Precision Twist Drill 6001443 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001443 is a high speed steel aircraft extension drill bit designed for deep-hole drilling applications where standard-length bits cannot reach. Built to Series 501-6 specifications, it features a 135-degree split point that is self-centering and eliminates the need for a center punch on most materials. The 0.209 inch diameter matches Wire Size 4 and is ground with a straight cylindrical shank of the same diameter for positive chuck grip. The oxide finish provides light corrosion resistance during storage and use. Licensed tradespeople and aerospace MRO technicians use this bit for drilling through structural members, bulkheads, and assemblies requiring extended reach.

This drill bit is suited for general-purpose drilling in ferrous and non-ferrous metals, plastics, and composite materials where a 4xD flute-length-to-diameter ratio is required for chip clearance at depth. The 2.5 inch flute length and 6 inch overall length make it a practical choice for aircraft maintenance, HVAC sheet metal work, and structural steel fabrication where access is limited. Right-hand cutting direction is standard for conventional drill presses, hand drills, and drill motors.

Key Features

• 135-degree split point is self-centering and reduces walking on hard surfaces
• Web-thinned tapered web improves chip evacuation and reduces thrust force
• 0.209 inch diameter ground to Wire Size 4 for precise fitment
• 6 inch overall length with 2.5 inch flute length for extended-reach drilling
• High speed steel construction handles general-purpose metal drilling
• Oxide finish provides light surface protection
• Meets NAS 907 Type B standards

Compatibility

Designed as an OEM-style aircraft extension drill bit conforming to NAS 907 Type B. Compatible with any standard drill chuck accepting a 0.209 inch straight cylindrical shank.

Installation Notes

This bit is installed and used by machinists, aviation mechanics, HVAC sheet metal technicians, and general metalworkers. Secure the shank firmly in the drill chuck before use and verify the workpiece is clamped or fixtured to prevent movement. Use appropriate cutting fluid for ferrous metals to extend bit life and improve hole quality. Inspect the cutting edges and split point for wear or chipping before each use and replace the bit if damage is observed.