Precision Twist Drill 5997695 Cobalt Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5997695 is a cobalt jobber-length drill bit designed for production drilling in steel and other demanding materials. Built to wire size 15 (0.1800 inches), it features a 135-degree split-point angle with web thinning for fast penetration and reduced walking on entry. The straw oxide finish provides mild heat resistance and lubricity. Overall length is 3.375 inches, with a 2.1875-inch flute length and a straight shank diameter of 0.1800 inches. Licensed HVAC, plumbing, electrical, and mechanical trades all use cobalt jobber bits for drilling through structural steel, sheet metal, and hard alloys where high-speed steel alone falls short.

This drill bit is suited for general-purpose drilling in steel, stainless, cast iron, and non-ferrous metals in both residential and light commercial applications. The R10CO-R15CO-R18CO series covers a wire-gauge size range of 0.1500 to 0.2000 inches decimal, making this bit appropriate wherever wire gauge 15 clearance or pilot holes are required. Typical applications include panel fabrication, equipment mounting, conduit entry drilling, and pipe flange work where hole accuracy and tool life matter.

Key Features

• Cobalt construction for heat resistance and extended tool life in steel and hard alloys
• 135-degree split point with web thinning reduces thrust and prevents bit walking
• Straw oxide finish provides lubricity and mild corrosion protection
• Regular spiral flute with 12xD flute-to-diameter ratio handles chip evacuation effectively
• Straight shank fits standard 3-jaw drill chucks without adapters
• Meets ANSI and NAS 907 standards for dimensional and performance consistency

Compatibility

Part of the R10CO-R15CO-R18CO series, covering wire-gauge drill sizes in the 0.1500 to 0.2000 inch decimal range. Designed as an OEM-style replacement or direct substitute for wire size 15 cobalt jobber drill bits conforming to ANSI and NAS 907 specifications. Fits any standard drill chuck accepting a 0.1800-inch straight shank.

Installation Notes

Install in a keyed or keyless drill chuck rated for the RPM and torque of the application. Power down and secure the workpiece before changing bits. Use cutting fluid or coolant when drilling steel to extend tool life, noting that this bit does not support through-coolant delivery. Follow applicable shop safety codes and OSHA requirements for eye protection and workpiece clamping when operating rotary cutting tools.