Precision Twist Drill 5999448 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999448 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and a web-thinned, tapered web configuration that reduces thrust and improves centering on entry. The straight-cylindrical shank measures 0.4375 inches in diameter with an overall length of 3-7/16 inches and a flute length of 2-1/16 inches. The right-hand spiral flute design promotes clean chip evacuation. Manufactured to ANSI and NAS 907 specifications, this is a heavy-duty bit suited for machinists, pipefitters, and fabricators working in production or repair environments.

This drill bit is rated for primary use in titanium workpieces, making it appropriate for aerospace fabrication, industrial maintenance, and other applications where difficult-to-machine materials are common. The screw machine length format provides added rigidity over jobber-length bits, which is particularly useful in drill press and turret lathe setups where shorter reach reduces deflection and improves hole accuracy. The Series R40C designation places this bit within a heavy-duty, high-performance product line built to ANSI and NAS standards.

Key Features

• 135-degree split point reduces walking and improves self-centering on hard materials
• Web-thinned, tapered web lowers cutting thrust and extends tool life in tough alloys
• High speed steel construction with coated finish for improved wear resistance
• Screw machine length for increased rigidity and reduced deflection vs. jobber-length bits
• Right-hand spiral flute promotes efficient chip evacuation
• Meets ANSI and NAS 907 specifications for dimensional consistency

Compatibility

Designed for drilling titanium as the primary workpiece material; also suitable for general high-performance drilling applications where a heavy-duty screw machine length bit is required. Compatible with standard drill presses, turret lathes, and CNC equipment accepting a straight-cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with cutting tool setup and safe machine operation. Secure the straight-cylindrical shank firmly in the chuck or collet before beginning any cut, and confirm that the machine is powered off and locked out before tooling changes. Use appropriate cutting fluid or coolant for titanium workpieces to manage heat buildup, as this bit does not feature through-coolant capability. Follow applicable ANSI machine safety standards and shop-specific procedures for rotating equipment.