Precision Twist Drill 6001395 Letter K Hss Aircraft Drill

Product Description

The PRECISION TWIST DRILL 6001395 is a Letter K (0.281 inches) high speed steel aircraft extension drill bit designed for deep-hole drilling applications where standard-length bits cannot reach. Built to Series 502-12 specifications and compliant with NAS 907 Type B standards, it features a 135-degree split point that is self-centering and web-thinned for reduced thrust and cleaner starts without a center punch. The oxide finish provides mild corrosion resistance and reduces friction during cutting. At 12 inches overall length with a 2.9375-inch spiral flute, this bit is suited for structural, aerospace, and maintenance drilling tasks performed by machinists, aircraft mechanics, and industrial technicians.

This extension drill is built for general-purpose drilling in applications that require extended reach, such as drilling through structural members, deep cavities, or obstructed workspaces. The straight-cylindrical shank at 0.281 inches diameter fits standard drill chucks without adapters. The right-hand cutting direction and two-flute spiral geometry are optimized for steel, aluminum, and other metals common in aircraft and industrial maintenance environments. The 4xD flute-to-diameter ratio supports chip evacuation in deeper cuts.

Key Features

• 135-degree split point with web thinning for self-centering starts and reduced thrust
• High speed steel construction for durability across metals and general-purpose materials
• 12-inch overall length for extended-reach drilling in confined or deep workspaces
• Oxide finish for mild lubricity and corrosion resistance
• Straight-cylindrical shank fits standard drill chucks directly
• NAS 907 Type B compliant for aerospace and industrial applications

Compatibility

Designed as an OEM-style replacement or direct-use extension drill bit for applications requiring a Letter K (0.281 inches) diameter, 12-inch overall length bit in Series 502-12 configurations meeting NAS 907 Type B standards.

Installation Notes

This bit is installed and operated by machinists, aircraft mechanics, or industrial maintenance technicians using a standard drill press, hand drill, or right-angle drill with a compatible chuck. Secure the straight-cylindrical shank firmly in the chuck before operation and verify the workpiece is properly clamped. Apply cutting fluid when drilling ferrous metals to extend bit life and reduce heat buildup. Inspect the split point and flutes for wear or chipping before each use, and replace the bit if the cutting edges are compromised.