Precision Twist Drill 6001234 Aircraft Extension Drill Bit

Product Description

The PRECISION TWIST DRILL 6001234 is a high speed steel aircraft extension drill bit designed for precision drilling in metal, aerospace components, and structural materials. Built to Wire Size 13 (0.185 inches diameter), it features a 135-degree split point that is self-centering and web-thinned, reducing walking on entry and lowering thrust required to start a hole. The spiral flute geometry and oxide finish make it well suited for general-purpose drilling in ferrous metals and alloys. The straight-cylindrical shank seats securely in standard drill chucks. This bit is sold individually and is appropriate for use by machinists, aircraft maintenance technicians, and metalworking tradespeople.

This aircraft extension drill bit is used wherever a standard-length bit cannot reach — deep cavities, recessed fastener locations, and structural assemblies in aerospace, HVAC sheet metal fabrication, and general metalworking. The extended overall length of 12 inches provides the additional reach needed in confined or deep-access applications. The Series 501-12 designation identifies it as part of a standardized aircraft drill family meeting NAS 907 Type B specifications, which governs drill geometry and dimensional tolerances for aerospace-grade tooling.

Key Features

• Wire Size 13 diameter (0.185 inches) for precise hole sizing in metal fabrication and aerospace work
• 135-degree split point with web thinning for self-centering entry and reduced thrust
• 12-inch overall length provides extended reach into deep or confined work areas
• High speed steel construction handles ferrous metals and general-purpose drilling applications
• Oxide coating improves lubricity and surface hardness for extended tool life
• Meets NAS 907 Type B standards for aircraft-grade drill geometry and dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct drop-in for Series 501-12 aircraft extension drill applications requiring a Wire Size 13 straight-shank bit meeting NAS 907 Type B specifications.

Installation Notes

Install in a standard drill chuck sized for a 0.185-inch straight-cylindrical shank and verify chuck jaw engagement before operation. Use appropriate cutting fluid for the material being drilled to extend bit life and maintain hole quality. Follow applicable shop safety protocols and relevant aerospace maintenance standards when working on aircraft structure. Inspect the cutting edges and split point for wear before each use and replace the bit if the point shows chipping or dulling.