Precision Twist Drill 6001231 Aircraft Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 6001231 is a high speed steel aircraft extension drill bit designed for extended-reach drilling in aerospace and general metal fabrication applications. Built to NAS 907 Type B standards, it features a 135-degree split point that is self-centering and web-thinned for fast penetration without the need for a center punch. The 0.191-inch diameter straight-cylindrical shank fits standard drill chucks, and the two-flute spiral configuration clears chips efficiently. At 12 inches overall length with a 2.3125-inch flute length, this bit is built for reaching into tight or deep cavities that standard-length drills cannot access. Licensed HVAC techs, sheet metal workers, and aviation maintenance technicians are the primary users.

This drill bit is suited for right-hand cutting in metal substrates including steel and aluminum. The oxide finish provides a degree of lubricity and surface protection during drilling operations. The 4xD flute-to-diameter ratio and tapered web configuration make it appropriate for general-purpose production drilling in both shop and field environments. The aircraft extension length is particularly useful when drilling through structural panels, ductwork flanges, or any application where standard jobber-length bits fall short.

Key Features

• 135-degree split point with web thinning for self-centering starts on metal surfaces
• High speed steel construction rated for general-purpose metal drilling
• 12-inch overall length for extended-reach applications
• 0.191-inch diameter matches wire gauge size 11
• Oxide finish for surface protection and reduced friction
• NAS 907 Type B compliant construction

Compatibility

Designed as a general-purpose aircraft extension drill bit in Series 501-12, compatible with standard drill chucks accepting a 0.191-inch straight-cylindrical shank, for use in metal drilling operations requiring extended reach.

Installation Notes

Install and remove this bit with the drill unplugged or the tool locked out per OSHA lockout/tagout procedures. Secure the straight-cylindrical shank firmly in the chuck before operation to prevent slippage. Use appropriate cutting fluid when drilling ferrous metals to extend bit life and improve cut quality. Wear eye protection and secure the workpiece before drilling.