Precision Twist Drill 5998496 39/64 in Hss Screw Machine Drill

Product Description

The PRECISION TWIST DRILL 5998496 is a screw machine length drill bit engineered for high-performance metal removal in demanding shop and field applications. Built from high-speed steel (HSS) with a bright/uncoated finish, this bit measures 39/64 inch (0.6094 inches) in diameter and carries a 118-degree standard point angle. The web-thinned, tapered web design reduces thrust force at the cutting tip, improving penetration efficiency. The spiral flute geometry promotes chip evacuation during drilling. This bit is sized and constructed for machinists, tool-room technicians, and maintenance tradespeople who require a reliable general-purpose drill bit in a stub-length configuration.

The 5998496 is intended for use in screw machine operations, drill presses, and production drilling setups where a shorter overall length provides improved rigidity and reduced deflection. The primary listed workpiece material is titanium, though the HSS construction and general-purpose grade make this bit applicable across a broad range of ferrous and non-ferrous materials in both shop and industrial maintenance environments. The straight-cylindrical shank accepts standard three-jaw chucks without adapters.

Key Features

• 39/64 inch (0.6094 inches) diameter with screw machine (stub) length for increased rigidity
• 118-degree standard point angle for general-purpose drilling
• Web-thinned tapered web reduces entry thrust and improves bit life
• High-speed steel construction rated for high-performance cutting, including titanium
• Right-hand cut spiral flute for efficient chip removal
• ANSI-standard geometry, Series R40, with 2.5xD flute-to-diameter ratio

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard three-jaw drill chucks and screw machine setups accepting a straight-cylindrical shank in the 39/64 inch diameter range, conforming to ANSI standards.

Installation Notes

This bit is installed and serviced by machinists and maintenance technicians using standard drill press or screw machine equipment. Secure the straight-cylindrical shank firmly in a three-jaw chuck before operation and verify chuck key is removed prior to powering the spindle. Match spindle speed (RPM) to the workpiece material and bit diameter per standard machining feed-and-speed tables. Use appropriate cutting fluid for the workpiece material to extend bit life and maintain dimensional accuracy.