Precision Twist Drill 5997703 No. 18 Cobalt Jobber Drill

Product Description

The PRECISION TWIST DRILL 5997703 is a No. 18 wire-gauge cobalt jobber-length drill bit engineered for heavy-duty drilling in ferrous and non-ferrous metals. Ground to a 135-degree split point with web thinning, it starts on contact without walking and reduces thrust force compared to standard 118-degree points. The bit is manufactured from cobalt high-speed steel with a straw oxide finish for added heat resistance. Overall length is 3.25 inches with a 2.125-inch flute length, and the straight shank diameter measures 0.1695 inches. It belongs to the PRECISION TWIST DRILL R10CO-R15CO-R18CO series and meets ANSI and NAS 907 standards. Licensed tradespeople and machinists use this bit in production and maintenance drilling applications.

This bit is rated for drilling steel, stainless, cast iron, aluminum, and other materials across workpiece material codes P, M, K, N, and S. Its 13xD flute-to-diameter ratio provides efficient chip evacuation in moderate-depth holes up to 2.125 inches. The two-flute regular spiral design suits general-purpose drilling in both handheld and drill-press setups. It is sold individually and is a direct fit for applications requiring a No. 18 wire gauge size at 0.1695 inches decimal diameter.

Key Features

• Cobalt HSS construction for elevated heat resistance in hard and abrasive materials
• 135-degree split point with web thinning for self-centering starts and reduced thrust
• Straw oxide finish improves lubricity and surface hardness at the cutting edge
• Straight cylindrical shank at 0.1695 inches fits standard drill chucks without adapters
• Two-flute regular spiral geometry evacuates chips efficiently in general-purpose drilling
• Meets ANSI and NAS 907 standards; heavy-duty grade for demanding production use

Compatibility

Designed as an OEM-style replacement or direct-use cobalt jobber drill bit for applications requiring a No. 18 wire gauge size (0.1695 inches decimal). Part of the PRECISION TWIST DRILL R10CO-R15CO-R18CO series.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard three-jaw drill chucks or collet systems rated for straight-shank tooling. Secure the shank fully in the chuck before operation and verify runout before drilling into finished surfaces. Use cutting fluid appropriate for the workpiece material to extend edge life, particularly when drilling steel or stainless. Do not exceed the recommended drilling depth of 2.125 inches without withdrawing to clear chips.