Precision Twist Drill 5997831 Cobalt Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5997831 is a cobalt jobber-length drill bit in wire size 76, equivalent to 0.0200 inches in diameter. It features a 135-degree split-point tip with web thinning for reduced walking and faster penetration on hard and tough materials. The straw oxide finish provides light lubricity and corrosion resistance during use. With a regular spiral flute design and straight cylindrical shank, this bit is built for general-purpose drilling in steel, stainless, cast iron, aluminum, and other metals. It carries a heavy-duty grade rating and meets ANSI and NAS 907 standards. Licensed trade machinists and industrial maintenance technicians are the primary users of bits in this size class.

This drill bit is intended for precision drilling applications where small-diameter accuracy is critical. The 0.1875-inch flute length supports shallow-hole work in a wide range of workpiece materials including steel, cast iron, nonferrous metals, and certain composites, as indicated by the P, M, K, N, and S material codes. The 7/8-inch overall length and straight shank suit standard drill chucks and precision collet holders used in drill presses, CNC machining centers, and hand-held power tools in production and maintenance environments.

Key Features

• Wire size 76 diameter of 0.0200 inches suits precision small-hole applications
• 135-degree split point with web thinning reduces thrust force and minimizes walking
• Cobalt high-speed steel construction handles elevated cutting temperatures on hard metals
• Straw oxide coating adds surface lubricity and light corrosion protection
• Regular spiral flute geometry provides efficient chip evacuation in shallow holes
• Meets ANSI and NAS 907 specifications for dimensional and performance consistency

Compatibility

Designed as a general-purpose replacement or production drill bit compatible with standard straight-shank drill chucks and collet systems accepting a 0.0200-inch shank diameter. Part of the R10CO-R15CO-R18CO series by PRECISION TWIST DRILL.

Installation Notes

This bit should be installed and operated by qualified machinists or maintenance technicians familiar with small-diameter tooling. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits, as small-diameter cobalt bits are sensitive to misalignment. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole quality. Do not exceed the recommended maximum drilling depth of 0.1875 inches for a single pass without retracting to clear chips.