Precision Twist Drill 5999386 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999386 is a screw machine length drill bit designed for high-performance metal drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, it features a 135-degree split point and web-thinned geometry that reduces walking and thrust when starting a hole. The straight-cylindrical shank measures 0.281 inches (9/32 inch) in diameter, and the overall length is 2-11/16 inches with a 1-1/2 inch flute length. The compact screw machine length body makes it well-suited for operations requiring close-quarters drilling or work in drill presses and CNC equipment.

This bit is rated for drilling titanium as its primary workpiece material, making it a heavy-duty choice where standard jobber-length bits fall short on performance. The R42C series follows ANSI and NAS 907 specifications, confirming dimensional and performance compliance for shop and production environments. The 2.5xD flute-to-diameter ratio supports efficient chip evacuation in short-depth holes. Machinists, toolroom technicians, and maintenance trades working with hard or exotic metals will find this bit appropriate for precision drilling tasks.

Key Features

• 135-degree split point reduces thrust and eliminates center-punch requirements on most materials
• Web-thinned, tapered web configuration improves cutting efficiency and lowers heat buildup
• High speed steel construction with coated finish extends tool life in high-wear applications
• Screw machine length (2-11/16 inches overall) provides rigidity and reduced deflection versus jobber-length bits
• Right-hand spiral flute promotes smooth chip evacuation in standard drill press and handheld operations
• Meets ANSI and NAS 907 standards for dimensional consistency across production use

Compatibility

Designed as a heavy-duty OEM-style screw machine drill bit for use with standard straight-shank drill chucks on drill presses, CNC machining centers, and portable electric drills. Primary workpiece material rating is titanium; suitable for other hard metals within the appropriate speed and feed parameters for high speed steel tooling.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with proper speeds, feeds, and cutting fluid application for high speed steel tooling. Secure the straight-cylindrical shank fully in the chuck before operation to prevent runout or ejection. Always wear appropriate eye protection and ensure the workpiece is firmly clamped. Do not exceed the recommended cutting speed for the workpiece material, as overheating will reduce tool life and may cause premature failure.