Precision Twist Drill 5998484 Screw Machine Drill Bit 31/64

Product Description

The PRECISION TWIST DRILL 5998484 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel (HSS) with a bright/uncoated finish, this bit measures 31/64 inch (0.4844 inches) in diameter and features a standard 118-degree split point angle with web thinning for reduced thrust and easier starting. The tapered web configuration and regular spiral flute promote efficient chip evacuation. At 3-11/16 inches overall length with a 2-3/16 inch flute length, this Series R40 bit is built for stub-length drilling where rigidity and precision matter most.

This drill bit is suited for use in machine shops, maintenance environments, and trade applications where controlled, accurate hole-making is required. The primary workpiece material designation is titanium, making it appropriate for hard metals and alloys. Its straight-cylindrical shank seats securely in standard drill chucks and machine spindles. The 2.5xD flute-to-diameter ratio provides stability in short-depth drilling setups. Machinists, maintenance technicians, and metal fabricators working with tight tolerances will find this a reliable general-purpose bit in the 0.4500 to 0.5000 inch size range.

Key Features

• 31/64 inch (0.4844 inches) diameter in Series R40 screw machine length format
• High speed steel construction for durability across a range of metals
• 118-degree standard point angle with web thinning for reduced entry thrust
• Tapered web and regular spiral flute for efficient chip removal
• Bright/uncoated finish — suitable for general-purpose and high-performance drilling
• Straight-cylindrical shank for compatibility with standard drill chucks and spindles
• Right-hand cut with ANSI-standard construction

Compatibility

Designed as an ANSI-standard screw machine length drill bit in the 0.4500 to 0.5000 inch diameter range, compatible with standard drill chucks and machine spindles accepting straight-cylindrical shanks. Rated for use in titanium as the primary workpiece material.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill press, milling machine, or handheld drill with an appropriately rated chuck. Ensure the shank is fully seated and the chuck is tightened securely before operation. Use appropriate cutting fluid or coolant when drilling hard metals such as titanium to extend tool life and maintain dimensional accuracy. Follow applicable shop safety procedures and machine manufacturer guidelines during setup and use.