Precision Twist Drill 5995767 Cobalt Aircraft Drill 11/64

Product Description

The PRECISION TWIST DRILL 5995767 is a cobalt aircraft extension drill bit designed for drilling in hard, abrasion-resistant materials where standard high-speed steel bits fall short. It measures 11/64 inch (0.1719 inch) in diameter with a 2.125-inch flute length and a 12-inch overall length, giving technicians the reach needed for deep or obstructed holes. The 135-degree split point is self-centering, which eliminates the need for a center punch and reduces walking on hard or curved surfaces. A straw finish indicates the cobalt heat treatment and provides light corrosion resistance. This drill is part of the Series CO500-12 lineup and is suited for use by machinists, aircraft maintenance technicians, and industrial tradespeople.

The 5995767 is engineered for general-purpose drilling in aerospace-grade alloys, stainless steel, cast iron, and other hard metals. Its 12-inch extension length makes it practical for reaching into tight structural assemblies, body panels, or framing members where a standard-length bit cannot reach. The right-hand spiral flute design efficiently clears chips during drilling. It is commonly used in aircraft maintenance, shipbuilding, heavy equipment fabrication, and similar trades requiring extended reach in hard materials.

Key Features

• Cobalt construction provides heat and wear resistance for drilling hard metals and alloys
• 135-degree split point is self-centering and reduces bit walking on hard surfaces
• 12-inch overall length offers extended reach for deep or obstructed drilling applications
• Straw finish indicates cobalt heat treatment and adds light corrosion resistance
• Straight-cylindrical shank compatible with standard drill chucks
• Web-thinned, tapered web configuration reduces thrust and improves cutting efficiency
• Meets NAS 907 Type J standards for aircraft-grade tooling

Compatibility

Designed as an OEM-style aircraft extension drill bit in Series CO500-12, suitable for use in standard drill chucks accepting straight-cylindrical shanks at 11/64 inch (0.1719 inch) diameter. Conforms to NAS 907 Type J standards.

Installation Notes

This drill bit is installed by machinists and maintenance technicians using standard keyed or keyless drill chucks rated for the 11/64-inch straight shank. Ensure the workpiece is securely clamped before drilling. Use appropriate cutting fluid when drilling stainless steel or high-strength alloys to extend tool life and manage heat buildup. Inspect the split point for wear or chipping before each use, as a damaged point will reduce self-centering performance and hole accuracy.