Precision Twist Drill 5998731 Jobber Drill Bit 31/64 in

Product Description

The PRECISION TWIST DRILL 5998731 is a jobber-length twist drill bit designed for general-purpose drilling in metalworking applications. Manufactured from high speed steel (HSS) with a steam oxide coating, it measures 31/64 inches (0.4844 inches) in diameter and delivers a 118-degree standard point angle for accurate starting and clean entry. The two-flute spiral design with a regular helix and web-thinned, tapered web construction promotes efficient chip evacuation and reduces thrust during drilling. This bit is suited for use in drill presses, lathes, and hand-held power drills operated by machinists, maintenance technicians, and fabricators working across a range of material types.

This drill bit is built for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The Series R10 designation places it within the PRECISION TWIST DRILL standard jobber-length lineup. With a flute-to-diameter ratio of 9xD and a maximum drilling depth of 4.375 inches, it handles moderate-depth holes in production and maintenance environments. The straight cylindrical shank seats in standard drill chucks without adapters, making it a practical fit for common shop and field setups.

Key Features

• High speed steel construction with steam oxide coating for corrosion resistance and reduced friction
• 118-degree standard point angle for general-purpose drilling across multiple materials
• Web-thinned, tapered web design reduces cutting force and improves chip flow
• Two spiral flutes with regular helix promote consistent chip evacuation
• Straight cylindrical shank compatible with standard drill chucks
• Conforms to ANSI standards for jobber-length drill bits

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit suitable for use in standard drill chucks on drill presses, milling machines, lathes, and portable power drills across metalworking, maintenance, and fabrication applications.

Installation Notes

Installation and use of this drill bit should be performed by machinists or qualified technicians familiar with rotating tool safety. Secure the shank fully in a properly rated drill chuck and verify chuck key removal before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Do not exceed the rated capacity of the drill or chuck for the material being drilled.