Cleveland C57220 Spiral Point Tap 1/2-20 Unf Hss

Product Description

The CLEVELAND C57220 is a spiral point tap designed for cutting internal threads in through-hole applications. Built from high-speed steel with a bright, uncoated finish, this tap handles threading in alloy steel, aluminum, and carbon steel. It is configured with a plug chamfer and three flutes, producing a 1/2-20 UNF thread form to a 3B class of fit with an H3 thread limit. The spiral point geometry pushes chips forward through the hole, keeping the flutes clear during the cut. Overall length is 3.375 inches with a thread length of 0.94 inches. Machinists and tool-and-die professionals will recognize this as a standard production tap for general threading operations.

This tap is suited for through-hole threading in ferrous and non-ferrous materials including alloy steel, carbon steel, and aluminum. The 1/2-20 UNF specification makes it a common choice for precision fastener applications in aerospace, automotive, and general machining environments where fine-thread fastener engagement is required. The plug chamfer allows the tap to start easily in a pre-drilled hole and is appropriate for use in both manual tapping operations and CNC rigid-tapping setups.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• High-speed steel construction provides durability across a range of workpiece materials
• Bright, uncoated finish suitable for general-purpose threading without specialized coatings
• Plug chamfer for easy hole entry and progressive thread cutting
• H3 thread limit ensures consistent fit to 3B class tolerance
• Right-hand thread direction compatible with standard toolholders and tap wrenches

Compatibility

Designed for through-hole threading applications requiring a 1/2-20 UNF right-hand thread in alloy steel, aluminum, and carbon steel workpieces.

Installation Notes

This tap should be used by qualified machinists following appropriate speeds and feeds for the workpiece material. Ensure the tap drill size matches the 1/2-20 UNF specification before threading. Apply appropriate cutting fluid to extend tool life and improve thread quality, particularly in steel. For CNC rigid tapping, verify spindle synchronization before engaging the tap to avoid thread damage or tool breakage.