Precision Twist Drill 5996275 Taper Length Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 5996275 is a taper length cobalt drill bit designed for demanding metalworking and fabrication applications. Built to Series M51CO standards, it features a 31/64 inch (0.4844 inch decimal) diameter, a 135-degree split point for self-centering entry, and a web-thinned, tapered web configuration that reduces cutting resistance. The cobalt tool material with a gold oxide finish delivers heat resistance and edge retention in tough materials. At 7-3/4 inches overall length with a 4-3/4 inch flute length, this bit is suited for reaching deeper holes than standard jobber-length drills. Machinists, tool-and-die workers, and maintenance technicians working with hard or abrasive materials rely on this geometry for consistent, accurate holes.

This taper length drill bit is rated for use across a broad range of materials including alloy steel, carbon steel, stainless steel, hardened steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, high-strength bronze, copper, nickel, nickel alloy, magnesium, magnesium alloy, reinforced plastic, graphite, and cermet. Its heavy-duty grade and high-performance classification make it appropriate for both production machining environments and repair-and-maintenance work where material hardness and hole depth present challenges to standard drill bits.

Key Features

• Cobalt tool material with gold oxide finish for elevated heat resistance and extended tool life in hard metals
• 135-degree split point with web thinning enables self-centering starts without a center punch on most materials
• Taper length body provides added reach at 7-3/4 inches OAL compared to standard jobber-length bits
• Straight cylindrical shank fits standard drill chucks and machine tool spindles without adapters
• Regular spiral flute with 6xD flute-to-diameter ratio promotes chip evacuation in deeper holes
• Right-hand cutting direction, ANSI standard compliant

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit compatible with standard straight-shank drill chucks and spindles accepting a 31/64 inch shank diameter. Suitable for use in drill presses, milling machines, CNC machining centers, and handheld power tools equipped with appropriate chuck capacity.

Installation Notes

This bit is installed and operated by machinists, tool-and-die technicians, and maintenance professionals using standard drill press or machine tool setups. Secure the straight shank firmly in a drill chuck or collet before operation and confirm the workpiece is properly clamped. When drilling hardened or stainless steel, use appropriate cutting fluid to manage heat and extend bit life. Inspect the cutting edges for wear before each use and replace when point geometry degrades to prevent workpiece damage.