Precision Twist Drill 5998575 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998575 is a screw machine length drill bit designed for high-speed steel cutting in demanding shop and field applications. It measures 0.125 inches (1/8 inch) in diameter with an overall length of 1.875 inches and a flute length of 0.875 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve chip evacuation. Built from high speed steel with a bright uncoated finish, this bit is suited for machinists, maintenance techs, and trade professionals who need a reliable general-purpose drill in compact stub length.

This bit is part of the Series R40 line and carries an ANSI specification designation. The screw machine length body makes it well-suited for drill presses, CNC machining centers, and hand-held power drills where rigidity and short overhang matter. Its primary workpiece material rating is titanium, though the general-purpose grade and HSS construction make it applicable across a range of metals and hard plastics commonly encountered in HVAC, plumbing, and electrical trade work. The 2.5xD flute-to-diameter ratio supports chip clearance in moderate-depth holes.

Key Features

• 0.125 inch (1/8 inch) diameter with 118-degree standard point angle for clean entry
• Web-thinned tapered web reduces thrust force and improves center cutting performance
• High speed steel construction rated for high performance applications including titanium
• Bright uncoated finish suitable for use with cutting fluids or dry
• Screw machine (stub) length at 1.875 inches overall for maximum rigidity and reduced deflection
• Right hand cut with regular spiral flute; straight-cylindrical shank fits standard chucks

Compatibility

Designed as an OEM-style replacement and standard-stock drill bit for use in any drill press, CNC machining center, or power drill fitted with a standard straight-shank chuck sized for 0.125 inch tooling.

Installation Notes

Installation and use should follow standard machining safety practices. Secure the workpiece firmly before drilling and ensure the chuck is fully tightened on the straight-cylindrical shank before operation. Power down all equipment before changing bits. When drilling metals, apply appropriate cutting fluid to extend tool life and reduce heat buildup.