Precision Twist Drill 5996642 Taper Length Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 5996642 is a taper length cobalt drill bit in the M51CO series, designed for high-performance drilling in demanding metalworking applications. Sized at 23/64 inches (0.3594 inches decimal) in diameter, the bit features a 135-degree split point for accurate self-centering entry without a center punch. The cobalt construction with a gold oxide finish provides heat resistance and extended tool life when cutting hard or abrasive materials. With a 4-1/4-inch spiral flute length and a 6-3/4-inch overall length, this bit handles deeper-reach applications where a standard-length bit falls short. It is installed by machinists, toolroom technicians, and fabricators working with drill presses, CNC machines, and hand-held power drills.

The 5996642 is suited for drilling alloy steel, carbon steel, stainless steel, cast iron, hardened steel, aluminum, brass, bronze, copper, nickel alloys, magnesium, and reinforced plastics. The taper length body gives extra reach compared to jobber-length bits, making it a common choice in structural fabrication, maintenance shops, and machine shops where through-hole depth or clearance requires a longer shank-to-flute profile. The straight cylindrical shank fits standard drill chucks and collet holders without adapters.

Key Features

• Cobalt tool material with gold oxide finish for heat resistance and extended wear life
• 135-degree split point enables self-centering entry and reduces walking on hard surfaces
• Taper length body at 6-3/4 inches OAL provides added reach over standard jobber bits
• 4-1/4-inch spiral flute length with 6xD flute-to-diameter ratio for efficient chip evacuation
• Web-thinned, tapered web configuration reduces thrust and improves cutting efficiency
• Right-hand cut, straight cylindrical shank fits standard chucks without modification
• Meets ANSI standards; rated heavy-duty for demanding production and maintenance use

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit compatible with any standard drill chuck or collet system accepting a 0.3594-inch straight cylindrical shank. Suitable for use in drill presses, milling machines, CNC machining centers, and hand-held power drills across industrial and fabrication environments.

Installation Notes

Installation is performed by machinists or fabricators familiar with drill press or CNC machine setup. Secure the straight shank firmly in a properly sized chuck or collet before operation and verify concentricity to minimize runout. Always wear appropriate eye protection and follow applicable shop safety procedures when drilling metal. Ensure the workpiece is clamped securely before beginning the cut to prevent bit walking or workpiece movement.