Precision Twist Drill 5998588 27/64 in Screw Machine Drill

Product Description

The PRECISION TWIST DRILL 5998588 is a 27/64 inch (0.4219 inches) diameter screw machine length drill bit manufactured from high speed steel with a bright/uncoated finish. Built to Series R40 specifications and conforming to ANSI standards, it features a standard 118-degree point angle, a tapered web with web thinning, and a regular spiral flute configuration. The straight-cylindrical shank seats securely in standard drill chucks. At 3-3/8 inches overall length with a 2-inch flute length, this stub-length geometry provides added rigidity for accurate hole location. Licensed machinists, tool-and-die technicians, and mechanical contractors reach for this bit when short, stiff drilling action is required.

The 5998588 is rated for high performance drilling in titanium as its primary workpiece material, though its general-purpose grade and HSS construction also handle a broad range of ferrous and non-ferrous metals encountered in production and maintenance settings. The 2.5xD flute-to-diameter ratio and web-thinned point reduce thrust and improve chip evacuation in shorter-stroke applications. Right-hand cutting direction is standard. No coolant-through capability is present, so external coolant or cutting fluid application is the appropriate approach when heat management is required.

Key Features

• 27/64 inch (0.4219 inches) diameter, screw machine (stub) length for enhanced rigidity
• High speed steel construction with bright/uncoated finish
• 118-degree standard point angle with web thinning for reduced entry thrust
• Tapered web and regular spiral flute for efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI standards; Series R40 designation

Compatibility

Designed as an OEM-style screw machine length drill bit suitable for use in standard drill presses, milling machines, and hand-held power tools accepting a straight-cylindrical shank. Rated for titanium as the primary workpiece material per manufacturer specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with cutting tool safety. Ensure the machine spindle and chuck are fully stopped and de-energized before inserting or removing the bit. Secure the shank fully in the chuck to the recommended grip depth to prevent pullout under load. Apply appropriate cutting fluid or external coolant when drilling titanium or other hard metals to manage heat buildup, as this bit does not have coolant-through capability.