Precision Twist Drill 5996331 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5996331 is a taper length cobalt drill bit designed for demanding metal drilling applications. Built from cobalt tool steel, it delivers the heat resistance and hardness needed to cut through alloy steels, stainless steel, hardened steel, and other tough materials that standard high-speed steel bits cannot handle reliably. The 135-degree split notched point is self-centering and reduces the thrust required to start a hole, eliminating the need for a center punch on most surfaces. At 8.75 inches overall length with a 4.875-inch flute, it reaches deeper than a jobber-length bit while maintaining rigidity. Licensed machinists, millwrights, pipefitters, and HVAC fabricators are the typical end users.

The 5996331 is suited for drilling taper-length holes in structural and fabricated metal components across both residential and commercial applications. Its straight shank fits standard drill chucks and magnetic drill press setups without adapters. The Series M51CO designation identifies it as a heavy-duty cobalt spiral-flute bit built to ANSI standards. It performs in manual drill press, CNC, and hand-drill applications where extended reach is required. Rated material applications include alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, nickel alloys, reinforced plastics, and stainless steel.

Key Features

• Cobalt tool steel construction for high heat resistance and extended life in hard metals
• 135-degree notched split point is self-centering and reduces walking on hard surfaces
• Taper length body at 8.75 inches overall provides extended reach over standard jobber bits
• Web-thinned tapered web reduces cutting resistance and chip packing
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Built to ANSI standards as a heavy-duty Series M51CO bit

Compatibility

Designed as an OEM-style replacement and direct-fit taper length drill bit for use in any standard drill chuck or magnetic drill press accepting a 0.6250-inch straight shank.

Installation Notes

Install and remove this bit only with the drill press or driver fully powered off and the chuck secured. Ensure the straight shank is fully seated and the chuck key is removed before operation. Cobalt bits perform best at moderate speeds with consistent feed pressure and cutting fluid on ferrous metals. Follow applicable ANSI and shop-safety standards for drilling operations, including proper workpiece clamping to prevent rotation.