Precision Twist Drill 5998182 Cobalt Jobber Drill 3/64 in

Product Description

The PRECISION TWIST DRILL 5998182 is a cobalt jobber-length drill bit designed for high-performance drilling in ferrous and non-ferrous metals. Ground to a 135-degree split point with web thinning, it reduces walking on entry and lowers thrust requirements compared to standard 118-degree geometry. The straw oxide finish provides lubricity and mild corrosion resistance during operation. At 1.75 inches overall length with a 0.75-inch flute, this is a compact bit suited for tight-clearance work. The straight cylindrical shank accepts standard three-jaw drill chucks. It meets ANSI and NAS 907 standards and is rated as a heavy-duty general-purpose tool for production and maintenance drilling environments.

This bit is sized at 3/64 inch (0.0469 inch decimal) and is intended for drilling steel and a broad range of workpiece materials including cast iron, non-ferrous alloys, stainless, and high-temp alloys, as indicated by the P, M, K, N, and S material codes. It suits maintenance technicians, machinists, pipefitters, and fabricators who need a small-diameter cobalt bit for pilot holes, precision drilling in tight spaces, or through-drilling thin stock. The Series R10CO-R15CO-R18CO designation identifies this as part of Precision Twist Drill's cobalt jobber line. Sold individually; minimum order quantity is 12 units.

Key Features

• Cobalt high-speed steel construction for heat resistance in hard and abrasive materials
• 135-degree split point with web thinning for self-centering entry and reduced thrust
• Straw oxide finish improves lubricity and surface hardness
• Regular spiral flute with 16xD flute-to-diameter ratio for efficient chip evacuation
• Right-hand cutting, straight cylindrical shank fits standard drill chucks
• Meets ANSI and NAS 907 standards; heavy-duty grade rating

Compatibility

Designed as an OEM-style jobber drill suitable for use in any standard three-jaw drill chuck or collet system accepting a 3/64 inch straight shank. Part of the Precision Twist Drill Series R10CO-R15CO-R18CO cobalt line.

Installation Notes

Install in a drill press, hand drill, or CNC spindle with a chuck rated for the shank diameter. Power down and lock out the machine before changing bits. Use appropriate cutting fluid or cutting oil when drilling steel to extend bit life and reduce heat buildup. Inspect the cutting edges for wear or chipping before each use, as small-diameter cobalt bits can fracture under side load or excessive feed pressure.