Precision Twist Drill 5995854 Cobalt Drill Bit 7/64 in

Product Description

The PRECISION TWIST DRILL 5995854 is a cobalt aircraft extension drill bit designed for demanding drilling applications in hard and abrasive materials. Built to Series CO500-6 specifications and compliant with NAS 907 Type J standards, this bit features a 135-degree split point with self-centering geometry that eliminates the need for a center punch and reduces walking on entry. The straw finish indicates a heat-treatment process that supports elevated hardness and thermal resistance. At 7/64 inch (0.1094 inch) diameter with a 1.5-inch flute length and 6-inch overall length, it is sized for reaching into recessed or deep-clearance locations that standard-length bits cannot access. Two right-hand spiral flutes with a web-thinned, tapered web configuration promote chip evacuation and reduce thrust during cutting.

This bit is suited for use in aerospace, fabrication, and maintenance applications where extended reach and material hardness demand a cobalt construction over standard high-speed steel. The CO500-6 series is a general-purpose aircraft extension format commonly used by machinists, sheet metal workers, and maintenance technicians drilling stainless steel, titanium alloys, hardened steels, and similar difficult-to-machine materials. The straight-cylindrical shank seats in standard drill chucks without modification.

Key Features

• Cobalt tool material for superior hardness and heat resistance compared to standard HSS
• 135-degree split point with self-centering geometry reduces walking and center-punch dependency
• 6-inch overall length provides extended reach for recessed and deep-clearance drilling locations
• Web-thinned, tapered web reduces cutting thrust and improves chip flow
• Straw finish indicates heat-treated hardness appropriate for hard and abrasive materials
• NAS 907 Type J compliant for aerospace and precision fabrication standards

Compatibility

Designed as an OEM-style general-purpose aircraft extension drill bit compatible with standard drill chucks accepting a straight-cylindrical shank at 7/64 inch (0.1094 inch) diameter.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians familiar with metalworking operations. Secure the straight-cylindrical shank fully into a properly rated drill chuck before operation, and verify chuck key is removed before powering the tool. Use appropriate cutting fluid or lubricant when drilling hard alloys to extend bit life and maintain dimensional accuracy. Follow applicable shop safety standards and wear appropriate personal protective equipment including eye protection.