Precision Twist Drill 5997804 Cobalt Jobber Drill No 68

Product Description

The PRECISION TWIST DRILL 5997804 is a No. 68 wire size cobalt jobber-length drill bit designed for general-purpose drilling in steel and other demanding workpiece materials. The bit measures 1.375 inches overall with a 0.5 inch flute length and a 0.0312 inch cutting diameter. The 135-degree split point reduces walking and allows the bit to engage material without a center punch in most applications. A straw oxide finish improves lubricity and provides mild corrosion resistance during storage and cutting. This bit is part of the R10CO-R15CO-R18CO series and is built to ANSI and NAS 907 standards, making it a reliable choice for production drilling where consistency matters.

This drill bit is suited for drilling steel, cast iron, aluminum, non-ferrous metals, and high-temperature alloys, covering primary workpiece material codes P, M, K, N, and S. The straight cylindrical shank with a 0.0313 inch shank diameter fits standard drill chucks and collets. Right-hand spiral flutes evacuate chips efficiently in through-hole and blind-hole applications. Typical users include machinists, maintenance mechanics, and industrial production technicians working on precision drilling tasks where a small-diameter cobalt bit is required.

Key Features

• No. 68 wire size, 0.0312 inch cutting diameter for precise small-hole work
• Cobalt construction provides heat resistance for drilling steel and hard alloys
• 135-degree web-thinned split point reduces thrust and minimizes bit walking
• Straw oxide finish improves lubricity and extends tool life in continuous-duty use
• Regular spiral flutes with tapered web design for efficient chip evacuation
• Meets ANSI and NAS 907 specifications for dimensional and performance consistency

Compatibility

Part of the PRECISION TWIST DRILL R10CO-R15CO-R18CO series. Designed for use in standard drill chucks and collets accepting a 0.0313 inch straight cylindrical shank. Rated for drilling steel, cast iron, aluminum, non-ferrous metals, and high-temperature alloys per workpiece material codes P, M, K, N, and S.

Installation Notes

This bit is installed and operated by machinists or maintenance technicians using a drill press, CNC machine, or handheld drill with a compatible chuck or collet. Secure the shank fully in the chuck before operation and verify runout before beginning a production run. At this diameter, apply consistent, controlled feed pressure and use cutting fluid where appropriate to manage heat buildup. Inspect the bit for wear or chipping before each use, as small-diameter cobalt bits are subject to breakage if fed too aggressively or run without proper support.