Precision Twist Drill 6001254 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001254 is a high speed steel aircraft extension drill bit designed for reaching deep or obstructed hole locations that standard-length drills cannot access. Built to wire size 22 (0.157 inches decimal), it features a 135-degree split point that is self-centering and eliminates the need for a center punch on most metals. The two-flute spiral design with web thinning and a tapered web configuration reduces cutting resistance and improves chip evacuation. At 12 inches overall length with a 2-inch flute length, this bit is suited for aviation, fabrication, and general metalworking applications. The oxide finish provides light surface protection. Licensed HVAC and sheet metal technicians, aviation maintenance techs, and industrial fabricators are the primary installers.

This drill bit is built to NAS 907 Type B standards, making it appropriate for aerospace and precision metalworking environments. The straight-cylindrical shank at 0.157 inches diameter fits standard drill chucks without modification. Its extended reach makes it a practical choice for drilling through structural assemblies, firewall penetrations, sheet metal stacks, and tight-clearance installations where a jobber-length bit would not seat properly. Right-hand cutting direction is standard for conventional drill press and handheld electric drill use.

Key Features

• Wire size 22 (0.157 inches) with matching straight-cylindrical shank diameter for secure chuck grip
• 135-degree split point with self-centering geometry reduces walking without a center punch
• Web-thinned, tapered web construction lowers thrust force and improves chip flow
• 12-inch overall length provides extended reach into deep or restricted drilling locations
• High speed steel construction rated for general-purpose cutting in ferrous and non-ferrous metals
• Meets NAS 907 Type B standard for aerospace-grade drill bit performance

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 0.157-inch straight-cylindrical shank, suitable for right-hand drilling operations in metalworking and aviation maintenance applications.

Installation Notes

Installation should be performed by qualified machinists, aviation maintenance technicians, or experienced fabricators familiar with proper drilling technique in metal substrates. Secure the workpiece firmly before drilling and confirm chuck tightness before operation. Use appropriate cutting fluid for ferrous metals to extend bit life and maintain hole quality. Inspect the split point for chipping or wear before each use and replace if point geometry is compromised.