Precision Twist Drill 5997802 Jobber Drill Bit 43 Cobalt

Product Description

The PRECISION TWIST DRILL 5997802 is a cobalt high-speed steel jobber-length drill bit sized to wire gauge 43, equal to 0.0890 inches in diameter. It features a 135-degree split point with web thinning for fast engagement and reduced walking on hard materials. The straw oxide finish provides a measure of heat resistance during continuous drilling operations. With a 2-flute regular spiral flute design and straight shank, this bit is suited for production drilling in steel, stainless, cast iron, non-ferrous metals, and high-temp alloys. It meets NAS 907 and ANSI standards, making it appropriate for aerospace and precision machining environments.

This bit is designed for drilling steel and a broad range of workpiece materials including ferrous metals, cast materials, non-ferrous alloys, and special alloys. The 14xD flute-to-diameter ratio delivers efficient chip evacuation in jobber-depth holes. Typical use cases include maintenance and repair operations, production line drilling, and toolroom work where a general-purpose cobalt bit is required. It is sold individually but must be ordered in multiples of 12.

Key Features

• Wire gauge 43 diameter, 0.0890 inches, for precision small-diameter drilling
• 135-degree split point with web thinning reduces thrust and prevents walking
• Cobalt construction for improved heat and wear resistance versus standard HSS
• Straw oxide coating adds surface hardness and mild lubricity
• Regular spiral, 2-flute design promotes consistent chip removal
• Meets NAS 907 and ANSI specifications for aerospace-grade dimensional accuracy

Compatibility

Part of the Series R10CO-R15CO-R18CO cobalt jobber drill line. Designed as a general-purpose replacement or production drill for applications requiring NAS 907-compliant wire-gauge cobalt bits in straight-shank drill chucks.

Installation Notes

Install in a drill press, CNC machining center, or hand drill with a matching straight-shank chuck rated for the spindle speed appropriate to the workpiece material. Secure the shank fully in the chuck before operation to prevent runout. When drilling steel or hard alloys, use a cutting fluid to extend tool life and control heat buildup. Inspect the cutting edges before each use and replace any bit showing chipping or heat discoloration at the tip.