Precision Twist Drill 5995691 Taper Length Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 5995691 is a taper length cobalt drill bit in the M52CO series, designed for high-performance drilling across a broad range of metals and engineered materials. It carries a wire gauge size of 3, which corresponds to a decimal diameter of 0.2130 inches, and features a 135-degree split point for accurate self-centering entry without a center punch. The flute length measures 3-5/8 inches with an overall length of 6 inches. The cobalt construction with a gold oxide finish provides elevated heat resistance and edge retention compared to standard high-speed steel, making it suited for tough alloys, hardened steel, and stainless steel applications.

This bit is intended for trade and production drilling environments where material hardness or work-hardening tendencies demand a more durable cutting tool than standard HSS. It is appropriate for use in drill presses, milling machines, and handheld power drilling applications. The taper length body gives additional reach for deeper hole applications while the straight cylindrical shank seats securely in standard drill chucks and collets. Typical users include machinists, maintenance technicians, pipefitters, and industrial fabricators working with alloy steel, stainless steel, cast iron, brass, copper, bronze, aluminum, and reinforced plastics.

Key Features

• Cobalt tool material with gold oxide finish for heat resistance and extended tool life in hard and abrasive materials
• 135-degree split point geometry enables self-centering entry and reduces thrust force at drill start
• Web-thinned, tapered web configuration reduces cutting resistance and improves chip evacuation
• Regular spiral flute with a 6xD flute-to-diameter ratio provides consistent chip flow on deeper cuts
• Straight cylindrical shank at 0.2130 inches diameter fits standard drill chucks without adapters
• Right-hand cut; ANSI standards compliance; heavy-duty grade rating
• No coolant-through requirement; compatible with dry or flood coolant drilling setups

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit for applications involving 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, and stainless steel, as specified by the manufacturer.

Installation Notes

Install in a properly rated drill press, lathe tailstock, or handheld drill with a chuck capacity that accepts a 0.2130-inch straight shank. Ensure the workpiece is securely fixtured before beginning the cut. When drilling hardened steel or stainless steel, use appropriate cutting fluid or flood coolant to manage heat and extend tool life. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed to maintain hole quality and prevent workpiece damage.