Precision Twist Drill 6001353 21/64 in Hss Extension Drill

Product Description

The PRECISION TWIST DRILL 6001353 is a high speed steel aircraft extension drill bit designed for deep-reach drilling applications where standard-length bits cannot access the work area. Built to Series 500-12 specifications and compliant with NAS 907 Type B standards, this bit features a 135-degree split point that self-centers on contact, eliminating the need for a center punch on most materials. The oxide finish provides a degree of lubricity and corrosion resistance during service. At 21/64 inch (0.3281 inch decimal) diameter with a 12-inch overall length, it delivers extended reach without sacrificing rigidity. Licensed HVAC technicians, aircraft sheet metal workers, electricians, and plumbers install this bit when working through structural members or access-restricted cavities.

This extension drill bit is suited for through-drilling in metal, wood, and composite materials where standard flute lengths are insufficient. The 3-5/16 inch (3.3125 inch decimal) spiral flute length provides adequate chip clearance during extended-reach operations. The straight-cylindrical shank seats in standard drill chucks without adapters, making it compatible with corded, cordless, and right-angle drill motors commonly used on commercial and residential jobsites. General-purpose tool performance rating makes it appropriate for repetitive production drilling as well as field service work.

Key Features

• 135-degree split point with self-centering geometry reduces walking and eliminates center-punch setup on most materials
• 12-inch overall length provides extended reach into deep cavities, structural bays, and framing members
• High speed steel construction maintains cutting edge integrity across a broad range of base metals and composites
• Web-thinned tapered web reduces thrust force required at the drill press or hand drill
• Oxide finish improves surface lubricity and offers basic corrosion resistance during storage and use
• Complies with NAS 907 Type B standards for aircraft-grade drilling applications

Compatibility

Designed as a general-purpose aircraft extension drill bit with a straight-cylindrical shank compatible with standard 3/8-inch and 1/2-inch drill chucks. Meets NAS 907 Type B dimensional standards.

Installation Notes

Install and remove this bit with the drill motor fully powered off and the chuck key removed from the work area. Secure the shank fully in the chuck jaws to minimize runout over the extended length. Use cutting fluid or lubricant when drilling ferrous metals to extend bit life and reduce heat buildup. Follow applicable OSHA and jobsite safety requirements when operating extended-length tooling in confined or overhead positions.