Precision Twist Drill 5996008 Cobalt Drill Bit 9/16 in

Product Description

The PRECISION TWIST DRILL 5996008 is a screw machine length cobalt drill bit designed for drilling hard and abrasive materials in demanding production environments. Built to the M40CO series specification, it features a 135-degree split point for reduced walking and faster penetration without a center punch. The straight-cylindrical shank seats securely in standard drill chucks or screw machine spindles. At 9/16 inch (0.5625 inches) in diameter with a 2.5 inches flute-to-diameter ratio, this bit is engineered for high-performance material removal in heavy-duty applications.

This drill bit is suited for metalworking applications involving hard ferrous and non-ferrous materials where standard high-speed steel bits wear prematurely. The screw machine length profile offers a shorter, more rigid geometry than jobber-length bits, reducing deflection during drilling operations on CNC machines, drill presses, and turret lathes. The web-thinned, tapered web construction improves chip evacuation and lowers thrust requirements, making it a practical choice for production machinists working with tough alloys.

Key Features

• 9/16 inch (0.5625 inches) diameter cobalt construction for heat and wear resistance in hard materials
• 135-degree split point reduces walking and eliminates the need for a center punch on most setups
• Screw machine length geometry provides added rigidity and reduced deflection versus jobber-length bits
• Web-thinned tapered web promotes efficient chip evacuation and lower cutting thrust
• Right-hand spiral flute cutting action compatible with standard drill press and CNC setups
• Meets ANSI standards under M40CO series designation

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machines, drill presses, CNC machining centers, and turret lathes accepting straight-cylindrical shank tooling in the 0.5000 to 0.6000 inch diameter range.

Installation Notes

This bit is installed by a machinist or tool-and-die professional. Ensure the drill press or machine spindle is fully powered down and locked out before changing tooling. Secure the straight-cylindrical shank firmly in the chuck or collet to the full grip depth to prevent slippage under load. Do not exceed the recommended feed and speed parameters for the workpiece material when using cobalt tooling.