Hertel C.E05.0397 Aircraft Extension Drill Bit 5/32 in Hss

Product Description

The HERTEL C.E05.0397 is an aircraft extension drill bit engineered for deep-reach drilling applications where a standard-length bit cannot access the work area. Built from high-speed steel with an oxide finish, this bit measures 5/32 inch (0.1563 inch decimal) in diameter and carries a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. The 12-inch overall length with a 2-inch spiral flute section gives technicians the reach needed in confined or layered-material work without sacrificing chip evacuation. Right-hand cutting direction and a straight cylindrical shank make it compatible with standard drill chucks.

This bit is suited for general-purpose drilling in metal, composite panels, and sheet materials common in aerospace maintenance, HVAC ductwork fabrication, and structural sheet metal work. The extended length is especially useful when drilling through aircraft fuselage panels, structural members, or other assemblies where standard bits fall short. Licensed HVAC sheet metal installers, aircraft maintenance technicians, and industrial maintenance trades will find this bit useful for reaching fastener holes in recessed or layered assemblies. The web-thinned, tapered web design reduces drilling resistance and thrust requirements.

Key Features

• 135-degree split point self-centers on curved or flat metal surfaces, reducing bit walking
• 12-inch overall length provides extended reach in deep or confined work areas
• High-speed steel construction handles the heat and wear demands of repetitive metal drilling
• Oxide finish provides mild corrosion resistance and reduces friction during cutting
• Web-thinned tapered web lowers thrust requirements and improves chip flow
• Two-flute spiral design clears chips efficiently during deep-hole drilling

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 5/32-inch straight cylindrical shank.

Installation Notes

This bit is intended for use by qualified trade and maintenance technicians working with appropriate drilling equipment. Secure the workpiece before drilling and confirm the chuck is tightened fully around the straight shank before operation. Use cutting fluid or lubricant when drilling hard metals to extend bit life and reduce heat buildup. Wear appropriate PPE including eye protection whenever operating drilling equipment.