Precision Twist Drill 5998543 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998543 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. It measures 0.213 inches in diameter (Wire Size 3) with an overall length of 2-3/8 inches and a flute length of 1-1/4 inches. Manufactured from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web construction that reduces walking and thrust force on entry. The straight-cylindrical shank fits standard chucks without modification. It is intended for right-hand cutting with a regular spiral flute pattern and is rated for heavy-duty use in production and maintenance environments.

This bit is engineered for use on titanium as the primary workpiece material, making it well suited for aerospace, precision machining, and metal fabrication tasks where tool performance and dimensional accuracy are critical. The screw machine length configuration provides added rigidity compared to jobber-length bits, which is an advantage when drilling in tight setups or on drill presses and CNC equipment. The 2.5xD flute-to-diameter ratio supports efficient chip evacuation during short-depth cycles. The R41C series meets ANSI and NAS 907 specifications, which is relevant for shops working to controlled standards.

Key Features

• 135-degree split point reduces drill walking and lowers required feed force
• Web-thinned, tapered web construction improves penetration on hard materials including titanium
• Screw machine length body adds rigidity over standard jobber-length bits
• High speed steel construction with coated finish for extended tool life
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI and NAS 907 specification requirements for controlled-standard environments

Compatibility

The 5998543 is rated for titanium as the primary workpiece material and belongs to the R41C series. It is designed as a screw machine length replacement or production drill bit for applications requiring ANSI and NAS 907 compliant tooling in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

This drill bit is installed by machinists and tool-and-die professionals in drill presses, lathes, and CNC machining centers. Secure the straight-cylindrical shank firmly in the chuck or collet before operation and verify runout is within acceptable limits. When drilling titanium or other hard metals, use appropriate cutting fluid and avoid excessive feed rates that can overheat the cutting edge. Inspect the bit for wear or chipping before each use and replace when point geometry is degraded.