Precision Twist Drill 6001358 Letter C Hss Aircraft Drill

Product Description

The PRECISION TWIST DRILL 6001358 is a high speed steel aircraft extension drill bit sized to Letter C (0.242 inches) with a 135-degree split point and an oxide finish. Designed for deep-reach drilling applications, this bit features a 12-inch overall length and a 2.75-inch spiral flute that provides chip evacuation in extended-depth bores. The self-centering split point eliminates the need for a center punch on most materials, and the web-thinned, tapered web configuration reduces thrust load during entry. Licensed HVAC techs, sheet metal workers, aircraft maintenance technicians, and general metalworking trades rely on this style of drill for access holes in confined or deep structural assemblies.

This drill bit is built for general-purpose metalworking and structural drilling where standard-length bits cannot reach. The 12-inch extension length makes it suited for drilling through framing members, ductwork flanges, bulkheads, and similar deep-clearance applications encountered in HVAC installation, aircraft maintenance, and light industrial fabrication. Series 502-12 designates the extended-length family within Precision Twist Drill's product line. Right-hand cutting direction is standard for use with conventional drill presses and hand-held electric or pneumatic drills.

Key Features

• Letter C size: 0.242-inch diameter for precise fractional sizing in metalwork
• 135-degree split point with self-centering geometry eliminates pilot punch on most metals
• 12-inch overall length provides extended reach in deep or confined drilling scenarios
• High speed steel construction rated for general-purpose ferrous and non-ferrous materials
• Oxide finish for baseline lubricity and corrosion resistance during storage and use
• Web-thinned tapered web reduces thrust and heat buildup at the cutting edge
• NAS 907 Type B compliant for aerospace and aircraft maintenance applications

Compatibility

Designed as a general-purpose aircraft extension drill bit conforming to NAS 907 Type B standards, suitable for use in standard straight-shank drill chucks accepting 0.242-inch diameter shanks on drill presses, hand drills, and pneumatic drilling equipment.

Installation Notes

This drill bit is installed and used by machinists, HVAC sheet metal technicians, aircraft maintenance professionals, and structural trades. Secure the straight-cylindrical shank fully in a compatible drill chuck before operation and verify chuck tightness before drilling. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and control heat. Follow applicable workplace safety standards and wear rated eye protection during all drilling operations.