Precision Twist Drill 5998744 Jobber Drill Bit 39/64 in

Product Description

The PRECISION TWIST DRILL 5998744 is a jobber-length twist drill bit designed for general-purpose drilling in a wide range of metallic and hard materials. Built from high-speed steel with a steam oxide coating, it provides corrosion resistance and reduces friction during cutting. The bit features a 118-degree standard point angle, a two-flute right-hand spiral configuration, and a web-thinned, tapered web for improved chip clearance and easier penetration. The straight-cylindrical shank measures 39/64 inches in diameter, matching the cutting diameter for consistent chucking in standard drill chucks. Machinists, maintenance mechanics, and trade professionals use this bit for production and field drilling applications alike.

This drill bit is rated for use on steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Its 5-3/16-inch flute length allows a maximum drilling depth of 5-3/16 inches, making it well suited for through-hole and deep-hole work in structural fabrication, mechanical assembly, and maintenance repair operations. The Series R10 designation places it within PRECISION TWIST DRILL's standard jobber-length product family, manufactured to ANSI specifications.

Key Features

• High-speed steel construction with steam oxide coating for reduced friction and corrosion resistance
• 118-degree standard point angle with web-thinned, tapered web for clean entry and reduced thrust
• Two-flute right-hand spiral with regular spiral type for efficient chip evacuation
• 39/64-inch (0.6094 inch) cutting diameter with matching straight-cylindrical shank for secure chuck engagement
• Overall length of 7-1/8 inches with a 5-3/16-inch flute length supporting depths up to 5-3/16 inches
• ANSI-compliant general-purpose grade suitable for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium

Compatibility

Designed as an OEM-style replacement and general-purpose jobber drill bit compatible with standard 3-jaw drill chucks and CNC toolholders accepting straight-cylindrical shanks in the 39/64-inch diameter range.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drill press, lathe, or CNC machine operation. Secure the straight-cylindrical shank fully in the chuck before powering the machine, and confirm the chuck key is removed before starting. Use appropriate cutting fluid or coolant for ferrous and hard materials to extend tool life. Inspect the cutting edges and point for wear or chipping before each use.