Precision Twist Drill 5999342 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999342 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, this bit features a 135-degree split point and web-thinned, tapered web geometry for fast penetration and reduced walking on entry. The straight-cylindrical shank provides a secure grip in standard drill chucks. At 0.238 inches in diameter with an overall length of 2.5 inches and a flute length of 1.375 inches, this is a compact, stub-length bit suited for close-quarters and precision work. It meets ANSI and NAS 907 specifications and is rated for heavy-duty use.

This drill bit is designed for use in screw machine operations, CNC drilling setups, and hand-held or press drilling where a shorter flute length improves rigidity and accuracy. Its primary rated workpiece material is titanium, making it appropriate for aerospace, maintenance, and specialty fabrication work where standard bits underperform. The regular spiral flute with a 2.5xD flute-to-diameter ratio handles chip evacuation efficiently in these harder materials. Machinists, maintenance technicians, and fabricators working in metalworking environments are the typical users of this series.

Key Features

• 135-degree split point reduces thrust and prevents bit walking on hard materials
• Web-thinned, tapered web geometry improves cutting efficiency in titanium and tough alloys
• High speed steel construction with coated finish for wear resistance
• Screw machine length (stub) provides greater rigidity than jobber-length bits
• Right-hand cut, regular spiral flute for efficient chip evacuation
• Meets ANSI and NAS 907 standards for dimensional and performance compliance

Compatibility

Designed as a screw machine length drill bit in Series R42C, sized at letter B (0.238 inches), falling within the 0.2000 to 0.2500 inch drill bit size range. Intended for use with standard straight-shank drill chucks compatible with that diameter range.

Installation Notes

Install and remove this bit only with the machine or drill press fully powered down and the chuck secured. Use appropriate cutting fluid or lubricant when drilling titanium or hard alloys to extend bit life and control heat buildup. Ensure the chuck is properly tightened on the straight-cylindrical shank before operation. Follow applicable ANSI machining safety guidelines and shop-specific procedures for drill press or CNC setup.