Precision Twist Drill 5998679 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998679 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Manufactured from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web design that reduces walking and cutting pressure at the start of each hole. The 0.199-inch (No. 8 wire gauge) diameter and compact 2.25-inch overall length make it well suited for work in tight clearances where a jobber-length bit would be impractical. The Series R41C construction meets ANSI and NAS 907 specifications, confirming dimensional and performance standards for heavy-duty shop use.

This drill bit is designed for drilling titanium as its primary workpiece material, making it appropriate for aerospace, precision machining, and mechanical trade applications where hard or work-hardening materials are encountered. The straight-cylindrical shank seats securely in standard drill chucks and machine spindles. With a flute-to-diameter ratio of 2.5xD and a 1.1875-inch spiral flute length, it provides reliable chip evacuation during through-hole and blind-hole operations. It is sold individually but requires a minimum order quantity of 12 units.

Key Features

• 135-degree split point reduces bit walking and lowers required feed force
• Web-thinned, tapered web design improves cutting efficiency in hard materials including titanium
• High speed steel construction with coated finish extends tool life under heat and friction
• Screw machine (stub) length of 2.25 inches overall provides rigidity and fits tight workspaces
• Straight-cylindrical shank compatible with standard drill chucks and CNC machine spindles
• Meets ANSI and NAS 907 standards for heavy-duty, high-performance drill bit classification

Compatibility

Designed as a screw machine length replacement or production drill bit for applications involving titanium and similar hard metals; fits any standard drill chuck or spindle accepting a straight-cylindrical shank at 0.199 inches diameter.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drill press, CNC, or hand-drill operation. Ensure the machine spindle or chuck is fully stopped and locked out before inserting or removing the bit. Use appropriate cutting fluid or coolant to manage heat when drilling titanium or other hard metals, as this bit does not support coolant-through delivery. Secure the workpiece firmly before drilling to prevent movement and bit deflection.