Precision Twist Drill 5998481 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998481 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a coated finish, this bit measures 0.9688 inches (31/32 inch) in diameter and cuts in a right-hand direction with a standard 118-degree point angle. The spiral flute design and web-thinned, tapered web construction reduce thrust and improve chip evacuation. At 5-7/8 inches overall length with a 3-7/8 inch flute length, it fits standard straight-cylindrical shank chucks and drill presses used by machinists and fabricators.

This Series R40 bit is built for screw machine length applications where a shorter, stiffer profile improves accuracy and reduces deflection in production drilling setups. It is rated for use on titanium as its primary workpiece material, making it well suited for aerospace, industrial maintenance, and precision fabrication environments. The 2.5xD flute-to-diameter ratio supports chip clearing in moderate-depth holes. It meets ANSI standards and is sold individually.

Key Features

• 0.9688 inch (31/32 inch) diameter with 118-degree standard point angle
• High speed steel construction with coated finish for extended tool life
• Web-thinned, tapered web reduces entry thrust and improves cutting efficiency
• Screw machine length profile provides added rigidity over jobber length bits
• Spiral flute, right-hand cut for standard drill press and CNC lathe use
• Meets ANSI standards; Series R40 designation

Compatibility

Designed as a screw machine length replacement or production drill bit compatible with straight-cylindrical shank drill chucks. Primary workpiece material rating is titanium; also suitable for general-purpose ferrous and non-ferrous metal drilling per ANSI Series R40 specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tool operators familiar with drill press, CNC lathe, or screw machine setups. Secure the straight-cylindrical shank fully in a properly sized chuck before operation. Always power down and lock out the machine before changing or inspecting tooling. Do not exceed the recommended feed and speed parameters for the workpiece material being drilled.