Precision Twist Drill 5996060 Cobalt Aircraft Drill Bit

Product Description

The PRECISION TWIST DRILL 5996060 is a cobalt steel aircraft extension drill bit designed for drilling hard and abrasion-resistant materials in aerospace and general metalworking applications. Ground to a No. 35 wire gauge size with a decimal diameter of 0.110 inches, this bit features a 135-degree split point for self-centering entry without a center punch. The straw finish indicates heat-treated cobalt construction. A 1.5-inch spiral flute length and 6-inch overall length give it the extended reach needed in tight or deep-access drilling situations. It is installed by machinists, aviation maintenance technicians, and metalworking tradespeople working to NAS 907 Type J standards.

This drill bit is suited for use in aircraft structural repair, sheet metal fabrication, and precision metalworking where hard-material penetration and accurate hole placement are required. The extended 6-inch overall length accommodates drilling in recessed areas or through stacked material. The two-flute spiral design and web-thinned, tapered web construction promote efficient chip evacuation and reduced feed force. General-purpose tool performance makes it a practical choice for production and maintenance shops working with steel, stainless steel, titanium, and other high-strength alloys.

Key Features

• Cobalt tool material with straw finish for improved heat and wear resistance in hard metals
• 135-degree split point is self-centering and reduces walking on hard or curved surfaces
• Web-thinned tapered web lowers thrust requirements and supports chip clearance
• Extended 6-inch overall length provides reach in confined or deep drilling locations
• Right-hand cutting, two-flute spiral design for standard drill press and hand-drill use
• Meets NAS 907 Type J standard for aircraft drill bit dimensional and performance requirements

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for applications requiring a No. 35 wire size cobalt aircraft extension drill conforming to NAS 907 Type J. Part of the PRECISION TWIST DRILL Series CO501-6.

Installation Notes

This drill bit is installed and operated by machinists, aviation maintenance technicians, and sheet metal tradespeople. Secure the workpiece firmly before drilling and use appropriate cutting fluid or lubricant when working with stainless steel, titanium, or other hard alloys to extend tool life. Operate at the correct surface footage for the material being drilled — running cobalt bits too fast in hard materials accelerates edge wear. Inspect the split point for chipping or wear before each use.