Precision Twist Drill 5996383 9/16 in Cobalt Taper Drill Bit

Product Description

The PRECISION TWIST DRILL 5996383 is a taper length cobalt drill bit designed for demanding metal drilling applications in industrial and trade environments. Built from cobalt tool material for increased heat resistance and hardness, this bit features a 135-degree notched point that self-centers on contact and reduces walking on hard surfaces. The spiral flute geometry is web-thinned with a tapered web configuration, reducing cutting resistance and improving chip evacuation. At 9/16 inch (0.5625 inches) in diameter with an overall length of 8.25 inches and a flute length of 4.875 inches, this bit is suited for deep-reach drilling where standard length bits fall short. Machinists, pipefitters, and metal fabricators working in production or maintenance environments will find this tool appropriate for heavy-duty hole-making tasks.

This taper length drill bit is engineered for use across a broad range of materials including alloy steel, carbon steel, stainless steel, cast iron, malleable iron, hardened steel, aluminum, aluminum alloy, brass, bronze, high strength bronze, copper, nickel, nickel alloy, magnesium, magnesium alloy, cermet, graphite, and reinforced plastic materials. The right-hand cut spiral flute design and self-centering point make it well suited for accurate hole location in both manual and machine drilling setups. Typical applications include structural fabrication, maintenance repair, and precision machine work where a longer reach is required.

Key Features

• Cobalt tool material provides elevated heat resistance for drilling hard and abrasive metals
• 135-degree notched point for self-centering and reduced thrust force on entry
• Web-thinned tapered web configuration improves chip clearance and reduces feed pressure
• Taper length body at 8.25 inches overall with 4.875 inch flute length for extended reach
• Straight shank at 0.5625 inches diameter fits standard drill chucks without adapters
• Right-hand spiral flute with coated finish for improved surface durability
• Meets ANSI standards for dimensional accuracy and tool geometry

Compatibility

Part of the M51CO series, this bit is compatible with standard drill chucks and drilling equipment accepting a 9/16 inch straight shank. Suitable for use in drill presses, magnetic drills, and hand-held drilling machines operating within the appropriate speed and feed range for the listed material applications.

Installation Notes

This drill bit is installed and operated by machinists, pipefitters, millwrights, or other qualified tradespeople using drill presses or powered drilling equipment. Ensure the workpiece is securely clamped and the shank is fully seated in the chuck before operation. Use appropriate cutting fluid or coolant for the material being drilled to extend bit life and maintain hole quality. Inspect the cutting edges before each use and remove from service if chipping or excessive wear is observed.