Precision Twist Drill 6001415 No. 47 Hss Extension Drill

Product Description

The PRECISION TWIST DRILL 6001415 is a wire gauge No. 47 aircraft extension drill bit designed for deep-reach drilling applications in aerospace and general metalworking. The bit measures 0.0785 inches in diameter with a 12-inch overall length, giving technicians the reach needed to access fastener locations in confined airframe structures and deep-cavity assemblies. Made from high speed steel with an oxide finish, it features a 135-degree split point for self-centering entry without a center punch. The spiral flute geometry and web-thinned, tapered web construction improve chip evacuation and reduce feed force on right-hand drilling operations.

This extension drill is suited for aerospace maintenance, sheet metal fabrication, and general manufacturing environments where standard-length bits cannot reach the work surface. The 12-inch overall length and straight-cylindrical shank allow it to seat in standard drill chucks and extension holders. It is a general-purpose tool appropriate for use in portable air drills, drill presses, and CNC spindles where a No. 47 wire gauge hole is required in steel, aluminum, or similar metals. The Series 501-12 designation identifies it as part of a coordinated line of aircraft extension drills in matching wire gauge sizes.

Key Features

• Wire gauge No. 47 diameter: 0.0785 inches, consistent with NAS 907 Type B standards
• 135-degree split point is self-centering, reducing walk-out on curved or coated surfaces
• 12-inch overall length provides extended reach for deep-cavity and airframe drilling
• High speed steel construction with oxide finish for corrosion resistance and lubricity
• Web-thinned tapered web reduces thrust load and improves chip clearance
• 2-flute right-hand spiral geometry for efficient chip evacuation

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill for use wherever a wire gauge No. 47 diameter hole is required; compatible with standard straight-shank drill chucks and extension holders accepting a 0.0785-inch shank.

Installation Notes

This drill bit is installed and operated by machinists, aerospace mechanics, and sheet metal technicians. Secure the straight-cylindrical shank fully in the chuck to the depth of the chuck jaws before drilling to minimize runout and shank slippage. Disengage and de-energize all power sources before changing bits in any rotary tool. Follow applicable workplace safety standards and manufacturer speed-and-feed recommendations for the workpiece material; do not exceed rated spindle speeds for the bit diameter and material combination.