Hertel C.E03.0676 Aircraft Extension Drill Bit Letter H

Product Description

The HERTEL C.E03.0676 is an aircraft extension drill bit sized to Letter H (0.2660 inches decimal) with a 135-degree split point and a web-thinned, tapered web configuration. Built from high-speed steel with an oxide finish, it delivers reliable cutting performance in deep-reach drilling applications. The spiral flute design measures 2.875 inches in flute length, with an overall length of 6 inches, giving technicians the extended reach needed to access fastener locations in confined or deep structural assemblies. The straight cylindrical shank (0.2660 inches diameter) seats securely in standard drill chucks. This bit meets NAS 907 standards and is suited for general-purpose drilling in aerospace and industrial environments.

Aircraft extension drill bits like the C.E03.0676 are used in aerospace maintenance, structural fabrication, and industrial assembly where standard-length bits cannot reach the work surface. The extended body allows drilling through stacked materials, deep flanges, or recessed bores without repositioning the workpiece. The self-centering split point reduces walking on entry, which is critical when working on pre-drilled or close-tolerance hole patterns. Right-hand cutting direction makes it compatible with all standard right-hand drill drivers and drill presses.

Key Features

• Letter H size, 0.2660 inches decimal diameter for precise hole sizing
• 135-degree split point with self-centering geometry reduces bit walking on entry
• Web-thinned tapered web lowers thrust and improves chip clearance
• 6-inch overall length provides extended reach into deep or confined drilling locations
• High-speed steel construction with oxide finish for general-purpose durability
• Meets NAS 907 standard for aircraft-quality drill bits

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard straight-shank drill chucks; suitable for aerospace maintenance, structural fabrication, and industrial drilling applications requiring extended reach.

Installation Notes

Installation and use should be performed by qualified machinists, aerospace maintenance technicians, or industrial trades familiar with drill bit selection and safe machine operation. Secure the bit fully in the chuck before operation and verify shank seating to prevent runout. Use appropriate cutting fluid or lubricant for the material being drilled to extend bit life and maintain hole quality. Always wear appropriate eye protection and follow applicable shop safety procedures when operating drill equipment.