evacuation
• Meets NAS 907 standard for aerospace drill bit applications

Compatibility

Designed as an OEM-style general purpose aircraft extension drill bit meeting NAS 907 standards, compatible with standard drill chucks accepting a 5/64-inch straight cylindrical shank.

Installation Notes

This bit is installed and operated by machinists, aviation maintenance technicians, or structural fabricators using standard or magnetic-base electric drills. Ensure the chuck is securely tightened on the straight shank before operation. Use appropriate cutting fluid when drilling hardened or stainless alloys to preserve edge life. Always wear eye protection and secure the workpiece before drilling.