Precision Twist Drill 5996077 Cobalt Drill Bit 0.1015 in

Product Description

The PRECISION TWIST DRILL 5996077 is a cobalt aircraft extension drill bit designed for drilling in hard metals, stainless steel, and high-temperature alloys where standard HSS tooling wears prematurely. Built to Series CO501-6 specifications, this bit carries a wire size designation of 38, corresponding to a decimal diameter of 0.1015 inches. The 135-degree split point is self-centering and web-thinned, eliminating the need for a center punch on most ferrous surfaces and reducing walking on entry. The straw finish indicates a heat-treated cobalt substrate appropriate for production and maintenance drilling in demanding shop and field environments. Licensed trades and aerospace maintenance technicians are the primary installers of this tooling.

This drill bit is suited for use in aircraft maintenance, structural fabrication, and general metalworking applications where a 6-inch overall length is needed to reach recessed or deep-set hole locations. The extended length makes it practical for drilling through structural members, tubing walls, and stacked material where a jobber-length bit cannot reach. The right-hand spiral flute geometry evacuates chips efficiently in through-hole and blind-hole applications across a range of metal stock.

Key Features

• Cobalt tool material withstands elevated heat in hard-metal and stainless drilling applications
• 135-degree split point with web thinning provides self-centering entry without a pilot hole
• 0.1015 inch diameter, wire size 38, straight-cylindrical shank fits standard chucks without reduction
• 6-inch overall length with 1.4375-inch flute length accommodates extended-reach drilling
• Right-hand cutting direction with 2-flute spiral geometry for efficient chip evacuation
• Meets NAS 907 Type J standard for aircraft-grade drilling performance

Compatibility

Designed as an OEM-style replacement and general-purpose option for applications requiring a wire size 38 cobalt extension drill bit conforming to NAS 907 Type J in Series CO501-6.

Installation Notes

This tooling is installed and used by machinists, aircraft maintenance technicians, and metalworking trade professionals. Secure the straight-cylindrical shank firmly in a keyed or keyless chuck rated for the intended spindle speed before operation. Power down and lock out all equipment before changing tooling. Follow applicable shop safety standards and manufacturer speed-and-feed recommendations for the specific base material being drilled.