Hertel C.E05.0958 Aircraft Extension Drill Bit Letter V

Product Description

The HERTEL C.E05.0958 is an aircraft extension drill bit sized to Letter V (0.3770 inches decimal equivalent) with a 12-inch overall length designed for deep-reach drilling applications where standard-length bits cannot access the work area. It features a 135-degree split point that is self-centering and reduces the need for a center punch before drilling. The two-flute spiral configuration and web-thinned, tapered web construction reduce thrust and improve chip evacuation. The high-speed steel body carries an oxide finish for basic lubricity and corrosion resistance. This bit meets NAS 907 standards and is suited for general-purpose metal drilling in aerospace, structural, and fabrication work.

Aircraft extension drill bits like the C.E05.0958 are used when drilling through airframe structures, deep cavities, tubing assemblies, or obstructed areas on production floors and in MRO environments. The 12-inch length gives access that standard jobber-length bits cannot reach. The straight cylindrical shank seats directly into standard drill chucks. The 3.625-inch flute length provides adequate chip clearance even when the bit is partially extended into a confined bore. Machinists, aircraft mechanics, and structural fabricators are the primary users of this bit type.

Key Features

• Letter V size, 0.3770 inches decimal equivalent, for precise hole sizing
• 135-degree split point is self-centering and eliminates the need for spotting
• 12-inch overall length for deep-reach and obstructed-area drilling
• Web-thinned, tapered web reduces drilling thrust and improves cutting efficiency
• Two-flute right-hand spiral design promotes consistent chip evacuation
• Meets NAS 907 standard for aircraft-quality drill bits

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit compatible with standard drill chucks accepting a 0.3770-inch straight cylindrical shank.

Installation Notes

This bit is installed and serviced by machinists, aircraft mechanics, and metalworking professionals. Secure the straight cylindrical shank firmly in a keyed or keyless chuck before use and verify runout before drilling into finished structure. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole quality. Inspect the cutting edges and point for wear or chipping before each use and discard bits that show damage to avoid oversized or out-of-round holes.