Precision Twist Drill 5998611 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998611 is a screw machine length drill bit designed for high-performance metal drilling applications. Built from high-speed steel with a coated finish, it measures 15/16 inch (0.9375 inch) in diameter and features a 118-degree standard point angle with web thinning for easier penetration and reduced thrust. The straight cylindrical shank and regular spiral flute promote consistent chip evacuation. At 5.75 inches overall length with a 3.75-inch flute length, this bit fits standard drill chucks and machine tool setups used by machinists and maintenance technicians across manufacturing and industrial environments.

This drill bit is rated for use on titanium as its primary workpiece material, making it well-suited for demanding metal fabrication and machining operations where tool integrity under high-stress cutting conditions is critical. The Series R40 designation and ANSI-standard compliance position it for use in production and job-shop environments. Its screw machine length profile — shorter than jobber length — provides added rigidity, which helps maintain accuracy when drilling at higher feed rates or into tough alloys.

Key Features

• 15/16 inch (0.9375 inch) diameter with straight cylindrical shank of matching diameter
• 118-degree standard point angle with web thinning and tapered web configuration for reduced entry force
• High-speed steel construction with coated finish for extended tool life
• Screw machine length profile at 5.75 inches OAL provides greater rigidity than jobber-length bits
• Regular spiral flute with 2.5xD flute-to-diameter ratio for effective chip clearance
• ANSI-compliant, Series R40, rated for titanium and other demanding workpiece materials

Compatibility

Designed for use in standard drill presses, CNC machines, and manual machine tool setups accepting a 0.9375-inch straight cylindrical shank. Rated for titanium as the primary workpiece material per supplier specification.

Installation Notes

This bit is installed by machinists or maintenance technicians into compatible drill chucks or collet holders. Ensure the machine is fully powered down and locked out before changing tooling. Secure the shank firmly and verify concentricity before operation. Use appropriate cutting fluid for titanium and hard-metal applications to manage heat buildup and preserve tool edge life.