Precision Twist Drill 6001489 Aircraft Extension Drill

Product Description

The PRECISION TWIST DRILL 6001489 is a Series 501-6 aircraft extension drill bit designed for precise hole-making in aerospace and general metalworking applications. Built from high speed steel with an oxide finish, this bit features a 135-degree split point that is self-centering, reducing the need for a center punch and minimizing walking on contact. The straight-cylindrical shank measures 0.1495 inches in diameter, matching the drill diameter for consistent chuck holding. With a right-hand spiral flute and web-thinned, tapered web construction, it cuts efficiently in a wide range of materials. Licensed HVAC, aircraft maintenance, and general trade professionals will find this bit suited to production and field drilling tasks.

This drill bit is sized to Wire Size 25 (0.1495 inches decimal equivalent) and carries a flute length of 1.875 inches with an overall length of 6 inches, providing the extended reach required for drilling in confined or recessed areas common in aircraft structures and industrial equipment. The general-purpose tool performance rating makes it appropriate for drilling mild steel, aluminum, and similar materials in both shop and field environments. It ships individually and meets NAS 907 Type B standards.

Key Features

• 135-degree split point is self-centering for accurate starting without center punch
• High speed steel construction provides durability across ferrous and non-ferrous materials
• Oxide finish reduces friction and helps resist corrosion during storage and use
• 6-inch overall length delivers extended reach for recessed or deep drilling applications
• Web-thinned tapered web reduces cutting resistance and improves chip clearance
• Right-hand spiral flute with 4xD flute-to-diameter ratio supports efficient chip evacuation

Compatibility

Meets NAS 907 Type B standards. Designed as a general-purpose aircraft extension drill bit for use in standard 3-jaw chucks and compatible drill motors accepting a 0.1495-inch straight-cylindrical shank.

Installation Notes

This bit is installed and used by machinists, aircraft maintenance technicians, and general trade professionals. Secure the shank fully in the chuck before operation and verify chuck key is removed prior to powering the drill. Use appropriate cutting fluid when drilling ferrous metals to extend tool life and improve cut quality. Inspect the cutting edges for wear or damage before each use and replace when the split point shows signs of rounding.