Precision Twist Drill 5996280 Taper Length Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 5996280 is a taper length cobalt drill bit designed for heavy-duty metal drilling applications. Built from cobalt tool material with a coated finish, this bit features a 135-degree notched split point that reduces walking and allows self-centering entry without a center punch. The straight shank measures 0.5156 inches (33/64 inch) in diameter, and the overall length is 8 inches with a spiral flute length of 4.75 inches. The tapered web configuration and web-thinned geometry reduce thrust requirements and improve chip evacuation. Licensed trades and industrial machinists rely on this bit where standard high-speed steel bits fail under heat or work-hardened conditions.

This drill bit is suited for production and maintenance drilling in ferrous and non-ferrous metals across a wide range of material hardnesses. Rated for use in 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, cermet, graphite, and reinforced plastic materials. It is appropriate for both manual drill press setups and CNC machine applications where a straight shank taper length bit is specified. The 6xD flute-to-diameter ratio provides added reach beyond standard length bits without sacrificing rigidity.

Key Features

• Cobalt tool material for extended tool life in hard and abrasive materials
• 135-degree notched split point for self-centering entry and reduced thrust
• Taper length design provides additional reach with a 4.75-inch spiral flute
• Web-thinned tapered web configuration improves chip flow and reduces heat buildup
• Right-hand cut with regular spiral flute geometry for standard drilling operations
• Meets ANSI standards; heavy-duty grade construction

Compatibility

The PRECISION TWIST DRILL 5996280 is part of the M51CO series and is compatible with any drill press, mill, or CNC machine tool accepting a straight shank bit at 0.5156 inches (33/64 inch) diameter. Suitable for use across the full material application list stated by the manufacturer including alloy steel, stainless steel, aluminum, brass, bronze, copper, cast iron, nickel alloys, magnesium alloys, and reinforced plastics.

Installation Notes

This bit is installed by machinists, tool-and-die professionals, or industrial maintenance technicians using a compatible drill press, milling machine, or CNC spindle with an appropriate chuck or collet rated for a straight shank. Ensure the machine is fully powered down and locked out before changing tooling. Secure the shank firmly in the chuck to the full depth of the chuck jaws to prevent runout or slippage under load. Use appropriate cutting fluid or coolant compatible with the workpiece material to preserve tool life, noting that this bit does not support through-coolant delivery.