Precision Twist Drill 5996312 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5996312 is a taper length cobalt drill bit designed for high-performance drilling in demanding industrial and trade applications. It features a 47/64 inch (0.7344 inches) diameter, a 135-degree notched split point for self-centering starts, and a spiral flute geometry with a 6xD flute-to-diameter ratio. The cobalt tool material provides heat and wear resistance beyond standard high-speed steel, making it suitable for hard and abrasive materials. The straight shank and web-thinned, tapered web configuration reduce thrust and improve chip evacuation. This bit is typically installed by machinists, maintenance technicians, and metalworking tradespeople using a drill press, mill, or hand drill with a keyed chuck.

This drill bit is built 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, cermet, graphite, and reinforced plastic materials. The taper length body gives more reach than a jobber bit while maintaining rigidity, making it a practical choice for through-hole drilling in structural components, fabrication work, and maintenance repair operations where standard-length bits fall short.

Key Features

• Cobalt tool material for superior heat resistance and extended tool life in hard metals
• 135-degree notched split point enables self-centering entry without a center punch on most materials
• Web-thinned tapered web reduces drilling thrust and improves chip flow
• Spiral flute with 6xD ratio promotes efficient chip evacuation in deep holes
• Straight shank at 47/64 inch diameter fits standard keyed and keyless chucks
• ANSI-standard geometry for consistent dimensional interchangeability
• Right-hand cutting direction; coated finish for added surface protection

Compatibility

Part of the PRECISION TWIST DRILL M51CO series. Compatible with any drill press, milling machine, or handheld drill accepting a 47/64 inch (0.7344 inch) straight shank. Suitable for heavy-duty drilling applications across the material types listed in the application paragraph above.

Installation Notes

Secure the shank fully in the chuck and verify chuck runout before drilling. De-energize and lock out any machine tool before changing or inspecting bits. Use appropriate cutting fluid or coolant when drilling stainless steel, hardened steel, or other work-hardening alloys to preserve edge life. Follow applicable ANSI B11 machine tool safety standards and shop-specific PPE requirements when operating drill presses or milling equipment.