Hertel C.E03.0663 Aircraft Extension Drill Bit Letter G

Product Description

The HERTEL C.E03.0663 is an aircraft extension drill bit sized to Letter G (0.2610 inches decimal equivalent) with a 135-degree split point and a web-thinned, tapered web configuration. Built from high-speed steel with an oxide finish, this bit is designed for general-purpose drilling in extended-reach applications where standard-length bits cannot access the work area. The self-centering split point eliminates the need for a center punch and reduces walking on entry. Right-hand spiral flutes evacuate chips efficiently during through-hole drilling. Licensed HVAC technicians, aviation maintenance technicians, millwrights, and metal fabricators are the primary users of this tool type.

This bit is suited for drilling metal in aerospace maintenance, sheet-metal fabrication, and general industrial applications where a longer reach is required. The 6-inch overall length combined with the 2.875-inch flute length gives access to recessed or obstructed drilling locations. The straight cylindrical shank seats directly into standard drill chucks without adapters. General-purpose performance rating makes it appropriate for mild steels, aluminum, and similar materials in production or field service environments.

Key Features

• Letter G size — 0.2610 inches decimal equivalent for precise hole sizing
• 135-degree split point with self-centering geometry — reduces walking and eliminates center-punch step
• Web-thinned tapered web reduces thrust and improves chip evacuation
• High-speed steel construction with oxide finish for corrosion and heat resistance
• 6-inch overall length for extended-reach drilling in tight or recessed locations
• Meets NAS 907 standard for aircraft-quality drill bit performance

Compatibility

Designed as an OEM-style replacement or direct-fit aircraft extension drill bit for use in any standard drill chuck accepting a 0.2610-inch straight cylindrical shank.

Installation Notes

This bit is installed by machinists, aviation maintenance technicians, sheet-metal workers, and industrial mechanics using standard keyed or keyless drill chucks. Ensure the chuck is fully tightened and the workpiece is securely clamped before operation. Use appropriate cutting fluid for the material being drilled to extend bit life and improve hole quality. Inspect the cutting edges for wear or chipping before each use and replace if the split point geometry is compromised.