Precision Twist Drill 6001172 19/64 in Hss Extension Drill

Product Description

The PRECISION TWIST DRILL 6001172 is a high speed steel aircraft extension drill bit designed for reaching into deep or recessed work areas that standard-length drills cannot access. Built to Series 500-6 specifications, it features a 135-degree split point that is self-centering and eliminates the need for a center punch on most materials. The web-thinned, tapered web construction reduces thrust and improves chip evacuation. At 19/64 inch (0.2969 inch decimal) in diameter and 6 inches overall length, this bit is suited for precision drilling in metal fabrication, aerospace, and structural applications where extension reach is required.

This drill bit is used in applications requiring extended reach beyond a standard jobber-length bit. Common scenarios include drilling through structural members, deep flanges, or assemblies where a chuck cannot be positioned close to the work surface. The right-hand spiral flute design and oxide finish make it appropriate for general-purpose drilling in steel, aluminum, and similar materials. Licensed technicians, aviation maintenance personnel, and metalworking professionals typically specify this type of bit for NAS 907 Type B compliant work.

Key Features

• 135-degree split point for self-centering starts without a center punch
• Web-thinned, tapered web reduces drilling thrust and improves chip flow
• High speed steel construction for durability in metal drilling applications
• Oxide finish provides mild corrosion resistance and reduced friction
• Straight-cylindrical shank compatible with standard drill chucks
• Meets NAS 907 Type B standards

Compatibility

Designed as an OEM-style replacement or direct-application aircraft extension drill bit for use in standard drill chucks accepting a straight-cylindrical shank at 19/64 inch diameter.

Installation Notes

This bit is installed by qualified machinists, aviation maintenance technicians, or metalworking tradespeople. Secure the straight-cylindrical shank firmly in a properly sized drill chuck before use. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Use appropriate cutting fluid for the material being drilled to extend bit life and maintain hole quality.