Hertel C.E05.0803 Aircraft Extension Drill Bit Letter O

Product Description

The HERTEL C.E05.0803 is an aircraft extension drill bit designed for deep-reach drilling applications where a standard-length bit cannot access the work area. Built from high-speed steel with an oxide finish, this bit carries a Letter O size designation, corresponding to a decimal diameter of 0.3160 inches. The 135-degree split point promotes self-centering on entry, reducing walking and the need for a center punch on most surfaces. With a 12-inch overall length and a 3.1875-inch spiral flute, it delivers chip evacuation in extended-reach conditions. A two-flute, right-hand cutting geometry and web-thinned, tapered web configuration reduce thrust requirements during drilling. Licensed HVAC techs, aviation maintenance technicians, and sheet metal workers reach for this bit when working through airframes, ductwork, and structural panels.

This aircraft extension drill bit is suited for general-purpose drilling in ferrous and non-ferrous metals, plastics, and composite materials where extended reach is required. The straight cylindrical shank seats in standard drill chucks without modification. Typical applications include drilling through deep cavities, confined structural members, and overlapping sheet metal panels in both production and field service environments. The NAS 907 standard compliance makes it appropriate for aerospace and aviation maintenance contexts where dimensional and performance standards are specified by the work order.

Key Features

• Letter O size, 0.3160 inches decimal diameter for precise hole sizing
• 135-degree split point with self-centering entry reduces walk and eliminates center punch in most applications
• 12-inch overall length provides extended reach into deep cavities and confined structures
• High-speed steel construction with oxide finish for corrosion resistance and lubricity
• Web-thinned, tapered web reduces drilling thrust and improves bit life on tougher materials
• Meets NAS 907 standard for aerospace and aviation maintenance applications

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 0.3160-inch straight cylindrical shank. Suitable for use with corded or cordless right-hand drill drivers in aviation maintenance, HVAC fabrication, and sheet metal applications.

Installation Notes

Installation and use should be performed by trained technicians familiar with metalworking drill practices. Ensure the workpiece is securely clamped and the drill is running at the appropriate speed for the material and bit diameter before contact. Verify chuck jaws are fully tightened on the straight shank before applying cutting pressure. Follow applicable workplace safety standards and, where aerospace work orders apply, adhere to NAS or applicable OEM drilling specifications.