Hertel C.E06.0409 Aircraft Extension Drill Bit 20

Product Description

The HERTEL C.E06.0409 is a cobalt aircraft extension drill bit designed for drilling in tight or deep-access areas where a standard-length bit cannot reach. Built to size 20 wire gauge (0.1610 inches decimal), it features a 135-degree split point that self-centers on contact and reduces the need for a center punch. The 6-inch overall length and 2.125-inch spiral flute provide extended reach while maintaining chip evacuation. A straw finish helps indicate heat treatment and provides light lubricity. This bit is appropriate for use by machinists, aviation maintenance technicians, and fabricators working with steel, stainless, and high-temperature alloys.

Aircraft extension drill bits are commonly used in aerospace fabrication, airframe repair, and industrial applications where fastener holes must be drilled in recessed or obstructed locations. The cobalt construction makes this bit well suited for hard materials and interrupted cuts. It is a general-purpose tool appropriate for both production drilling and field maintenance work where a standard jobber-length bit lacks reach. Web thinning reduces thrust requirements, making it easier to start holes cleanly without walking.

Key Features

• Cobalt tool material for heat resistance and durability in hard materials
• 135-degree split point with self-centering geometry eliminates pilot hole requirement
• Web-thinned tapered web reduces drilling thrust and extends tool life
• 6-inch overall length with 2.125-inch flute for extended reach in deep or obstructed drilling locations
• Straight cylindrical shank fits standard drill chucks without adapters
• Right-hand cutting spiral flute for efficient chip removal
• Meets NAS 907 standards for aircraft-quality drilling

Compatibility

Designed as an OEM-style replacement and general-purpose aircraft extension drill bit suitable for standard drill chucks accepting a 0.1610-inch straight cylindrical shank.

Installation Notes

Installation should be performed by qualified machinists or aviation maintenance technicians following applicable shop and regulatory procedures. Secure the bit firmly in the drill chuck and verify runout before beginning a drilling operation. Use appropriate cutting fluid when drilling hard metals or stainless alloys to extend tool life and reduce heat buildup. Do not exceed the recommended RPM range for the material being drilled.