Hertel C.E06.0391 Aircraft Drill Bit No.23 Cobalt

Product Description

The HERTEL C.E06.0391 is a cobalt aircraft extension drill bit designed for drilling in hard metals, stainless steel, and high-strength alloys where standard high-speed steel bits fall short. It features a 135-degree split point that is self-centering and web-thinned, eliminating the need for a center punch and reducing walking on entry. The straw finish indicates heat-treated cobalt steel construction. With a 6-inch overall length and a No. 23 wire gauge size (0.1540 inches decimal), this bit reaches into recessed or deep-clearance locations that shorter bits cannot access. Right-hand spiral flutes evacuate chips efficiently during drilling operations.

This bit is suited for aerospace, aviation maintenance, and precision metalworking applications where NAS 907 standards apply. The extended length makes it particularly useful for airframe drilling, structural repair, and situations requiring reach beyond standard jobber-length tooling. It is installed in standard straight-shank drill chucks on corded or pneumatic hand drills, drill presses, and CNC spindles. General-purpose performance rating makes it appropriate for production and maintenance shop use across a range of ferrous and non-ferrous materials.

Key Features

• Cobalt tool material for heat resistance and durability in hard and abrasive metals
• 135-degree split point with web thinning for self-centering entry and reduced thrust
• 6-inch overall length provides extended reach for aircraft and structural drilling
• Straw finish indicates cobalt steel heat treatment for improved hardness retention
• Right-hand spiral flutes with tapered web configuration for efficient chip evacuation
• Meets NAS 907 standard for aircraft-quality drill tooling

Compatibility

Designed as an OEM-style replacement and general-purpose aircraft extension drill bit for use in straight-shank drill chucks accepting a 0.1540-inch shank diameter.

Installation Notes

Secure the bit firmly in a properly rated drill chuck before operation and verify chuck key is removed prior to powering the tool. Use appropriate cutting fluid or lubricant when drilling hard metals to extend tool life and maintain cutting edge integrity. Wear appropriate PPE including eye protection when operating any drill bit. Follow applicable shop safety protocols and manufacturer guidelines for feed rate and spindle speed when drilling high-strength alloys.