Precision Twist Drill 5996063 Cobalt Drill Bit 0.4688 in

Product Description

The PRECISION TWIST DRILL 5996063 is a screw machine length cobalt drill bit designed for drilling into hard and abrasive materials where standard high-speed steel bits fall short. Measuring 0.4688 inches (15/32 inches) in diameter with an overall length of 3-5/8 inches and a flute length of 2-1/8 inches, this bit belongs to the M40CO series and is built to heavy-duty performance standards. The 135-degree split point reduces walking at start and requires less thrust to penetrate, making it well suited for production and maintenance drilling applications. It meets ANSI specifications and carries a coated finish to extend tool life under demanding conditions.

This drill bit is intended for use on hard workpiece materials including stainless steel, hardened alloys, and other difficult-to-machine metals. The screw machine length configuration — shorter than jobber length — provides added rigidity and reduced deflection, which is especially useful in drill press, CNC, and turret lathe setups where tool overhang must be minimized. The 2.5xD flute-to-diameter ratio supports efficient chip evacuation in these high-feed environments. Machinists, tool-and-die workers, and maintenance technicians working in metalworking shops or industrial maintenance settings are the primary users.

Key Features

• Cobalt (M40 material grade) construction provides heat resistance and edge retention in hard materials
• 135-degree split point reduces thrust requirements and minimizes drill walking on entry
• Screw machine length body adds rigidity and reduces deflection compared to jobber length bits
• Web-thinned, tapered web configuration improves cutting efficiency and chip flow
• Regular spiral, spiral flute design with 2.5xD flute ratio supports consistent chip evacuation
• Straight-cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as a screw machine length replacement or production bit for use in drill presses, CNC machining centers, turret lathes, and hand-held drill equipment with standard straight-shank chuck capacity accommodating a 0.4688-inch diameter tool. Fits within the 0.4500 to 0.5000 inch drill bit size range of the M40CO series.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tool safety. Secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet before operation, and confirm the setup is fully tightened before applying feed pressure. Always wear appropriate eye protection and follow shop safety protocols when operating drilling equipment. Inspect the cutting edges for wear or chipping before each use and replace the bit if damage is present.