Precision Twist Drill 5998579 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998579 is a screw machine length drill bit designed for high-performance metal cutting in industrial and shop environments. Built from high speed steel with a coated finish, this bit features a 0.875-inch diameter, a 118-degree standard point angle, and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. It is sized for machinists, tool and die technicians, and trade professionals who require repeatable accuracy in short-length drilling applications.

This drill bit is rated for use in high-performance general-purpose drilling, with titanium listed as the primary workpiece material. The screw machine length body offers a shorter overall profile of 5.5 inches compared to jobber-length bits, providing added rigidity and reduced deflection in tight setups or production drilling scenarios. The 3.5-inch flute length and 2.5xD flute-to-diameter ratio support effective chip clearance across a range of feed rates. It is well suited for use in drill presses, CNC machining centers, and manual milling setups.

Key Features

• 0.875-inch diameter, screw machine length for increased rigidity and reduced deflection
• High speed steel construction with coated finish for improved wear resistance
• 118-degree standard point angle with web thinning for reduced entry thrust
• Right-hand spiral flute promotes efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks
• Meets ANSI standards; Series R40 high-performance designation

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for applications requiring a 0.875-inch diameter screw machine length bit in straight-cylindrical shank configurations. Primary workpiece material listed as titanium; suitable for general-purpose drilling in applicable setups. Drill bit size range compatibility begins at 0.6000 inches and above per Series R40 specifications.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drill press, CNC, or manual milling equipment. Secure the straight-cylindrical shank firmly in the chuck before operation and verify that spindle speed is appropriate for the workpiece material. Coolant-through is not supported on this bit; apply external cutting fluid as required by the workpiece material and feed rate. Follow applicable shop safety procedures and ANSI machine tool standards during setup and operation.