Precision Twist Drill 6001242 Aircraft Extension Drill

Product Description

The PRECISION TWIST DRILL 6001242 is a high speed steel aircraft extension drill bit designed for deep-reach drilling in aerospace, structural, and general metalworking applications. Built to Series 501-12 standards, it carries a wire gauge size of 18, which corresponds to a decimal diameter of 0.1695 inches. The 135-degree split point is self-centering, eliminating the need for a center punch on most surfaces and reducing walking on entry. An oxide finish provides mild corrosion resistance and helps reduce heat buildup during cutting. Licensed HVAC, aviation maintenance, and industrial technicians rely on this style of drill for extension-reach work where standard-length bits cannot reach the worksite.

This drill bit is suited for through-hole and spot drilling in sheet metal, aluminum, and mild steel in both production shop and field service environments. The 12-inch overall length and 2.125-inch spiral flute section make it well suited for aircraft skin drilling, HVAC cabinet fabrication, and structural panel work where clearance depth is a limiting factor. The straight-cylindrical shank seats directly in standard drill chucks without an adapter. Right-hand cutting direction is compatible with all standard drill drivers and drill presses.

Key Features

• 135-degree split point is self-centering for accurate entry without center-punching
• Wire size 18 diameter (0.1695 inches) for precise hole sizing in sheet metal and structural work
• 12-inch overall length provides extended reach in deep or obstructed drilling locations
• High speed steel construction maintains cutting edge integrity across a wide range of metal substrates
• Oxide finish reduces friction and provides basic protection against surface corrosion
• Web-thinned, tapered web configuration reduces thrust requirement and improves chip evacuation

Compatibility

Designed as an OEM-style replacement or direct-use aircraft extension drill bit for applications requiring NAS 907 Type B compliance in aerospace, structural fabrication, and general-purpose metal drilling.

Installation Notes

Installation should be performed by a qualified machinist, maintenance technician, or trained tradesperson familiar with rotary cutting tools. Secure the straight-cylindrical shank firmly in a keyed or keyless chuck before use and verify concentricity before drilling. Disconnect all power to drill equipment before changing bits. Use appropriate cutting fluid for the work material to extend tool life and maintain hole quality.