Precision Twist Drill 5998503 43/64 in Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5998503 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a bright, uncoated finish, this bit features a 43/64 inch (0.6719 inches) diameter and a standard 118-degree point angle. The spiral flute design and web-thinned, tapered web configuration promote efficient chip evacuation and reduced thrust during entry. At 4-5/8 inches overall length with a 2-7/8 inch flute length, it fits standard drill chucks via its straight-cylindrical shank. Licensed machinists, pipefitters, and HVAC fabricators reach for this bit when precision hole sizing is required in tight-clearance setups.

This bit is rated for drilling titanium as its primary workpiece material, making it suitable for high-hardness, work-hardening alloys commonly encountered in industrial and mechanical fabrication environments. The screw machine length profile — shorter than jobber length — provides added rigidity and reduced deflection, which is especially useful when working in drill presses, CNC setups, or close-quarters manual drilling. The Series R40 designation places it in a well-established line of general-purpose high-performance HSS drill bits manufactured to ANSI standards. It ships as a single unit.

Key Features

• 43/64 inch (0.6719 inches) diameter for precise, repeatable hole sizing
• High speed steel construction rated for titanium and other high-hardness materials
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Screw machine length provides greater rigidity and less deflection versus jobber length
• Spiral flute design at 2.5xD flute-to-diameter ratio for efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Manufactured to ANSI standards, Series R40

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard drill chucks, drill presses, and CNC spindles accepting straight-cylindrical shanks at 43/64 inch diameter.

Installation Notes

This bit is installed and used by machinists, pipefitters, and fabrication tradespeople. Secure the shank firmly in the chuck or collet before operation and verify that the workpiece is clamped to prevent movement. Use appropriate cutting fluid or coolant for titanium and high-hardness alloys to extend tool life and prevent work hardening at the cut zone. Inspect the cutting edges for wear or chipping before each use and replace if the point is damaged.