Precision Twist Drill 5996147 Cobalt Aircraft Drill Bit

Product Description

The PRECISION TWIST DRILL 5996147 is a cobalt aircraft extension drill bit designed for drilling in hard and tough materials where standard high-speed steel bits fall short. It carries a wire gauge size of 14, which corresponds to a decimal diameter of 0.182 inches, and an overall length of 6 inches with a flute length of 2.1875 inches. The straw finish indicates a heat-treated cobalt construction suited for elevated cutting temperatures. The 135-degree split point with web thinning allows self-centering entry without a center punch, reducing setup time on the shop floor or in the field. Machinists, aircraft maintenance technicians, and metalworking tradespeople are the primary installers of this bit.

This drill bit is built for general-purpose metal drilling applications where extended reach is required, including structural steel, stainless steel, aluminum, and aerospace-grade alloys. The 6-inch overall length makes it appropriate for aircraft maintenance, sheet metal fabrication, and structural drilling tasks where a standard-length bit cannot reach the work surface. It conforms to NAS 907 Type J standards, making it a recognized fit for aerospace and defense maintenance applications. The right-hand spiral flute configuration supports standard drilling machines and handheld electric drills.

Key Features

• Cobalt tool material provides heat resistance for drilling hard metals and alloys
• 135-degree split point with web thinning enables self-centering without a center punch
• Straw finish indicates cobalt construction hardened for extended tool life at elevated temperatures
• Extended 6-inch overall length delivers reach into recessed or deep structural locations
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets NAS 907 Type J standards for aerospace and structural applications

Compatibility

Designed as a general-purpose replacement or service drill bit for use in standard three-jaw drill chucks accepting a 0.182-inch straight-cylindrical shank, compatible with handheld drills and drill presses used in metalworking and aircraft maintenance.

Installation Notes

This bit is installed by machinists, aircraft maintenance technicians, and metal fabricators using standard drill chucks. Secure the straight-cylindrical shank firmly in the chuck before drilling and verify spindle speed is appropriate for the workpiece material and bit diameter. Do not exceed the recommended feed rate for cobalt bits in hard alloys, as excessive pressure can cause tip fracture. Eye protection and appropriate machine guarding should be in place during all drilling operations.