Precision Twist Drill 5998606 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998606 is a screw machine length drill bit designed 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 a web-thinned, tapered web configuration that reduces thrust and improves penetration. The straight-cylindrical shank measures 0.185 inches in diameter, and the overall length is 2-3/16 inches with a flute length of 1-1/8 inches. The right-hand spiral flute geometry suits production drilling environments where shorter stub-length tools are required for rigidity and precision. HVAC fabricators, pipefitters, and metalworking trades reach for screw machine bits when working in tight clearances or on drill press and CNC setups.

This bit is rated for primary use in titanium and is built to ANSI and NAS 907 specifications, placing it in the heavy-duty, high-performance tier. The R41C series is a short-length, coated HSS line suited to production drilling where hole location accuracy and tool life are priorities. The 2.5xD flute-to-diameter ratio provides chip clearance without sacrificing tool stiffness. It is sold individually but carries a minimum order quantity of 12 units, making it well suited for shop stocking or job-lot ordering by machine shops, fabrication contractors, and maintenance teams.

Key Features

• 0.185 inch (No. 13 wire gauge) diameter with straight-cylindrical shank for secure chuck grip
• 135-degree split point with web thinning reduces walking and lowers drilling thrust
• High speed steel construction with coated finish for extended tool life
• Screw machine (stub) length at 2-3/16 inches overall for improved rigidity in short-reach setups
• Right-hand spiral flute with 2.5xD ratio promotes chip evacuation during production runs
• Meets ANSI and NAS 907 standards; rated for titanium and other demanding workpiece materials

Compatibility

Designed as an OEM-style replacement or production-stock drill bit for use in standard drill presses, CNC machining centers, and hand-held drilling equipment accepting straight-cylindrical shanks in the 0.1500 to 0.2000 inch diameter range.

Installation Notes

Secure the straight shank fully in a drill chuck or collet before operation and verify there is no runout. Power down all equipment before bit changes. When drilling titanium or hard alloys, use appropriate cutting fluid to manage heat and extend bit life. Follow applicable shop safety standards and manufacturer feed-rate guidelines for the workpiece material.