Hertel C.E05.0345 Aircraft Extension Drill Bit No. 29

Product Description

The HERTEL C.E05.0345 is an aircraft extension drill bit designed for reaching deep or obstructed hole locations that standard-length bits cannot access. Built from high-speed steel with an oxide finish, this bit measures 12 inches in overall length and carries a No. 29 wire gauge designation, equal to 0.1360 inch in decimal. The 135-degree split point is self-centering and web-thinned, reducing thrust and walking on entry. Two spiral flutes with a 1.75-inch flute length clear chips efficiently during right-hand cutting. Licensed HVAC technicians, electricians, plumbers, and aviation maintenance professionals use this bit wherever extended reach into tight assemblies is required.

This bit suits general-purpose drilling in sheet metal, aluminum, plastics, and light steel encountered in aircraft structures, HVAC equipment cabinets, electrical panels, and plumbing access points. Its straight cylindrical shank fits standard drill chucks without modification. The 12-inch body length makes it practical for drilling through wall cavities, structural channels, and layered materials where a jobber-length bit would fall short. Professionals working to NAS 907 standards will recognize this bit as conforming to that aerospace specification.

Key Features

• No. 29 wire gauge size — 0.1360 inch decimal diameter
• 12-inch overall length for extended reach into deep or restricted locations
• 135-degree split point is self-centering and reduces walking on entry
• Web-thinned, tapered web design lowers drilling thrust
• High-speed steel construction with oxide finish for durability and chip resistance
• Right-hand spiral flutes with 1.75-inch flute length for efficient chip evacuation
• Meets NAS 907 aerospace standard

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 0.1360-inch straight cylindrical shank. Suitable for right-hand drilling applications in aerospace, HVAC, electrical, and plumbing service work.

Installation Notes

Insert the straight cylindrical shank fully into the drill chuck and tighten securely before use. Confirm drilling speed is appropriate for the material being drilled — lower speeds are recommended for harder metals. Wear appropriate eye protection and secure the workpiece before drilling. This bit cuts right-hand only and should not be run in reverse under load.