Hertel C.E05.1151 Aircraft Extension Drill Bit 29/64 in

Product Description

The HERTEL C.E05.1151 is a 29/64-inch 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, it features a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. The bit runs a 2-flute spiral configuration with a web-thinned, tapered web for reduced thrust and cleaner chip evacuation. Overall length is 12 inches with a 4.1875-inch flute length, making it well suited for structural drilling in tight or extended-reach conditions. Cutting direction is right hand. Shank diameter matches the bit diameter at 0.4531 inches, fitting standard straight-cylindrical chuck configurations.

Aircraft extension drill bits like the C.E05.1151 are used in fabrication, maintenance, and repair work where standard jobber-length bits fall short. Typical applications include drilling through structural members, deep stacked materials, or assemblies where the drill chuck must remain clear of the work surface. This bit is a general-purpose tool appropriate for metal, plastic, and composite materials. It is commonly used by aerospace and industrial maintenance technicians, millwrights, pipefitters, ironworkers, and HVAC sheet metal fabricators who routinely encounter deep or obstructed drilling conditions.

Key Features

• 29/64-inch (0.4531 inches) diameter with matching straight-cylindrical shank for secure chuck engagement
• 135-degree split point with self-centering geometry reduces walking without a center punch
• Web-thinned tapered web lowers cutting thrust and improves chip flow
• 12-inch overall length provides extended reach for structural and deep-access drilling
• 2-flute spiral design for efficient chip evacuation in metal and composite materials
• High-speed steel construction with oxide finish for general-purpose durability

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard 3-jaw drill chuck or right-hand drive accepting a straight-cylindrical 29/64-inch shank.

Installation Notes

Installation of this bit requires a drill press, hand drill, or right-angle drill with a straight-cylindrical chuck rated for the shank diameter. Secure the shank fully into the chuck before operation and confirm the workpiece is clamped or fixtured to prevent movement. When drilling metal, use appropriate cutting fluid to extend tool life and reduce heat buildup. Always wear appropriate eye protection and follow applicable shop safety and OSHA standards for drilling operations.