Precision Twist Drill 5998823 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998823 is a screw machine length drill bit designed for high-performance drilling in demanding production environments. Built from high-speed steel (HSS) with a bright/uncoated finish, it features a 0.161 inch diameter (Wire Size 20), a 118-degree standard point angle, and a right-hand spiral flute for efficient chip evacuation. At 2.125 inches overall length with a 1.0625-inch flute, this stub-length bit delivers increased rigidity over jobber-length bits, making it well-suited for precision drilling on automated or manual machine setups where deflection control is critical.

This bit is rated for use on titanium as its primary workpiece material, reflecting the high-performance designation of the R41 series. Its web-thinned, tapered web configuration reduces thrust requirements and improves penetration at entry. The straight-cylindrical shank fits standard drill chucks across a wide range of machine tools, including drill presses, CNC machining centers, lathes, and screw machines. It is appropriate for machinists, tool and die technicians, and production shop personnel working within the 0.150 to 0.200 inch diameter range under ANSI standards.

Key Features

• 0.161 inch diameter (Wire Size 20) with 118-degree standard point for clean entry
• High-speed steel construction rated for titanium and general-purpose workpiece materials
• Web-thinned, tapered web reduces thrust and improves chip flow
• Screw machine (stub) length provides superior rigidity and reduced deflection
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for effective chip evacuation
• Bright/uncoated finish — compatible with a broad range of cutting fluids and lubricants
• Conforms to ANSI standards; R41 series high-performance designation

Compatibility

Designed as a general-purpose screw machine length drill bit for use across a range of machine tools accepting straight-cylindrical shanks, suitable for applications involving titanium and other metals within the 0.150 to 0.200 inch decimal inch size range per ANSI specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with machine tool operation. Ensure the drill chuck is fully secured and the workpiece is properly fixtured before operation. Apply appropriate cutting fluid for the workpiece material, particularly when drilling titanium, to manage heat buildup and extend tool life. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed.