Hertel C.E03.0439 Aircraft Extension Drill Bit No. 17

Product Description

The HERTEL C.E03.0439 is a No. 17 wire-size aircraft extension drill bit designed for precision hole-making in aerospace and general metalworking applications. Built from high-speed steel with an oxide finish, this bit features a 135-degree split point for self-centering entry without a center punch. The 6-inch overall length and 2.1875-inch spiral flute length give the bit the reach needed in confined or deep-access work areas. A web-thinned, tapered-web construction reduces thrust load and improves chip evacuation. Right-hand cutting and a straight cylindrical shank make it compatible with standard drill chucks. This bit meets NAS 907 standards and is suited for production or maintenance use.

This aircraft extension drill bit is intended for drilling metal in tight or extended-reach locations where a standard-length bit cannot reach. Typical applications include airframe work, structural steel fabrication, and general-purpose metalworking where a longer reach is required with a No. 17 (0.1730 inch) diameter. The 6-inch body provides clearance over flanges, brackets, and recessed surfaces without requiring a drill extension attachment.

Key Features

• No. 17 wire size, 0.1730 inch diameter — matches standard No. 17 drill chart sizing
• 135-degree split point for self-centering drilling without a center punch
• Web-thinned, tapered-web design reduces cutting thrust and improves chip flow
• 6-inch overall length provides extended reach in confined or deep-access areas
• High-speed steel construction with oxide finish for wear and corrosion resistance
• Meets NAS 907 standard for aircraft-quality drill bits

Compatibility

Designed as a general-purpose aircraft extension drill bit for use in standard drill chucks accepting a 0.1730-inch straight cylindrical shank. Suitable for right-hand drilling in metal, consistent with NAS 907 tooling requirements.

Installation Notes

This drill bit is installed and operated by machinists, aerospace maintenance technicians, and metalworkers using standard handheld or drill-press equipment. Secure the straight shank firmly in a keyed or keyless chuck before operation. Ensure the workpiece is properly clamped before drilling to prevent bit walk or material shift. Inspect the cutting edges and web for wear or chipping before each use; a damaged point will reduce self-centering accuracy and increase the risk of bit breakage.