Hertel C.E06.0357 Aircraft Extension Drill Bit 28

Product Description

The HERTEL C.E06.0357 is a cobalt aircraft extension drill bit designed for drilling in hard metals, high-strength alloys, and aerospace-grade materials. It carries a wire gauge size of 28, equivalent to 0.1405 inches in decimal, with a 135-degree split point that self-centers on contact and reduces the need for a center punch. The straw finish indicates a heat-treated cobalt steel construction built to handle elevated cutting temperatures without losing hardness. The overall length of 6 inches gives technicians the reach needed for deep-access or obstructed-hole applications common in aircraft and industrial maintenance work. This bit is installed and used by aircraft maintenance technicians, machinists, and industrial maintenance professionals.

This bit is suited for aircraft structural work, sheet metal fabrication, and precision hole drilling in hard or abrasive materials where standard HSS bits wear prematurely. The 6-inch overall length is specifically useful in tight engine bays, airframe assemblies, and industrial fixtures where a standard-length bit cannot reach the work surface. The spiral flute geometry promotes chip evacuation in deep-hole applications, reducing heat buildup and drill wander. It is a general-purpose cobalt bit appropriate for both production drilling and field maintenance scenarios.

Key Features

• Cobalt tool material with straw finish for heat resistance and extended tool life in hard metals
• 135-degree split point is self-centering and reduces walking on smooth or curved surfaces
• Web-thinned, tapered web configuration reduces cutting resistance and improves chip flow
• 6-inch overall length provides extended reach for obstructed or deep-access drilling
• Right-hand spiral flute with 1.75-inch flute length evacuates chips efficiently
• Meets NAS 907 standard for aircraft drill bit performance

Compatibility

Designed as a general-purpose aircraft extension drill bit for use with standard straight-shank drill chucks in hand drills, drill presses, and right-angle drill motors accepting a 0.1405-inch shank diameter.

Installation Notes

This bit is used by machinists, aircraft maintenance technicians, and industrial trades working under applicable shop safety and aerospace maintenance standards. Secure the workpiece fully before drilling and confirm the drill chuck is tightened to eliminate runout. Use appropriate cutting fluid when drilling hard alloys to reduce heat at the cutting edge. Inspect the split point and flutes for wear or chipping before each use, as cobalt bits subjected to excessive heat or side loading may chip rather than deform gradually.