Precision Twist Drill 6001380 Letter H Hss Aircraft Drill

Product Description

The PRECISION TWIST DRILL 6001380 is a Letter H aircraft extension drill bit designed for deep-reach drilling applications in metal, aerospace structures, and industrial fabrication work. Built from high speed steel (HSS) with an oxide finish, it features a 135-degree split point that self-centers on contact, reducing the need for a center punch and minimizing walking on hard surfaces. The straight-cylindrical shank measures 0.266 inches in diameter, and the two-flute spiral design with a web-thinned, tapered web configuration promotes clean chip evacuation in extended-depth holes. This drill is part of PRECISION TWIST DRILL Series 502-12 and is installed by machinists, aircraft maintenance technicians, and industrial trade professionals.

This drill bit is suited for through-hole and extended-reach drilling in sheet metal, structural aluminum, and steel in both production and MRO settings. The 12-inch overall length gives technicians the reach needed to access recessed or obstructed hole locations common in aircraft and heavy equipment frames. The right-hand cutting direction and general-purpose tool performance rating make it a practical fit for standard drill press and hand-drill applications where standard-length bits cannot reach.

Key Features

• 135-degree split point for self-centering starts and reduced thrust force
• High speed steel construction for durability in metal drilling applications
• Oxide finish for basic corrosion and wear resistance
• 12-inch overall length for extended-reach access in deep or obstructed locations
• Web-thinned tapered web for improved chip flow in deep holes
• Meets NAS 907 Type B standards for aircraft-grade drilling applications

Compatibility

Designed as an OEM-style aircraft extension drill bit in Letter H size (0.266 inches decimal equivalent), compatible with standard straight-shank drill chucks accepting a 0.266-inch shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists or licensed maintenance technicians familiar with metal drilling procedures. Secure the workpiece firmly before drilling and confirm chuck grip on the full shank length to prevent slippage during operation. Reduce spindle speed and apply cutting fluid when drilling hardened steel or thick aluminum to extend tool life and prevent overheating. Inspect the split point for wear or chipping before each use and replace the bit if tip integrity is compromised.