Precision Twist Drill 5998603 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998603 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, it measures 0.189 inches (No. 12 wire gauge) in diameter and carries a 135-degree split point for fast, self-centering starts with minimal walking. The shortened screw machine length body provides added rigidity in drill press and CNC applications. A web-thinned, tapered web design reduces thrust force and improves chip evacuation through the spiral flute. This bit is rated for heavy-duty service and complies with ANSI and NAS 907 standards.

The 5998603 is designed for precision drilling in titanium as its primary workpiece material, making it well suited for aerospace, industrial maintenance, and mechanical trade applications where tight tolerances and clean entry holes are required. The right-hand cut and regular spiral flute handle chip clearance efficiently in deep and interrupted cuts. Machinists and maintenance technicians working with screw machines, drill presses, and CNC equipment will find the R41C series geometry appropriate for production runs and repetitive hole-making tasks where bit stability and point accuracy are critical.

Key Features

• 135-degree split point with web thinning for self-centering starts and reduced thrust
• High speed steel construction with coated finish for extended wear resistance
• Screw machine length body provides rigidity compared to jobber-length bits
• Regular spiral flute at 2.5xD ratio supports efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without modification
• Complies with ANSI and NAS 907 specifications for dimensional accuracy

Compatibility

Designed as an OEM-style screw machine drill bit in the R41C series, sized for use in standard drill chucks and collets accepting a straight-cylindrical shank at 0.189 inches diameter, with a primary application in titanium workpieces per series specification.

Installation Notes

Installation and use should be performed by qualified machinists or trained maintenance technicians familiar with drill press, CNC, or screw machine operation. Secure the workpiece firmly before drilling and confirm chuck or collet is tightened to the manufacturer specification for the machine in use. Because this bit is rated for titanium, use appropriate cutting fluid or coolant to manage heat buildup and extend cutting edge life. Inspect the split point for chipping or wear before each use, and replace the bit if point geometry is compromised.