Precision Twist Drill 5997875 Cobalt Jobber Drill Bit 46

Product Description

The PRECISION TWIST DRILL 5997875 is a cobalt jobber-length drill bit designed for precision drilling in steel and other demanding materials. Wire size 46 corresponds to a decimal diameter of 0.0810 inches. The 135-degree split point reduces walking and cutting thrust, making it well suited for production drilling where bit positioning and hole quality matter. The two-flute, right-hand spiral configuration provides efficient chip evacuation. An oxide and straw coating adds surface hardness and light lubricity. Overall length is 2.125 inches with a flute length of 1.125 inches. Built to NAS 907 and ANSI standards, this bit is rated heavy duty and meets the demands of repetitive, close-tolerance work.

This bit is intended for drilling steel, cast iron, nonferrous metals, and select superalloys, covering workpiece material codes P, M, K, N, and S. It is a general-purpose, heavy-duty option sized for light-duty machining centers, drill presses, and hand-held drilling operations where a wire-gauge size is called out on the print. The R10CO-R15CO-R18CO series is designed for shops and field technicians who need consistent cobalt-grade performance in fractional and wire-size formats. Sold individually, with a minimum order quantity of 12 units.

Key Features

• Cobalt high-speed steel construction for improved heat and wear resistance in ferrous materials
• 135-degree split point reduces thrust and eliminates the need for a center punch on most metals
• Oxide and straw finish provides light lubricity and corrosion resistance
• Web-thinned, tapered web design reduces cutting resistance and improves chip flow
• Right-hand cut, regular spiral flute with 14xD flute-to-diameter ratio for effective chip clearance
• Meets NAS 907 and ANSI standards for dimensional accuracy and material grade

Compatibility

Designed for use in standard straight-shank drill chucks. Compatible with applications calling for wire size 46 or 0.0810-inch diameter tooling. Suitable for primary workpiece materials designated P, M, K, N, and S per standard material classification. Part of the Precision Twist Drill Series R10CO-R15CO-R18CO.

Installation Notes

Installation is performed by machinists or maintenance technicians using any drill press, CNC machining center, or hand drill equipped with a compatible straight-shank chuck. Secure the shank fully in the chuck and verify runout before production use. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed. Follow applicable shop safety procedures and use appropriate cutting fluid or coolant for the workpiece material when required.