Precision Twist Drill 5996618 Taper Length Cobalt Drill Bit

Product Description

The PRECISION TWIST DRILL 5996618 is a taper length cobalt drill bit designed for demanding metal fabrication and machining applications. Built to the M51CO series standard, it features a 17/64 inch (0.2656 inch) diameter with a 135-degree split point that enables self-centering starts without a center punch. The cobalt tool material with gold oxide coating provides heat resistance and extended tool life when cutting hard or abrasive materials. With a 3-7/8 inch flute length and a 6-1/4 inch overall length, this bit handles deeper drilling passes than standard jobber-length drills. It is intended for use by machinists, metal fabricators, maintenance technicians, and tool-and-die professionals.

This drill bit is suited for production and maintenance drilling in alloy steel, carbon steel, stainless steel, cast iron, hardened steel, aluminum, brass, bronze, copper, nickel alloys, magnesium, and reinforced plastics. The taper length body gives it reach for through-hole drilling in thicker stock while the straight cylindrical shank fits standard drill chucks and collet holders. It is commonly used in machine shops, manufacturing facilities, and field maintenance environments where a single bit must handle a wide range of metal workpiece materials.

Key Features

• Cobalt tool material with gold oxide coating for heat resistance and extended wear life in hard metals
• 135-degree split point for self-centering entry, reducing walk on hard or smooth surfaces
• Taper length body at 6-1/4 inches overall provides extra reach over standard jobber-length bits
• 3-7/8 inch spiral flute length promotes chip evacuation during deep drilling passes
• Web-thinned, tapered web configuration reduces thrust requirements at the cutting tip
• Right-hand cut with regular spiral flute; straight cylindrical shank fits standard chucks
• Meets ANSI standards; heavy-duty grade rated for high-performance drilling

Compatibility

Designed as an OEM-style replacement or direct upgrade for 17/64 inch taper length drill bits in any standard drill press, CNC machining center, or handheld drill with a compatible chuck capacity. No coolant-through requirement; compatible with dry or flood-cooled setups.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with drill press or CNC spindle operation. Secure the straight shank firmly in the chuck or collet before beginning any drilling operation and verify runout before cutting into workpiece material. Always wear appropriate eye protection and follow applicable shop safety procedures when working with rotary cutting tools. Inspect the cutting edges and web for wear or chipping before each use and replace the bit when performance degrades to avoid workpiece damage or tool breakage.