Precision Twist Drill 6001266 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001266 is a high speed steel aircraft extension drill bit designed for drilling in hard-to-reach locations where standard-length bits fall short. Built to Series 501-12 specifications and compliant with NAS 907 Type B standards, this bit features a 135-degree split point that is self-centering, eliminating the need for a center punch on most surfaces. The 0.147-inch diameter straight-cylindrical shank corresponds to wire size 26. A black oxide finish provides mild corrosion resistance during storage and use. Licensed HVAC techs, sheet metal workers, aerospace maintenance crews, and general mechanical tradespeople reach for this bit when working inside airframes, equipment cabinets, and tight structural assemblies.

This drill bit is suited for general-purpose drilling in metal, plastic, and composite materials encountered in aircraft maintenance, HVAC fabrication, and mechanical service work. The 12-inch overall length gives clearance in confined spaces while the 1.875-inch spiral flute length handles chip evacuation efficiently. Right-hand cutting direction is standard for use with conventional drill motors and drill presses. The 4xD flute-to-diameter ratio keeps the bit rigid over its extended reach.

Key Features

• 135-degree split point with self-centering geometry reduces walk-off on curved or painted surfaces
• 12-inch overall length provides reach into deep cavities and confined structural spaces
• High speed steel construction handles ferrous metals, aluminum alloys, and plastics
• Black oxide finish offers light corrosion protection and reduces glare during use
• Web-thinned tapered web reduces thrust force required at the cutting edge
• NAS 907 Type B compliant for aircraft maintenance applications

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit compatible with any standard drill chuck or drill press accepting a 0.147-inch straight-cylindrical shank.

Installation Notes

Install in a keyed or keyless chuck rated for the drill motor speed appropriate to the material being drilled. Secure the workpiece before drilling to prevent rotation or movement. Use cutting fluid when drilling ferrous metals to extend bit life and improve cut quality. Follow applicable workplace safety standards and wear appropriate eye protection during all drilling operations.