Precision Twist Drill 5998749 41/64 in Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5998749 is a jobber-length twist drill bit designed for general-purpose drilling in metalworking and fabrication applications. Manufactured from high-speed steel with a steam oxide coating, it offers improved lubricity and corrosion resistance during cutting. The bit measures 41/64 inches (0.6406 inches) in diameter with a 118-degree standard point angle, a spiral flute configuration, and a straight-cylindrical shank. Overall length is 7.125 inches with a flute length of 5.1875 inches. The web-thinned, tapered web design reduces thrust and improves chip evacuation in tougher workpiece materials. This bit is installed and used by machinists, maintenance mechanics, HVAC technicians, pipefitters, and other tradespeople working with metal substrates.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits standard drill presses, portable electric drills, and magnetic base drills that accept a straight-cylindrical shank of 0.6406 inches. The Series R10 designation places it in the ANSI-standard jobber-length family, making it a reliable fit for production drilling, maintenance, and repair operations across residential and light commercial mechanical trades. Coolant-through capability is not featured on this bit, so surface-applied cutting fluid or cutting oil is recommended when drilling harder materials.

Key Features

• High-speed steel construction with steam oxide coating for improved lubricity and wear resistance
• 118-degree standard point angle suitable for a broad range of metal workpiece materials
• Web-thinned, tapered web reduces drilling thrust and improves chip clearing
• Spiral flute with regular spiral type promotes efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks
• ANSI-standard jobber length with 8xD flute-to-diameter ratio for versatile reach

Compatibility

Designed as a general-purpose ANSI-standard jobber-length drill bit compatible with any drill press, handheld drill, or magnetic drill accepting a 0.6406-inch straight-cylindrical shank. Suitable for workpiece materials coded P, M, K, N, and S, covering steel, stainless steel, cast iron, non-ferrous metals, and superalloys.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and trade professionals using standard drill presses or portable drills. Ensure the drill chuck is fully tightened on the straight shank before operation and that the workpiece is secured in a vise or fixture. When drilling ferrous metals or hard alloys, apply cutting fluid to the tip to extend bit life and prevent work hardening. Inspect the cutting edges before each use and discard or resharpen bits with chipped or dulled flutes.