Precision Twist Drill 6001339 Letter V Aircraft Drill Bit

Product Description

The PRECISION TWIST DRILL 6001339 is a Letter V aircraft extension drill bit engineered for deep-hole drilling in aerospace, structural, and industrial applications. Built from high speed steel (HSS) with an oxide finish, it features a 135-degree split point that is self-centering and reduces the need for a center punch on most materials. The straight-cylindrical shank measures 0.377 inches in diameter, and the spiral flute length runs 3.625 inches, giving a flute-to-diameter ratio of 4xD. Web thinning with a tapered web configuration reduces thrust and improves chip evacuation in extended-reach setups.

This drill bit is suited for use in aerospace maintenance, aircraft structural repair, and general metalworking where extended reach is required. The 6-inch overall length makes it appropriate for drilling through stacked materials, deep cavities, or assemblies where a standard-length bit cannot reach the work surface. It conforms to NAS 907 Type B standards, which makes it a fit for aerospace MRO environments. General-purpose tool performance rating makes it equally usable in fabrication shops and maintenance facilities outside of aerospace work.

Key Features

• 135-degree split point is self-centering and eliminates walking on flat metal surfaces
• High speed steel construction provides hardness and toughness for drilling steel, aluminum, and similar metals
• Oxide finish improves lubricity and provides light corrosion resistance during storage and use
• 3.625-inch flute length with 4xD ratio supports chip clearing in extended-depth holes
• Web-thinned tapered web reduces axial thrust and eases penetration
• Right-hand cutting, 2-flute spiral design for standard drill press and handheld drill use
• Meets NAS 907 Type B standard for aerospace drill applications

Compatibility

Designed as an OEM-style replacement or direct-use aircraft extension drill bit conforming to NAS 907 Type B specifications, suitable for use with standard drill chucks accepting a 0.377-inch straight-cylindrical shank.

Installation Notes

This drill bit is installed by machinists, aircraft mechanics, and maintenance technicians using standard drill presses, magnetic drills, or handheld power drills with appropriate chuck capacity. Secure the shank fully in the chuck before beginning any drilling operation and confirm the workpiece is clamped or fixtured to prevent movement. Use cutting fluid appropriate for the workpiece material to extend bit life and improve surface finish. Always wear appropriate eye protection and follow applicable shop safety procedures when operating rotary cutting tools.