Precision Twist Drill 5998549 Drill Bit 55/64 in Hss

Product Description

The PRECISION TWIST DRILL 5998549 is a screw machine length drill bit designed for high-performance metal drilling applications. Built from high-speed steel (HSS) with a coated finish, this bit features a 118-degree standard point angle and a web-thinned, tapered web configuration for improved cutting efficiency and reduced thrust. At 55/64 inches (0.8594 inches) in diameter with a 5-1/2 inch overall length and a 3-1/2 inch flute length, it fits standard drill chucks and machines via its straight-cylindrical shank. It is rated for right-hand cut operation and conforms to ANSI standards.

This Series R40 drill bit is rated for use on titanium and other demanding workpiece materials, making it suitable for aerospace, machining, and industrial fabrication environments. The screw machine length format — shorter than jobber length — provides added rigidity and reduced deflection in drill press, CNC, and turret lathe setups. Machinists, tool-and-die shops, and maintenance professionals working with hard or abrasive metals will find this bit appropriate for both production and general-purpose drilling tasks.

Key Features

• 55/64 inch (0.8594 inch) diameter with straight-cylindrical shank of matching diameter
• 118-degree standard point angle for general-purpose entry performance
• Web-thinned tapered web reduces cutting resistance and improves chip clearance
• Screw machine length provides extra rigidity over jobber-length bits in tight setups
• High-speed steel construction with coated finish for wear resistance
• Right-hand cut, spiral flute, 2.5xD flute-to-diameter ratio for effective chip evacuation
• Conforms to ANSI standards; rated for titanium and other high-performance workpiece materials

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for industrial drilling applications requiring a 55/64 inch diameter HSS bit with a straight-cylindrical shank conforming to ANSI Series R40 specifications.

Installation Notes

This drill bit is installed by machinists and tooling professionals in drill press, CNC, or turret lathe equipment. Before mounting, ensure the spindle and chuck are fully powered down and secured. Verify chuck capacity accommodates the 0.8594 inch shank diameter before tightening. When drilling titanium or similarly hard materials, use appropriate cutting fluid and feed rates per the machine manufacturer's guidelines to prevent premature tool wear.