Precision Twist Drill 5996071 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996071 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to the M40CO series specification, it features a 135-degree split point for fast, accurate starts without a center punch. The straight-cylindrical shank and web-thinned, tapered web construction reduce thrust requirements and improve chip evacuation. At 0.5313 inches (17/32) in diameter with an overall length of 3.875 inches and a flute length of 2.375 inches, this bit is sized for stub-length rigidity. It is suited for machinists, tool-and-die workers, and maintenance technicians who need reliable performance in production or repair environments.

This bit is built for use on hard workpiece materials including alloy steels, stainless steels, and other tough metals where standard high-speed steel bits fall short. The screw machine length format provides added rigidity compared to jobber-length bits, making it well suited for drill press, CNC, and turret lathe applications where minimizing deflection is critical. Right-hand cut spiral flutes channel chips away from the cutting zone during through-hole and blind-hole operations. The 2.5xD flute-to-diameter ratio supports consistent chip flow at production feed rates.

Key Features

• Cobalt tool material rated for heavy-duty drilling in hard and abrasion-resistant workpiece materials
• 135-degree split point for self-centering starts and reduced thrust
• Web-thinned tapered web lowers feed force and extends tool life
• Screw machine (stub) length increases rigidity and minimizes deflection
• Right-hand cut regular spiral flutes promote efficient chip evacuation
• Meets ANSI standards; M40 material grade designation

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for applications requiring a 0.5313 inch (17/32) diameter screw machine length bit with a straight-cylindrical shank, compatible with standard drill chucks and collet systems that accept that shank diameter.

Installation Notes

This bit should be installed and operated by qualified machinists or maintenance technicians familiar with metal-cutting tooling. Ensure the machine spindle and chuck are fully powered down and locked out before mounting or removing the bit. Confirm chuck or collet capacity matches the straight-cylindrical shank diameter before securing. Use appropriate cutting fluid for the workpiece material to manage heat and extend bit life.