Precision Twist Drill 5998797 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998797 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from high speed steel (HSS) with a bright, uncoated finish, this bit features a 0.18 inch diameter, a standard 118-degree point angle, and a right-hand spiral flute for efficient chip evacuation. The web-thinned, tapered web construction reduces cutting resistance at the tip, making it well suited for production drilling where tool life and hole quality matter. Machinists and tool-and-die technicians are the primary users of this bit type.

This bit is sized at 0.18 inches (wire size number 15) and falls within the 0.1500 to 0.2000 inch drill bit size range of the Series R41 lineup. The screw machine length format — shorter than jobber-length bits — provides added rigidity and reduced deflection, making it appropriate for drill press work, CNC machining centers, and turret lathes in both job shops and production environments. The primary listed workpiece material is titanium, though the bit is suited to a range of metals requiring a general-purpose HSS cutting edge.

Key Features

• High speed steel construction with bright, uncoated finish for general-purpose metal drilling
• 118-degree standard point angle for broad material compatibility
• Web-thinned, tapered web reduces entry force and improves centering
• Screw machine (stub) length provides superior rigidity and reduced deflection versus jobber-length bits
• Right-hand spiral flute promotes effective chip clearing during drilling
• Meets ANSI standards; Series R41 designation

Compatibility

Designed as a Series R41 screw machine length HSS drill bit with a straight-cylindrical shank, compatible with standard drill chucks and collet systems accepting 0.18 inch straight shanks. Primary listed workpiece material is titanium; suitable for general metal cutting applications per ANSI specification.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with rotating cutting tools. Secure the straight-cylindrical shank firmly in the chuck or collet before operating. Ensure the drilling machine is powered down and locked out before changing bits. Follow applicable shop safety standards and manufacturer feed and speed recommendations for the workpiece material being drilled.