Precision Twist Drill 5998475 3/64 in Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998475 is a screw machine length drill bit designed for high-speed steel cutting in tight-tolerance drilling applications. Built to Series R40 standards, it measures 0.0469 inches (3/64 inch) in diameter with an overall length of 1.375 inches and a flute length of 0.5 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve chip evacuation. This bit is rated for high performance use and conforms to ANSI standards, making it a reliable choice for production drilling environments where precision and repeatability are required.

This bit is suited for drilling into titanium and other metals in screw machine and short-hole drilling operations. The screw machine length profile — shorter than jobber length — provides added rigidity, which is especially useful when working in drill presses, turret lathes, CNC machining centers, and screw machine setups. The 2.5xD flute-to-diameter ratio supports efficient chip removal in shallow-to-medium depth holes. Machinists and tool-and-die professionals are the primary users in both job shop and production settings.

Key Features

• 3/64 inch (0.0469 inches) diameter — screw machine length for added rigidity
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• High speed steel construction — bright/uncoated finish for general purpose use
• Right-hand cut with regular spiral flute for consistent chip evacuation
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Conforms to ANSI standards — Series R40

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard drill chucks and collet systems that accept straight-cylindrical shanks. Primary workpiece material rating is titanium; suitable for general purpose metal drilling applications where a short-length, high-rigidity bit is specified.

Installation Notes

Installation and use of this drill bit should be performed by machinists or tool operators familiar with drill press, lathe, or CNC equipment. Ensure the chuck or collet is fully tightened and the workpiece is securely fixtured before beginning any drilling operation. Match spindle speed and feed rate to the workpiece material and bit diameter per standard machining tables. Inspect the cutting edges for wear or chipping before each use and replace the bit if damage is present.