Precision Twist Drill 5996650 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5996650 is a taper length cobalt drill bit designed for heavy-duty drilling in a wide range of materials. Built from cobalt tool steel, it delivers high heat and wear resistance in demanding production and job-site environments. The bit features a 135-degree notched point with web thinning for self-centering entry without a center punch, and a right-hand spiral flute that clears chips efficiently during through-hole drilling. At 25/32 inch (0.7812 inches) in diameter with a 6-inch flute length, it handles deeper bores than jobber-length bits without sacrificing rigidity. Installed by machinists and fabricators in standard drill chucks or drill presses.

This bit is suited for use on alloy steel, carbon steel, stainless steel, hardened steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, high strength bronze, copper, magnesium, magnesium alloy, nickel, nickel alloy, cermet, graphite, and reinforced plastic materials. The taper length profile makes it a practical choice when jobber-length bits fall short and full-length extensions are not necessary. Typical applications include structural fabrication, maintenance and repair operations, and production drilling on ferrous and non-ferrous stock.

Key Features

• Cobalt tool steel construction for high heat resistance and extended tool life in tough materials
• 135-degree notched point with web thinning for self-centering starts and reduced thrust
• 6-inch flute length (6xD ratio) provides deep-hole capacity beyond standard jobber-length bits
• Right-hand spiral flute with tapered web for efficient chip evacuation
• Straight shank at 0.7812 inches fits standard three-jaw drill chucks
• Coated finish for added surface hardness and lubricity
• Meets ANSI standards; rated heavy-duty grade

Compatibility

Designed as an OEM-style taper length drill bit compatible with standard straight-shank drill chucks and drill press spindles accepting a 25/32 inch shank. Suited for Series M51CO cobalt tooling applications per ANSI standards.

Installation Notes

Installation is performed by machinists or qualified fabricators using a drill press, CNC machine, or heavy-duty hand drill with a properly rated chuck. Ensure the workpiece is securely clamped before beginning any drilling operation. Use appropriate cutting fluid or coolant for ferrous materials to extend tool life, even though this bit does not support coolant-through delivery. Inspect the cutting edges for wear or chipping before each use and replace the bit if damage is found.