Precision Twist Drill 5998623 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998623 is a screw machine length drill bit designed for high-performance drilling in titanium and other demanding materials. It measures 0.07 inches in diameter with an overall length of 1-11/16 inches and a flute length of 11/16 inches. The bit is manufactured from high speed steel with a coated finish and features a 135-degree split point for fast penetration and reduced walking on entry. A web-thinned, tapered web configuration lowers thrust requirements, making this bit well suited for production drilling applications where cycle time and hole quality matter.

This bit is built for machining environments where tight tolerances and difficult workpiece materials are the norm. The screw machine length format provides added rigidity compared to jobber-length bits, which reduces deflection in short-hole applications. It is a common choice for use in drill presses, CNC machining centers, and manual screw machines. The R41C series is rated for heavy-duty use and carries ANSI and NAS 907 designations, making it appropriate for aerospace, industrial fabrication, and precision manufacturing shops.

Key Features

• 135-degree split point reduces thrust and eliminates center punching on most materials
• Web-thinned tapered web lowers cutting resistance and improves chip evacuation
• High speed steel construction with coated finish extends tool life in abrasive and high-heat cuts
• Screw machine length body adds rigidity and reduces deflection in short-hole drilling
• Right hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal
• Meets ANSI and NAS 907 standards for dimensional and performance consistency

Compatibility

Designed as a heavy-duty OEM-style drill bit for use in standard straight-shank chuck systems compatible with 0.07-inch diameter tooling. Primary workpiece material rating is titanium; also suitable for other high-strength metals in production drilling setups.

Installation Notes

This bit is installed by a machinist or tool-and-die professional using a drill chuck or collet rated for straight-cylindrical shanks. Ensure the chuck is fully tightened and the shank is seated squarely before operation. Use appropriate cutting fluid or coolant for the workpiece material, particularly when drilling titanium, to manage heat buildup and extend tool life. Inspect the cutting edge for wear or chipping before each use and replace the bit if the split point shows signs of degradation.