Precision Twist Drill 5999390 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999390 is a screw machine length drill bit engineered for high-performance metal drilling applications. Built 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 cutting resistance on entry. At 0.29 inches in diameter with an overall length of 2.75 inches and a flute length of 1.5625 inches, it fits compact drilling setups where standard-length bits are too long. The right-hand spiral flute and straight cylindrical shank make it compatible with standard drill chucks. It is rated for heavy-duty use and carries ANSI and NAS 907 designations.

This bit is designed for drilling titanium and other demanding workpiece materials in production and maintenance environments. The screw machine length profile suits drill presses, CNC machines, and hand-held power tools in tight clearance applications. The R42C series targets high-performance cutting where shorter flute-to-diameter ratios and aggressive point geometry are required. Machinists, tool-and-die technicians, and HVAC or mechanical contractors working with hard metals will find this bit appropriate for precision hole making in confined spaces.

Key Features

• 135-degree split point with web thinning reduces thrust and prevents bit walking on hard materials
• High speed steel construction with coated finish for extended tool life in demanding cuts
• Screw machine length body at 2.75 inches overall for use in tight clearance applications
• Regular spiral flute with 2.5xD flute-to-diameter ratio promotes chip evacuation
• Straight cylindrical shank fits standard three-jaw drill chucks without adapters
• Meets ANSI and NAS 907 standards for heavy-duty drill bit performance

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for applications requiring a 0.29-inch diameter hole in titanium or similarly hard workpiece materials, within the 0.25-inch to 0.30-inch size range of the R42C series.

Installation Notes

Install this bit into a properly rated drill chuck and confirm the shank is fully seated before operation. Power down or de-energize all machinery before changing tooling. Use appropriate cutting fluid or coolant when drilling titanium to manage heat buildup and extend tool life. Follow applicable shop safety standards and manufacturer guidelines for spindle speed and feed rate selection based on workpiece material and setup rigidity.