Precision Twist Drill 5998510 45/64 in Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998510 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel (HSS) with a coated finish, this bit measures 0.7031 inches (45/64 inch) in diameter with a 118-degree standard point angle and a web-thinned, tapered web configuration for improved penetration and reduced thrust. The overall length is 4.75 inches with a 3-inch spiral flute. It features a straight-cylindrical shank and right-hand cutting direction, conforming to ANSI standards. Licensed machinists, HVAC service technicians, and trade professionals across multiple disciplines rely on this Series R40 bit for precision work.

This screw machine drill bit is engineered for use on titanium as its primary workpiece material, making it appropriate for high-performance and specialty fabrication environments. The screw machine length format provides a shorter, more rigid profile than jobber-length bits, which is advantageous in tight clearance situations or when working in drill press and machine tool setups. The 2.5xD flute-to-diameter ratio supports effective chip evacuation during deeper cuts. It is suited for both production shop and field service scenarios where controlled, accurate hole sizing is required.

Key Features

• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle with web-thinned tapered web for reduced entry force
• Screw machine length profile provides added rigidity over jobber-length alternatives
• Right-hand spiral flute with 2.5xD ratio for efficient chip clearing
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI standards for dimensional accuracy and consistency

Compatibility

Designed as an OEM-style replacement and direct-fit screw machine drill bit for applications requiring a 45/64 inch (0.7031 inch) diameter bore, compatible with standard straight-shank drill chucks across bench-top and floor-standing drill press setups conforming to Series R40 tooling specifications.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotating tool safety. Secure the straight-cylindrical shank firmly in the drill chuck before operation and confirm the workpiece is clamped or fixtured to prevent movement. Always power down and de-energize the drilling machine before changing bits. Use appropriate cutting fluid or coolant where the material or cut depth requires it, as this bit does not support through-coolant delivery.