Precision Twist Drill 5996574 Taper Length Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 5996574 is a taper length cobalt drill bit designed for demanding hole-making applications across a wide range of materials. Built from cobalt tool steel, this bit features a 135-degree split point that reduces walking and enables self-centering without a center punch. The straight shank measures 0.2500 inches in diameter, with a flute length of 3-3/4 inches and an overall length of 6-1/8 inches. Right-hand spiral fluting with a 6xD flute-to-diameter ratio promotes efficient chip evacuation. This bit is suited for professional machinists, maintenance technicians, and fabricators working on production or repair tasks that require a longer reach than a jobber-length bit provides.

This taper length bit is intended for use in drill presses, CNC machining centers, and hand-held power drills where deeper hole penetration or longer reach is needed. The M51CO series designation indicates a heavy-duty cobalt construction with web thinning and a tapered web configuration, which reduces cutting force and improves performance in tough materials. It is equally effective in light metals and high-strength ferrous alloys, making it a versatile addition to a professional toolbox.

Key Features

• Cobalt tool material for heat resistance and extended tool life in hard and abrasive materials
• 135-degree split point enables self-centering and reduces thrust force without a pilot hole
• Taper length body provides additional reach compared to standard jobber-length bits
• Right-hand spiral flute with 6xD ratio supports efficient chip removal in deep holes
• Web-thinned tapered web configuration reduces cutting resistance
• Straight shank compatible with standard drill chucks; no threading on shank

Compatibility

Designed for drilling into a broad range of materials including alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, cermet, copper, graphite, hardened steel, high strength bronze, magnesium, magnesium alloy, malleable iron, nickel, nickel alloy, reinforced plastic materials, and stainless steel. Conforms to ANSI standards.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with cutting tool safety. Always secure the workpiece and ensure the drill chuck is fully tightened before operation. Reduce spindle speed and apply appropriate cutting fluid when drilling hardened steel or stainless steel to prevent premature wear. Inspect the cutting edges before each use and do not use a bit with chipped or worn flutes, as this can cause workpiece damage or bit breakage.