Precision Twist Drill 5998619 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998619 is a screw machine length drill bit designed for high-performance metal drilling in demanding trade and industrial applications. Manufactured from high speed steel with a bright/uncoated finish, this bit features a 15/64 inch (0.2344 inch) diameter, a standard 118-degree point angle, and a web-thinned tapered web configuration that reduces thrust and improves chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 2-7/16 inches overall length with a 1-5/16 inch flute length, the stub-style body provides rigidity and minimizes deflection in close-quarters and production drilling setups.

This drill bit is suited for use in screw machine operations, CNC drilling, and bench drill press work where a shorter, stiffer bit is preferred over jobber-length alternatives. The R40 series is rated for general purpose cutting with high performance designation, making it appropriate for ferrous and non-ferrous metals. The primary workpiece material listed by the manufacturer is titanium, indicating this bit is engineered to handle tough, work-hardening materials common in aerospace, mechanical, and industrial maintenance work. Licensed machinists, tool-and-die technicians, and maintenance tradespeople are the typical installers and users.

Key Features

• 15/64 inch (0.2344 inch) diameter, Series R40 screw machine length
• 118-degree standard point angle with web-thinned tapered web for reduced entry thrust
• High speed steel construction, bright/uncoated finish
• Right-hand cut, regular spiral flute for efficient chip removal
• Straight-cylindrical shank compatible with standard drill chucks
• 2.5xD flute-to-diameter ratio for stub-length rigidity
• Meets ANSI standards

Compatibility

Designed as a general purpose screw machine length drill bit for use with standard drill chucks accepting straight-cylindrical shanks; rated for drilling titanium and other ferrous and non-ferrous metals within the 0.2000 to 0.2500 inch diameter range of the R40 series.

Installation Notes

This bit is installed by machinists and maintenance technicians into drill press, CNC, or hand drill chucks that accept straight-cylindrical shanks. Ensure the workpiece is properly fixtured and the chuck is fully tightened before operation. Use appropriate cutting fluid for hard or work-hardening materials such as titanium to extend tool life and manage heat buildup. Inspect the cutting edges for wear or chipping before each use and replace any bit showing visible damage.