Hertel C.E06.0431 Aircraft Extension Drill Bit 18 Cobalt

Product Description

The HERTEL C.E06.0431 is a cobalt aircraft extension drill bit designed for drilling in tight or deep-access locations where a standard-length bit cannot reach. Built to a 135-degree split point with web thinning, it self-centers on contact and reduces the thrust required to start a hole. The straight cylindrical shank measures 0.1695 inches in diameter, matching the wire gauge size 18 decimal equivalent. The straw finish indicates the cobalt steel was heat-treated during manufacture. This bit is suited for HVAC sheet metal work, aircraft maintenance, and general metalworking applications where an extended reach is required. Right-hand cutting spiral flutes clear chips efficiently through a 2.125-inch flute length.

This aircraft extension drill bit is intended for use in hand-held or drill-press applications where extended reach into confined spaces is needed. Common applications include drilling through structural sheet metal, HVAC ductwork flanges, aluminum panels, and light steel assemblies. The cobalt construction provides heat resistance suitable for harder alloys and stainless steel. The 6-inch overall length gives the technician added reach compared to a jobber-length bit, making it practical for automotive, aerospace ground support, and mechanical contractor work.

Key Features

• Cobalt tool material with straw finish for heat resistance and durability in ferrous and hard alloys
• 135-degree split point with web thinning for self-centering and reduced entry thrust
• 6-inch overall length for extended reach into confined or deep-access locations
• Spiral flute with right-hand cutting direction for efficient chip evacuation
• Straight cylindrical shank at 0.1695 inches diameter for standard chuck compatibility
• Meets NAS 907 standard for aircraft extension drill bits

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard 3-jaw drill chucks accepting a 0.1695-inch straight cylindrical shank. Suitable for use in hand drills, right-angle drills, and drill presses.

Installation Notes

Installation and use of this drill bit should be performed by qualified technicians familiar with metal drilling procedures. Secure the workpiece before drilling and ensure the chuck is fully tightened on the shank before operation. Use appropriate cutting fluid when drilling hardened steels or stainless to extend bit life and manage heat buildup. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.