Precision Twist Drill 5998517 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998517 is a screw machine length drill bit engineered for high-performance metal removal in demanding shop and field applications. Built from high speed steel with a coated finish, this bit measures 1.125 inches in diameter with an overall length of 6.375 inches and a flute length of 4 inches. The 118-degree standard point angle and regular spiral flute geometry deliver clean, accurate entry and efficient chip evacuation. Licensed machinists, toolroom technicians, and fabricators working with tight-tolerance applications will find this bit suited to repetitive drilling operations where rigidity and controlled depth matter.

The 5998517 is designed for use in CNC machining centers, drill presses, and manual lathes where a stub-length tool is preferred for reduced deflection. The straight-cylindrical shank seats securely in standard drill chucks and collet holders. Its flute-to-diameter ratio of 2.5xD and Series R40 construction target high-performance drilling in materials including titanium and other challenging workpiece materials. This bit meets ANSI standards and is suited for general-purpose production environments requiring consistent hole quality at 1.125 inches diameter.

Key Features

• 1.125-inch diameter with screw machine (stub) length for reduced deflection and improved rigidity
• High speed steel construction with coated finish for extended tool life
• 118-degree standard point angle for accurate self-centering on entry
• Regular spiral flute design promotes efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collet systems
• Meets ANSI standards; Series R40 high-performance designation

Compatibility

Designed as a general-purpose OEM-style screw machine length drill bit for use in CNC machining centers, drill presses, lathes, and similar equipment accepting a straight-cylindrical shank at 1.125 inches diameter. Primary workpiece material is titanium; also suitable for general production drilling applications.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom personnel familiar with cutting tool safety. Ensure the machine spindle is fully stopped and the tool holder is clean and undamaged before seating the shank. Verify chuck or collet runout is within acceptable limits before drilling to avoid premature tool wear or workpiece damage. Follow applicable shop safety procedures and machine manufacturer guidelines for feed rates and speeds appropriate to the workpiece material.