Precision Twist Drill 5998602 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998602 is a screw machine length drill bit designed for high-performance metal drilling applications. Built from high speed steel (HSS) with a coated finish, it measures 0.8125 inches (13/16 inch) in diameter with an overall length of 5.25 inches and a flute length of 3.375 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve centering on hard materials. Licensed machinists, tool-and-die workers, and maintenance mechanics use this bit where a shorter, stiffer stub-style profile is needed over a jobber-length bit.

The 5998602 is engineered for drilling titanium and comparable hard metals, making it appropriate for aerospace maintenance, industrial fabrication, and precision machining environments. The R40 series designation places it within PRECISION TWIST DRILL's screw machine product line, conforming to ANSI standards. The straight-cylindrical shank accepts standard drill chucks on lathes, drill presses, and CNC machining centers. The 2.5xD flute-to-diameter ratio provides adequate chip clearance without sacrificing rigidity in short-reach drilling setups.

Key Features

• 0.8125 inch (13/16 inch) diameter, screw machine length for increased rigidity
• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• Right-hand cut, spiral flute with 2.5xD flute-to-diameter ratio for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to ANSI standards; rated for titanium as primary workpiece material

Compatibility

Designed for use in standard drill chucks on lathes, drill presses, and CNC machining centers; rated by the manufacturer for titanium as the primary workpiece material and suitable for general-purpose applications in the 0.6000 inch and larger diameter range per R40 series specifications.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance personnel familiar with rotating cutting tools. Secure the shank fully in the drill chuck and verify runout before starting the cut. Power down and lock out the machine before changing bits or clearing chips. Always wear appropriate eye protection and follow shop-specific speeds-and-feeds guidelines for HSS tooling in hard metals such as titanium.