Precision Twist Drill 5995838 Cobalt Taper Drill Bit No 29

Product Description

The PRECISION TWIST DRILL 5995838 is a taper length cobalt drill bit designed for heavy-duty metal drilling applications. Built on the M52CO series platform, it features a 135-degree split point that self-centers on contact and reduces the need for a center punch. The straight cylindrical shank measures 0.136 inches in diameter, matching the No. 29 wire gauge size. At 5.375 inches overall length with a 3-inch flute length, this bit provides extended reach compared to a jobber-length drill while maintaining rigidity. The gold oxide finish indicates cobalt-enriched high-speed steel construction, delivering elevated heat resistance in demanding drilling operations. It is suited for machinists, maintenance technicians, and fabricators working in production or field environments.

This drill bit is intended for use in drilling alloy steel, carbon steel, stainless steel, cast iron, malleable iron, hardened steel, brass, bronze, high-strength bronze, copper, aluminum, aluminum alloy, magnesium, magnesium alloy, nickel, nickel alloy, reinforced plastic, cermet, graphite, and similar materials. The taper length configuration makes it a common choice when standard jobber bits lack the reach needed for deep-hole work in plate stock, structural components, or machined parts. It is sold individually as a single-piece unit.

Key Features

• No. 29 wire size, 0.136-inch decimal diameter for precise fractional and wire-gauge hole sizing
• 135-degree split point for self-centering entry and reduced thrust force
• Cobalt high-speed steel construction with gold oxide finish for heat and wear resistance
• Taper length body at 5.375 inches OAL with 3-inch flute length for extended reach drilling
• Regular spiral flute with web-thinned, tapered web configuration for efficient chip evacuation
• Right-hand cut, straight cylindrical shank compatible with standard drill chucks
• ANSI standard compliant, rated heavy-duty grade

Compatibility

Designed as a taper length replacement or supplement for No. 29 wire size drilling operations across a broad range of metals and engineered materials as listed under Material Application in the product specifications. Fits any standard drill chuck accepting a 0.136-inch straight shank.

Installation Notes

Installation and use is typically performed by machinists, tool-and-die professionals, or maintenance technicians operating drill presses, milling machines, or handheld power drills. Secure the straight shank fully in the chuck and verify concentricity before drilling to avoid bit deflection. Use appropriate cutting fluid for the workpiece material, particularly when drilling stainless steel or hardened steel, to extend tool life and maintain hole quality. Wear appropriate PPE including eye protection when operating any rotary cutting tool.