Precision Twist Drill 5999305 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999305 is a screw machine length drill bit designed for high-performance drilling in tight-tolerance applications. Built from high speed steel (HSS) with a bright/uncoated finish, this bit measures 0.204 inches in diameter (Wire Size 6) and carries an overall length of 2.375 inches with a 1.25-inch flute length. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve chip clearance. Licensed machinists, tool and die workers, and HVAC fabrication technicians are the primary installers of this tooling.

This bit is suited for screw machine and production drilling operations where a shorter, stiffer tool body minimizes deflection and improves hole accuracy. The Series R41 designation places it in a high-performance HSS lineup built to ANSI standards. Its 2.5xD flute-to-diameter ratio provides efficient chip evacuation. The straight-cylindrical shank fits standard 3-jaw drill chucks found on bench drill presses, CNC drilling centers, and screw machines. The primary workpiece material rating is titanium, though general-purpose use across ferrous and non-ferrous metals is supported.

Key Features

• 0.204 inch (Wire Size 6) diameter for close-tolerance hole sizing
• High speed steel construction rated for titanium and general-purpose metals
• 118-degree standard point angle with web-thinned tapered web for reduced thrust
• Screw machine length body at 2.375 inches overall for improved rigidity
• Right-hand spiral flute with 2.5xD ratio for efficient chip removal
• Bright/uncoated finish suitable for use with cutting fluids
• Meets ANSI standards, Series R41

Compatibility

Designed as an OEM-style replacement or direct-fit tooling option for standard 3-jaw drill chuck setups accepting a straight-cylindrical shank. Fits screw machines, bench drill presses, and CNC drilling centers configured for screw machine length drill bits in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

Installation of this drill bit requires a properly sized 3-jaw or collet chuck rated for straight-cylindrical shanks. Always power down and lock out the drilling machine before changing tooling. Secure the shank fully within the chuck jaws to prevent slippage and runout. Use appropriate cutting fluid when drilling titanium or hardened ferrous materials to extend tool life and maintain hole quality.