Precision Twist Drill 5995802 Cobalt Drill Bit 7/64 in

Product Description

The PRECISION TWIST DRILL 5995802 is a cobalt aircraft extension drill bit designed for demanding drilling applications in hard metals and alloys. Built to Series CO500-12 standards, this bit features a 135-degree split point for self-centering entry without a center punch, reducing walking on hard or coated surfaces. The straw finish indicates heat-treated cobalt steel construction, which provides greater red-hardness and wear resistance compared to standard high-speed steel. With a 12-inch overall length and a 1.5-inch flute length, it reaches deep or recessed locations where standard-length bits cannot. Installed by machinists, aircraft maintenance technicians, and industrial tradespeople working in steel, stainless, titanium, and similar hard materials.

This drill bit is suited for through-hole and spotting operations in aerospace, automotive, and heavy industrial maintenance environments. The extended reach makes it practical for structural drilling on frames, bulkheads, and assemblies where access is restricted. The right-hand spiral flute design evacuates chips efficiently during deep or angled drilling passes. General-purpose tool performance classification means it handles a wide range of ferrous and non-ferrous materials without specialized setup.

Key Features

• 135-degree split point for self-centering entry — no pilot hole required on most materials
• Cobalt construction with straw finish for increased heat and wear resistance
• 12-inch overall length provides extended reach into deep or restricted work areas
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Right-hand spiral flute with tapered web for efficient chip evacuation
• Meets NAS 907 Type J standards for aerospace-grade tooling

Compatibility

Designed as a general-purpose aircraft extension drill bit compatible with standard 3-jaw chucks and collets accepting a straight-cylindrical shank. Conforms to NAS 907 Type J specifications.

Installation Notes

This tool is installed and operated by machinists, aircraft maintenance technicians, and industrial maintenance professionals. Secure the shank firmly in a calibrated chuck or collet before use and verify runout is within acceptable limits. Always match spindle speed and feed rate to the workpiece material and bit diameter per standard machining tables. Inspect the cutting edges before each use and replace the bit if chipping, dulling, or heat discoloration beyond the straw zone is observed.