Precision Twist Drill 6001477 No. 20 Hss Aircraft Drill

Product Description

The PRECISION TWIST DRILL 6001477 is a No. 20 wire-size aircraft extension drill bit engineered for deep-reach drilling in aerospace and structural metalworking applications. Built from high-speed steel with an oxide finish, this bit delivers reliable performance in general-purpose metal drilling where standard-length bits cannot reach. The 135-degree split point geometry is self-centering and web-thinned, eliminating the need for a center punch on most surfaces and reducing walking on entry. At 0.161 inches in diameter with a 2.125-inch spiral flute length and 6-inch overall length, it provides a 4xD flute-to-diameter ratio suited for chip evacuation in deeper bores.

This drill bit is designed for use in aircraft structural repair, sheet metal fabrication, and general industrial drilling operations where extended reach is required. It is well suited for drilling aluminum, mild steel, and similar materials encountered in aerospace maintenance and manufacturing environments. The straight-cylindrical shank accommodates standard drill chucks, making it compatible with both handheld and stationary drilling equipment commonly used by aviation mechanics, machinists, and metalworking tradespeople.

Key Features

• No. 20 wire size, 0.161-inch diameter for precision close-tolerance drilling
• 135-degree split point is self-centering and reduces walking on entry
• Web-thinned with tapered web configuration for improved chip flow
• High-speed steel construction with oxide finish for general-purpose metal cutting
• 6-inch overall length provides extended reach for aircraft and structural applications
• Right-hand cutting, two-flute spiral design for efficient material removal
• Meets NAS 907 Type B standard

Compatibility

Designed as an OEM-style replacement or direct application drill bit for Series 501-6 aircraft extension drill applications requiring a No. 20 wire-size bit with a straight-cylindrical shank and 135-degree split point geometry.

Installation Notes

Installation of this bit should be performed by qualified machinists, aviation mechanics, or metalworking tradespeople familiar with drill press or handheld pneumatic and electric drilling equipment. Ensure the drill chuck is properly tightened and the workpiece is securely clamped before operation. Use appropriate cutting fluid for the material being drilled to extend bit life and improve hole quality. Follow applicable workplace safety standards and aviation maintenance regulations when performing structural drilling.