Hertel C.E05.1026 Aircraft Extension Drill Bit Letter Y

Product Description

The HERTEL C.E05.1026 is an aircraft extension drill bit sized at Letter Y (0.4040 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 extended-reach drilling in tight or deep access situations typical in aerospace, structural, and sheet metal work. The 12-inch overall length combined with a 3.875-inch spiral flute gives technicians the reach needed to bore through layered materials where a standard-length bit cannot access the workpoint. A self-centering split point starts on contact without a center punch, reducing walking on hard surfaces.

This bit is suited for general-purpose metal drilling applications requiring extended reach, including airframe maintenance, structural steel fabrication, and industrial assembly work. The right-hand cutting direction and two-flute spiral geometry clear chips efficiently during through-hole operations in steel, aluminum, and similar materials. It meets NAS 907 standards, making it appropriate for aerospace and defense maintenance environments where dimensional and performance traceability is required.

Key Features

• Letter Y size — 0.4040 inches decimal diameter for precise hole sizing
• 135-degree split point with self-centering geometry — no center punch required
• 12-inch overall length for extended-reach drilling in confined or deep-access locations
• High-speed steel construction with oxide finish for wear resistance
• Web-thinned tapered web reduces thrust and improves chip clearance
• Meets NAS 907 standard for aerospace and industrial applications

Compatibility

Designed as a general-purpose extended-reach drill bit for use in aircraft maintenance, structural fabrication, and industrial assembly applications requiring NAS 907-compliant tooling.

Installation Notes

Install into a compatible straight-shank drill chuck rated for the 0.4040-inch shank diameter. Verify drill press or handheld drill speed settings are appropriate for the target material before beginning. Secure the workpiece firmly before drilling to prevent movement during bit engagement. Inspect the cutting edges and flutes for wear or damage before each use, as extended-length bits are subject to increased deflection under side load.