Hertel C.E05.1072 Aircraft Extension Drill Bit 27/64 in

Product Description

The HERTEL C.E05.1072 is a 27/64 inch diameter aircraft extension drill bit designed for deep-reach drilling applications in metal fabrication, aerospace maintenance, and structural work. Built from high-speed steel with an oxide finish, the bit features a 135-degree split point that self-centers on contact and reduces the need for a center punch. The 12-inch overall length gives technicians the reach needed to access tight or deep locations that standard-length bits cannot reach. With a 3-15/16 inch spiral flute length and two right-hand cutting flutes, this bit clears chips efficiently during extended cuts. It is a general-purpose tool suited for production and field use.

This aircraft extension drill bit is used in applications where extended reach is required, such as drilling through structural panels, fuselage sections, sheet metal assemblies, or deep-set workpieces in fabrication and maintenance environments. The straight cylindrical shank seats securely in standard drill chucks, and the tapered web configuration reduces cutting resistance. Licensed mechanics, machinists, and sheet metal technicians working in aviation, industrial, or general manufacturing settings are the primary users of this tool.

Key Features

• 27/64 inch diameter (0.4219 inches decimal) for precise hole sizing
• 135-degree split point with self-centering geometry eliminates center-punch step
• 12-inch overall length provides extended reach into deep or confined areas
• High-speed steel construction with oxide finish for wear resistance
• Right-hand spiral flute with web thinning reduces thrust and improves chip evacuation
• Straight cylindrical shank compatible with standard drill chucks

Compatibility

Designed for use in standard keyed or keyless drill chucks accepting a 27/64 inch straight cylindrical shank. Suitable for general-purpose drilling in ferrous and non-ferrous metals, plastics, and similar materials where an extended-length bit is required.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or mechanics familiar with proper drilling techniques and safety practices. Secure the shank fully in the chuck before operation and verify chuck tightness to prevent bit slippage. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend tool life and maintain dimensional accuracy. Wear appropriate eye protection and secure the workpiece before drilling.