Precision Twist Drill 5997822 No. 73 Cobalt Jobber Drill

Product Description

The PRECISION TWIST DRILL 5997822 is a wire-gauge cobalt jobber-length drill bit sized at No. 73 (0.0240 inches decimal equivalent). Built from cobalt high-speed steel with an oxide and straw coating, this bit delivers added heat resistance and lubricity during cutting. The 135-degree split point geometry reduces walking on entry and lowers thrust force compared to a conventional 118-degree point. The web-thinned, tapered-web design further reduces cutting resistance. Overall length is 1.125 inches, with a 0.3125-inch flute length and a 0.8125-inch straight cylindrical shank. It meets NAS 907 and ANSI standards, making it a recognized choice for controlled, precision drilling in metalworking applications.

This bit is suited for general-purpose drilling in steel, cast iron, aluminum, non-ferrous metals, and high-temp alloys — covering primary workpiece material codes P, M, K, N, and S. Its compact 1.125-inch overall length makes it appropriate for close-tolerance or confined drilling operations where a standard jobber bit would extend too far. Machinists, tool and die technicians, and maintenance mechanics working on precision components typically reach for wire-gauge cobalt bits in this size range. The regular spiral flute geometry provides good chip evacuation at the drilling depths this diameter supports.

Key Features

• Cobalt high-speed steel construction for elevated heat and wear resistance compared to standard HSS
• 135-degree split point reduces drill walk and lowers entry thrust force
• Oxide and straw coating improves lubricity and protects against corrosion during storage
• Web-thinned tapered web reduces cutting resistance and chip packing at depth
• Right-hand cutting, regular spiral flute with 13xD flute-to-diameter ratio
• Meets NAS 907 and ANSI standards for dimensional and performance consistency

Compatibility

Part of the PRECISION TWIST DRILL Series R10CO-R15CO-R18CO cobalt jobber drill line. Designed for general-purpose metal drilling applications where a No. 73 wire-gauge hole is required. Compatible with standard drill presses, CNC machining centers, and hand-held drills accepting a straight cylindrical shank of 0.0240 inches diameter.

Installation Notes

Installation of this drill bit is performed by machinists or maintenance technicians using drill presses, lathes, or CNC equipment. Secure the shank firmly in a collet or chuck before operation and confirm runout is within acceptable limits for the application. Use appropriate cutting fluid or coolant for steel and high-temp alloy materials to extend tool life, noting that this bit does not feature through-coolant capability. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.