Precision Twist Drill 5997730 Cobalt Jobber Drill No. 41

Product Description

The PRECISION TWIST DRILL 5997730 is a No. 41 wire gauge cobalt jobber-length drill bit designed for heavy-duty drilling in steel and other demanding materials. The 135-degree split point starts on contact without a center punch, reducing walking and improving hole location accuracy. A straw oxide finish provides added lubricity and heat resistance during high-speed drilling operations. At 2.375 inches overall length with a 1.375-inch flute length, this bit is sized for compact drilling setups and production drilling in tight clearances. Machinists, tool-and-die makers, and maintenance mechanics are the primary users of this style bit.

This bit is suited for drilling steel, cast iron, non-ferrous metals, and similar materials in both production and maintenance applications. The cobalt construction makes it a step up from standard HSS where elevated cutting temperatures or work-hardened materials are a concern. The straight cylindrical shank accepts standard drill chucks without modification. The Series R10CO-R15CO-R18CO designation identifies the product family within the PRECISION TWIST DRILL cobalt jobber line.

Key Features

• No. 41 wire gauge size, 0.0960-inch decimal equivalent
• Cobalt construction rated for heavy-duty grade service in steel and hard materials
• 135-degree split point for self-centering start and reduced thrust
• Web-thinned tapered web for improved chip clearance and cutting efficiency
• Straw oxide finish for enhanced lubricity and heat resistance
• Regular spiral, 2-flute design with straight cylindrical shank
• NAS 907 and ANSI standards compliance

Compatibility

Designed as an OEM-style jobber drill bit for use in standard drill chucks accommodating a 0.0960-inch straight shank. Part of the R10CO-R15CO-R18CO series. Compatible with workpiece material codes P, M, K, N, and S per the manufacturer designation.

Installation Notes

This bit is installed and changed by machinists or maintenance technicians using a standard drill chuck or collet system. Always ensure the chuck is fully tightened and the spindle is stopped before changing bits. Use appropriate cutting fluid when drilling steel to extend tool life and maintain hole quality. Cobalt bits can withstand higher heat than standard HSS but should not be run dry in hard or work-hardened materials.