Precision Twist Drill 5995994 Cobalt Drill Bit 0.625 in

Product Description

The PRECISION TWIST DRILL 5995994 is a screw machine length cobalt drill bit designed for high-performance drilling in hard and tough workpiece materials. Built to ANSI standards, it features a 0.625-inch diameter with a 135-degree split point that reduces thrust and improves centering on contact. The web-thinned, tapered web construction and right-hand spiral flute geometry support efficient chip evacuation. At 4.25 inches overall length with a 2.75-inch flute length, this short-series bit delivers rigid, chatter-resistant performance in drill press, CNC, and screw machine applications. Installation and setup are handled by machinists and tool-room technicians working in production or job-shop environments.

This bit is rated for hard materials and is well suited for production drilling operations where a standard jobber-length bit would introduce excessive deflection or chatter. The straight-cylindrical shank fits standard drill chucks without requiring specialized toolholding. The M40CO series designation indicates a heavy-duty cobalt grade formulated for heat resistance, making it appropriate for stainless steel, hardened alloys, and other difficult-to-machine metals where high-speed steel bits lose their edge prematurely.

Key Features

• 0.625-inch diameter cobalt construction for heat and wear resistance in hard materials
• 135-degree split point reduces entry thrust and improves self-centering
• Web-thinned, tapered web design promotes efficient chip evacuation
• Screw machine (stub) length at 4.25 inches overall provides rigidity and minimizes runout
• 2.75-inch flute length at a 2.5xD flute-to-diameter ratio balances chip clearance with stiffness
• Right-hand cut spiral flute; straight-cylindrical shank fits standard drill chucks
• Meets ANSI standards; M40CO heavy-duty cobalt grade

Compatibility

Designed as an OEM-compatible replacement or direct-use drill bit for any application requiring a 0.625-inch diameter screw machine length cobalt drill bit with a straight-cylindrical shank and ANSI-standard geometry. No coolant-through capability; suitable for dry or externally lubricated drilling setups.

Installation Notes

Secure the straight-cylindrical shank firmly in a keyed or keyless drill chuck before operation; verify runout with a dial indicator on precision setups. De-energize and lock out the machine before inserting or removing the bit. Apply cutting fluid appropriate for the workpiece material to extend tool life and maintain surface finish. Inspect the cutting edges and split point for chipping or wear before each use, and replace when edge integrity is compromised.