Precision Twist Drill 6001342 Letter W Aircraft Drill Bit

Product Description

The PRECISION TWIST DRILL 6001342 is a Letter W aircraft extension drill bit designed for deep-reach drilling applications in metal fabrication, aerospace maintenance, and structural assembly work. Built from high speed steel (HSS) with an oxide finish, this bit features a 135-degree split point that is self-centering and web-thinned, reducing walking on entry and lowering the push force needed to start a hole. The straight-cylindrical shank measures 0.386 inches in diameter, matching the Letter W drill size. With a flute length of 3.75 inches and an overall length of 6 inches, this bit reaches into recessed areas that standard-length bits cannot access. Licensed machinists, aircraft mechanics, and metal fabrication technicians are the primary users of this tool.

This drill bit is suited for right-hand cutting in ferrous and non-ferrous metals where extended reach is required. The Series 502-6 designation identifies it within the PRECISION TWIST DRILL aircraft extension line. General-purpose tool performance makes it appropriate for production drilling, MRO work, and field repair scenarios where a Letter W hole diameter (0.386 inches decimal equivalent) is called out on a drawing or required for a specific fastener clearance. The 4xD flute-length-to-diameter ratio supports chip evacuation in moderate-depth holes without packing.

Key Features

• Letter W drill size with 0.386 inch decimal equivalent diameter
• 135-degree split point with self-centering geometry reduces walking and lowers entry force
• Web-thinned, tapered web construction improves cutting efficiency and chip flow
• 3.75 inch spiral flute length provides extended reach for deep or recessed drilling
• High speed steel construction with oxide finish for durability in general-purpose metal drilling
• Straight-cylindrical shank compatible with standard drill chucks and extension holders
• Meets NAS 907 Type B standard

Compatibility

Designed as an OEM-style replacement or direct-use aircraft extension drill bit for applications requiring a Letter W (0.386 inch) diameter hole and conforming to NAS 907 Type B standards.

Installation Notes

Install in a keyed or keyless drill chuck rated for the shank diameter before powering the drill. Always secure the workpiece and wear appropriate eye protection when drilling metal. Ensure cutting speed and feed rate are appropriate for the material being drilled to avoid premature wear or work hardening. Power down the drill completely before changing or inspecting the bit.