Precision Twist Drill 6001414 Letter N Hss Extension Drill

Product Description

The PRECISION TWIST DRILL 6001414 is a Letter N aircraft extension drill bit designed for deep-hole drilling in aerospace, structural, and industrial applications. Built from high speed steel with an oxide finish, this bit measures 0.302 inches in diameter and reaches 12 inches in overall length, making it the right tool when standard-length bits cannot reach the work zone. The 135-degree split point is self-centering and web-thinned, which reduces walking on entry and lowers thrust force needed to start a hole. Two spiral flutes evacuate chips efficiently during extended drilling passes.

This drill bit is suited for use in aircraft maintenance, sheet metal work, structural fabrication, and any application where a 12-inch extension reach is required. The straight-cylindrical shank fits standard drill chucks without an adapter. The Series 502-12 designation places this bit in Precision Twist Drill's general-purpose aircraft extension line. It is commonly used by aerospace technicians, maintenance mechanics, and fabricators working on assemblies where direct access to the workpiece face is restricted.

Key Features

• Letter N (0.302 inches) diameter for precise hole sizing in standard letter-drill applications
• 12-inch overall length provides extended reach into deep or obstructed work areas
• 135-degree split point with web thinning is self-centering and reduces thrust on entry
• High speed steel construction handles a broad range of metals and hard plastics
• Oxide finish improves lubricity and provides basic corrosion resistance during storage and use
• Tapered web configuration with 2-flute spiral design for efficient chip evacuation
• Meets NAS 907 Type B standards for aircraft extension drill bits

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907 Type B. Fits standard drill chucks accepting a 0.302-inch straight-cylindrical shank.

Installation Notes

Installation of this drill bit is performed by a machinist, aircraft mechanic, or fabricator using a standard keyed or keyless drill chuck. Secure the straight shank firmly in the chuck before operation to prevent slippage during extension drilling. Use appropriate cutting fluid for the workpiece material, especially when drilling steel or aluminum alloy. Always wear eye protection and secure the workpiece before beginning the cut.