Precision Twist Drill 5998621 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998621 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a bright uncoated finish, this bit features a 17/32 inch (0.5313 inch) diameter, a 118-degree standard point angle, and a right-hand spiral flute with web thinning for improved chip evacuation and reduced thrust. The straight-cylindrical shank seats securely in standard drill chucks. It belongs to the Series R40 line, which is engineered for general-purpose and high-performance use. Machinists, tool-and-die technicians, and maintenance professionals typically install and operate this bit.

This drill bit is suited for use in screw machine operations and short-hole drilling applications where a stubby, rigid setup is required to minimize deflection. The 2.5xD flute-to-diameter ratio and tapered web configuration make it effective on harder workpiece materials, including titanium, as noted in the product specifications. The compact screw machine length provides added stability in high-cycle production environments and close-tolerance machining setups.

Key Features

• 17/32 inch (0.5313 inch) diameter within the 0.5000 to 0.6000 inch size range
• 118-degree standard point angle for general-purpose entry geometry
• Web-thinned, tapered web design reduces cutting resistance and improves chip flow
• Right-hand spiral flute with regular helix for consistent chip evacuation
• High speed steel construction rated for high-performance use including titanium workpieces
• Screw machine (stub) length provides rigidity and reduces deflection in close-work setups
• Meets ANSI standards

Compatibility

Designed as an OEM-style screw machine length drill bit compatible with standard straight-shank drill chucks; listed primary workpiece material compatibility includes titanium per manufacturer specifications.

Installation Notes

This bit is installed by machinists, toolroom technicians, and maintenance professionals using standard drill presses, lathes, or CNC machining centers equipped with compatible chuck systems. Ensure the machine is fully powered down and locked out before changing bits. Confirm the shank is fully seated and the chuck is tightened before operation. Follow applicable shop safety procedures and manufacturer feed-and-speed recommendations for the target workpiece material.