Precision Twist Drill 5998644 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998644 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a coated finish, this 0.75 inch diameter bit features a 118-degree standard point angle and a web-thinned, tapered web configuration for improved chip evacuation and reduced thrust at entry. The straight-cylindrical shank seats securely in standard drill chucks. At 5 inches overall length with a 3.125-inch flute, it delivers the compact rigidity screw machine length tools are known for. Series R40 construction is rated for general purpose and high-performance use, meeting ANSI standards throughout.

This bit is sized for drilling titanium as its primary workpiece material, making it well-suited for aerospace, mechanical, and precision fabrication work where tight tolerances and clean entry holes matter. The regular spiral, spiral flute geometry at a 2.5xD flute-to-diameter ratio controls chips effectively in both through-hole and blind-hole drilling. Machinists, tool-and-die workers, and maintenance trades working with ferrous and non-ferrous alloys will find this bit appropriate for bench drill presses, CNC machining centers, and hand-held drill applications requiring a shorter, stiffer cutting tool.

Key Features

• 0.75 inch (3/4 inch) diameter with 118-degree standard point angle for clean entry on a wide range of materials
• Web-thinned, tapered web configuration reduces drilling thrust and improves chip flow
• High speed steel construction with coated finish for extended tool life
• Screw machine length body provides added rigidity and reduced deflection compared to jobber length bits
• Right-hand cut spiral flute geometry rated for titanium and other demanding workpiece materials
• Meets ANSI standards; Series R40 rated for high-performance general purpose use

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard straight-shank drill chucks on bench drill presses, CNC machining centers, and hand-held drills accepting a 0.75 inch straight-cylindrical shank. Rated per ANSI specification for use in the 0.6000 inch and above drill bit size range.

Installation Notes

Secure the straight-cylindrical shank fully and evenly in the drill chuck before operation and verify runout before beginning a cut. Ensure the workpiece is clamped or fixtured properly to prevent movement during drilling. When drilling titanium or hardened alloys, use appropriate cutting fluid to manage heat and preserve tool life. Follow all applicable machine safety standards and wear appropriate personal protective equipment during operation.