Precision Twist Drill 5996005 7/64 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996005 is a cobalt screw machine length drill bit designed for drilling into hard and abrasive materials where standard high-speed steel bits fall short. Built to the M40CO series specification, it features a 7/64 inch (0.1094 inch) diameter, a 135-degree split point for self-centering starts, and a web-thinned, tapered-web construction that reduces thrust and improves chip evacuation. The straight-cylindrical shank seats securely in standard drill chucks. At 1-13/16 inches overall length with a 13/16 inch flute, this stub-length geometry provides added rigidity for precision work in tight spaces. It meets ANSI standards and is rated heavy duty for demanding production and maintenance applications.

This bit is suited for machinists, maintenance technicians, and metalworking professionals who regularly drill stainless steel, hardened alloys, titanium, and other hard materials. The screw machine length format makes it a practical choice for drill presses, CNC machines, and hand-held operations where a shorter, stiffer bit reduces deflection. The right-hand spiral flute design pulls chips away from the cutting zone during through-hole drilling. Applications include fabrication shops, machine shops, and industrial maintenance environments that require a reliable cobalt bit for repeated hard-material work.

Key Features

• Cobalt construction rated for hard and abrasive workpiece materials including stainless steel and hardened alloys
• 135-degree split point for self-centering entry without a center punch on most materials
• Web-thinned, tapered-web design reduces drilling thrust and improves chip flow
• Screw machine (stub) length at 1-13/16 inches overall for maximum rigidity and reduced deflection
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip evacuation
• ANSI-compliant, heavy duty grade, M40 material grade

Compatibility

Designed as an OEM-style replacement or direct-use cobalt stub drill for industrial and maintenance applications requiring a 7/64 inch diameter screw machine length bit compatible with standard straight-shank drill chucks.

Installation Notes

Install in a drill press, CNC spindle, or keyed hand-drill chuck rated for straight-cylindrical shanks. Confirm the chuck is fully tightened and the bit is seated squarely before operation. Use appropriate cutting fluid or coolant when drilling hardened steels to preserve bit life and workpiece integrity. Follow applicable shop safety procedures and wear eye protection during all drilling operations.