Cleveland C57031 Spiral Point Tap 2-56 Unc Hss

Product Description

The CLEVELAND C57031 is a spiral point plug tap designed for through-hole threading in metalworking applications. Manufactured from high-speed steel with a bright, uncoated finish, it cuts a 2-56 UNC thread profile with 56 threads per inch. The spiral point geometry pushes chips ahead of the tap into the hole, making it well suited for through-hole work where chip evacuation is critical. It carries an H2 thread limit and a 2B class of fit, delivering consistent tolerance control in production and maintenance environments. This tap is installed by machinists, tool-and-die makers, and maintenance technicians working on precision assemblies.

This tap is intended for through-hole threading in alloy steel, carbon steel, and aluminum. With an overall length of 1.75 inches and a 7/16-inch thread length, it fits standard tap wrenches and machine spindles used in bench work, drill press setups, and CNC tapping operations. The 2-56 UNC size is common in small fastener applications found in instrument panels, electronic enclosures, and precision mechanical assemblies. Right-hand thread direction is standard for the vast majority of fastener installations in these applications.

Key Features

• Spiral point geometry pushes chips forward — optimized for through-hole threading
• High-speed steel construction provides wear resistance across alloy steel, carbon steel, and aluminum
• H2 thread limit and 2B class of fit for consistent, close-tolerance results
• Bright uncoated finish — suitable for use with standard cutting fluids
• 2 flutes with plug chamfer for controlled entry and smooth thread forming
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for through-hole threading of 2-56 UNC threads in alloy steel, aluminum, and carbon steel workpieces. Compatible with standard tap wrenches and machine tap holders sized for the 0.141-inch shank diameter.

Installation Notes

Always use an appropriate cutting fluid or tapping oil when threading steel to extend tool life and improve thread quality. Secure the workpiece firmly before tapping and ensure the tap enters the hole perpendicular to the work surface to avoid tap breakage at this small diameter. Clear chips frequently when hand tapping by reversing the tap a half-turn for every full turn of advancement. Broken tap removal from small-diameter holes is difficult — exercise care not to exceed the tap's torque limits.