Hertel C.E06.0541 Aircraft Extension Drill Bit Cobalt

Product Description

The HERTEL C.E06.0541 is a cobalt aircraft extension drill bit designed for drilling in hard and abrasive materials where standard high-speed steel bits fall short. Built to wire size 3 (0.2130 inches decimal equivalent), this bit features a 135-degree split point for self-centering entry and reduced walking on curved or irregular surfaces. The straw finish indicates a heat-treated cobalt construction suited to demanding production and maintenance drilling applications. Licensed HVAC technicians, aircraft maintenance techs, and industrial tradespeople rely on cobalt extension bits when access depth exceeds the reach of a standard-length drill.

This bit is appropriate for drilling aluminum, stainless steel, titanium, and other hard alloys commonly encountered in aerospace, HVAC sheet metal, and mechanical maintenance work. The extended 6-inch overall length with a 2.5-inch spiral flute allows drilling in recessed or hard-to-reach locations without an adapter. The straight cylindrical shank is compatible with standard drill chucks and quick-change holders.

Key Features

• Cobalt tool material with straw finish for heat resistance and extended tool life in hard materials
• 135-degree split point with web thinning for self-centering, reduced thrust, and cleaner entry
• Wire size 3 diameter — 0.2130 inches decimal equivalent
• 6-inch overall length for reach into deep or obstructed drill locations
• 2.5-inch spiral flute length with tapered web configuration for efficient chip evacuation
• Right-hand cutting direction, two-flute design; meets NAS 907 standard

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard straight-cylindrical chuck systems. Suitable for use in hand drills, drill presses, and right-angle drill attachments that accept a 0.2130-inch straight shank. Meets NAS 907 requirements.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and sheet metal tradespeople. Secure the straight shank fully in the chuck before operation and verify runout is within acceptable limits for the application. Use appropriate cutting fluid when drilling stainless steel or titanium to manage heat buildup and preserve cutting-edge life. Inspect the cutting edges for wear or chipping before each use and replace if the point geometry is compromised.