Precision Twist Drill 6001284 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001284 is a Letter E (0.2500 inch) aircraft extension drill bit engineered for reach-critical drilling applications in metal fabrication, aerospace maintenance, and industrial assembly work. Built from high speed steel with an oxide finish, this bit features a 135-degree split point that self-centers on contact and reduces the need for a center punch. The spiral flute design runs 2.75 inches along a 6-inch overall length, giving technicians and machinists the extended reach needed to access recessed or confined bore locations. Installation and use require no special tooling beyond a standard straight-shank chuck.

This bit is suited for general-purpose drilling in steel, aluminum, and similar metals where a standard-length bit cannot reach. The 6-inch overall length makes it a practical choice for drilling through structural members, bulkheads, or stacked assemblies in automotive, aerospace, and industrial maintenance environments. The straight cylindrical shank accepts most standard drill chucks. Right-hand cutting direction is standard for conventional drill press and hand-drill use.

Key Features

• Letter E (0.2500 inch) diameter with matching 1/4-inch straight cylindrical shank
• 135-degree split point with web thinning for self-centering and reduced feed pressure
• High speed steel construction with oxide finish for wear resistance
• 2.75-inch spiral flute length provides efficient chip evacuation
• 6-inch overall length for extended reach into confined or deep bore locations
• Meets NAS 907 Type B standard; tapered web configuration for added rigidity

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with any standard drill chuck accepting a 1/4-inch straight cylindrical shank, including hand drills, drill presses, and right-angle drill attachments used in metal fabrication and aerospace maintenance applications.

Installation Notes

Secure the straight shank firmly in a properly sized drill chuck before use and verify the bit runs true with no visible wobble. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend tool life and maintain hole quality. Always wear eye protection and secure the workpiece to prevent rotation. Inspect the cutting edges before each use and remove the bit from service if chipping or excessive wear is observed.