Cleveland C57128 Spiral Point Tap 1/4-20 Unc Hss

Product Description

The CLEVELAND C57128 is a spiral point tap designed for through-hole threading in ferrous and non-ferrous metals. It cuts a 1/4-20 UNC thread profile with a plug chamfer, which progressively engages the workpiece for clean thread formation. Built from high speed steel with a bright finish, this tap handles alloy steel, carbon steel, and aluminum in production and maintenance machining environments. The H2 thread limit and 2B class of fit make it suited for standard tolerance threaded fastener applications. With 2 flutes and a right-hand thread direction, it pushes chips forward through the hole, keeping the flutes clear during cutting.

This tap is used in through-hole threading operations on CNC machining centers, drill presses, and tapping machines, as well as hand-tapping setups on the bench. It is appropriate for general-purpose work in metalworking shops, maintenance facilities, and manufacturing environments where 1/4-20 UNC threads are a common fastener standard. The plug chamfer style makes it a practical choice when starting threads from the face of a workpiece rather than a blind hole application.

Key Features

• Spiral point design pushes chips forward, ideal for through-hole threading
• 1/4-20 UNC thread profile with plug chamfer for progressive thread engagement
• High speed steel construction for durability across steel and aluminum workpieces
• H2 thread limit with 2B class of fit for standard tolerance fastener threads
• Right-hand thread direction, 2 flutes
• Bright finish with no coolant-through requirement

Compatibility

Designed for through-hole threading of alloy steel, aluminum, and carbon steel workpieces requiring a 1/4-20 UNC, 2B class of fit thread.

Installation Notes

This tap is installed and used by machinists and maintenance technicians working on manual or CNC tapping operations. Always secure the workpiece and ensure proper alignment before threading to avoid tap breakage. Use an appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Tapping torque limits should follow the machine or tap handle manufacturer guidelines for the tap size being used.