Hertel C.E03.0749 Aircraft Extension Drill Bit Letter M

Product Description

The HERTEL C.E03.0749 is an aircraft extension drill bit sized to Letter M (0.2950 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 is designed for right-hand cutting in deep-reach drilling applications where a standard-length bit cannot access the work surface. The 6-inch overall length and 3.0625-inch spiral flute allow chips to evacuate efficiently even in extended-reach setups. Licensed HVAC technicians, aircraft maintenance professionals, and industrial tradespeople rely on this geometry for clean, self-centering entry without a pilot hole.

This bit is intended for general-purpose drilling in applications that require extended reach, such as airframe assembly, structural metalwork, and deep-cavity drilling in fabrication shops. The split-point tip reduces walking and thrust requirements, making it practical on drill presses and hand-held pneumatic or electric drills in both shop and field environments. It conforms to NAS 907 standards, which governs aircraft-quality drill bit geometry and tolerances.

Key Features

• Letter M size — 0.2950 inches decimal diameter for precise hole sizing
• 135-degree split point with self-centering geometry reduces bit walk and lowers required thrust
• Web-thinned tapered web improves cutting efficiency and chip clearance
• High-speed steel construction with oxide finish for wear resistance in general-purpose metalworking
• 6-inch overall length provides extended reach for deep-cavity and airframe drilling
• Meets NAS 907 aircraft drill bit standards

Compatibility

Designed as a general-purpose aircraft extension drill bit suitable for use in standard straight-shank drill chucks; conforms to NAS 907 dimensional and performance standards for aircraft-quality tooling.

Installation Notes

Install into a compatible straight-shank chuck and verify concentricity before drilling. Always secure the workpiece and wear appropriate eye and hand protection. When drilling metal, use cutting fluid or oil to extend tool life and maintain dimensional accuracy. Follow applicable workplace safety codes and material-specific drilling guidelines for feed rate and speed selection.