Precision Twist Drill 6001347 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001347 is a high speed steel aircraft extension drill bit designed for deep-reach drilling in metal fabrication, aerospace maintenance, and structural assembly work. The 17/64 inch (0.2656 inch decimal) diameter bit features a 135-degree split point that is self-centering and reduces the need for a center punch on most metals. With a flute length of 2.875 inches and an overall length of 12 inches, this Series 500-12 bit reaches into cavities and structural members that standard-length drill bits cannot access. Licensed trades and aerospace maintenance technicians are the primary users.

This drill bit is suited for drilling through aluminum sheet, mild steel, and other metals encountered in aircraft maintenance, HVAC equipment fabrication, structural steel work, and general industrial applications. The extended 12-inch overall length is the defining application feature, allowing access to confined or deep locations. The oxide finish provides moderate corrosion resistance and helps retain cutting fluid during use. Right-hand cutting direction is standard for use with conventional drill motors and drill presses.

Key Features

• 135-degree split point is self-centering, reducing walk on hard or curved surfaces
• 12-inch overall length provides extended reach into deep or confined workpieces
• 2.875-inch spiral flute length with 4xD flute-to-diameter ratio for efficient chip evacuation
• High speed steel construction suitable for ferrous and non-ferrous metals
• Straight-cylindrical shank fits standard 3-jaw chucks without an adapter
• Web-thinned tapered web reduces thrust force and extends cutting life
• Meets NAS 907 Type B standard for aircraft extension drill bits

Compatibility

Designed as an OEM-style replacement and general-use aircraft extension drill bit for applications requiring a 17/64 inch diameter, 12-inch overall length, straight-shank drill conforming to NAS 907 Type B specifications.

Installation Notes

This bit is installed by machinists, sheet metal workers, and maintenance technicians using a standard drill motor or drill press equipped with a 3-jaw chuck. Secure the straight-cylindrical shank fully in the chuck before use to prevent slippage under load. Use appropriate cutting fluid for the workpiece material to extend bit life and improve hole finish. Ensure the workpiece is properly clamped before drilling to prevent rotation or shifting during the cut.