Precision Twist Drill 5998616 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998616 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a bright uncoated finish, this bit measures 15/32 inch (0.4688 inches) in diameter with an overall length of 3-5/8 inches and a flute length of 2-1/8 inches. The 118-degree standard point angle and right-hand spiral flute geometry deliver clean, accurate entry in a wide range of workpiece materials. The web-thinned, tapered web configuration reduces thrust and improves chip evacuation, making this bit well-suited for production drilling environments where cycle time and hole quality both matter.

This drill bit is rated for use in screw machine and short-hole drilling applications where a compact overall length improves rigidity and reduces deflection. The Series R40 designation places it in a high-performance general-purpose category, with a flute-to-diameter ratio of 2.5xD. It is particularly suited for drilling titanium and similarly demanding materials in machining, fabrication, and maintenance-of-equipment contexts. The straight cylindrical shank fits standard drill chucks without adapters. Machinists, tool-and-die techs, and maintenance mechanics are the primary users of this bit style.

Key Features

• 15/32 inch (0.4688 inches) diameter, screw machine length for improved rigidity over jobber-length bits
• High speed steel construction with bright uncoated finish for general-purpose cutting
• 118-degree standard point angle with web thinning for reduced entry thrust
• Right-hand spiral flute with tapered web configuration for efficient chip evacuation
• Straight cylindrical shank compatible with standard drill chucks
• Meets ANSI standards; rated for titanium and other high-performance workpiece materials

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with any standard drill chuck or screw machine spindle accepting a straight cylindrical shank in the 15/32 inch diameter range. Suitable for use on drill presses, CNC drilling machines, and turret lathes.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with cutting tool setup and machine operation. Ensure the spindle is fully stopped and the machine is powered down before changing bits. Secure the shank firmly in the chuck with appropriate torque applied to all chuck jaws to prevent slippage during operation. Always use appropriate cutting fluid or coolant for the workpiece material being drilled, and inspect the bit for wear or chipping before each use.