Precision Twist Drill 5998923 Screw Machine Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 5998923 is a screw machine length high speed steel drill bit designed for precision drilling in metalworking and general fabrication applications. Sized at 0.266 inches (17/64 inch, Letter H), it features a 118-degree standard point angle and a bright/uncoated finish. The right-hand spiral flute geometry and web-thinned, tapered web construction reduce thrust and improve chip evacuation. At 2-11/16 inches overall length with a 1-1/2 inch flute length, this bit fits standard drill chucks via its straight-cylindrical shank. It is built to ANSI standards and suited for high-performance general-purpose drilling.

This screw machine length drill bit is intended for use in drill presses, CNC machining centers, and hand-held power drills where a shorter, more rigid bit is preferred over jobber length. The primary listed workpiece material is titanium, though the Series R42 HSS construction also handles steel, aluminum, and other common shop materials. The 2.5xD flute-to-diameter ratio supports stable chip clearance in shallow to moderate-depth holes. Typical users include machinists, tool and die makers, and maintenance technicians working in production or job-shop environments.

Key Features

• 0.266 inch (17/64 inch, Letter H) diameter in screw machine length for added rigidity
• 118-degree standard point angle with web thinning for reduced entry thrust
• High speed steel construction rated for high-performance general-purpose drilling
• Bright/uncoated finish compatible with cutting fluids and coolants
• Right-hand cut with regular spiral flute for efficient chip removal
• Straight-cylindrical shank fits standard three-jaw drill chucks

Compatibility

Designed as a general-purpose screw machine length drill bit conforming to ANSI standards, suitable for use in drill presses, lathes, and CNC equipment accepting straight-cylindrical shank bits in the 0.2500 to 0.3000 inch diameter range.

Installation Notes

Installation is performed by machinists or maintenance technicians. Secure the straight-cylindrical shank firmly in the drill chuck before operation and verify chuck key is removed before powering the machine. Apply appropriate cutting fluid when drilling titanium or hardened steel to extend bit life and maintain dimensional accuracy. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed.