Cleveland C55313 Spiral Point Tap 12-28 Unc Hss Tin

Product Description

The CLEVELAND C55313 is a spiral point plug tap designed for through-hole threading in metalworking applications. Built from high speed steel with a titanium nitride (TiN) coating, it produces clean, accurate internal threads in cast iron and steel. The plug chamfer style provides a gradual cutting action suited for starting threads in through holes. With 2 flutes and a right-hand thread direction, it follows the UNC thread standard at a 12-28 thread size. The H3 thread limit and Class 2B fit designation make it compatible with standard tolerance threading requirements across general machining and maintenance work.

This tap is used in machine shop, manufacturing, and maintenance-repair-operations (MRO) environments where through-hole threading of cast iron or steel workpieces is required. The spiral point geometry pushes chips forward through the hole, keeping the flutes clear during cutting. It is well suited for use in CNC machining centers, drill presses, and tapping arms where consistent thread quality across production runs is needed.

Key Features

• High speed steel construction for durability in cast iron and steel applications
• TiN coating reduces friction and extends tool life compared to uncoated HSS
• Plug chamfer for gradual thread engagement in through-hole applications
• Spiral point geometry pushes chips forward, reducing clogging in blind-adjacent through holes
• H3 thread limit with Class 2B fit for standard tolerance internal threads
• Right-hand, 2-flute design with no coolant-through requirement

Compatibility

Designed for through-hole threading of cast iron and steel workpieces requiring a 12-28 UNC internal thread with a Class 2B fit and H3 thread limit tolerance.

Installation Notes

This tap is installed and operated by machinists, tool and die makers, and maintenance technicians using standard tapping equipment. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for a 12-28 UNC thread before tapping. Apply an appropriate cutting fluid for the workpiece material to improve finish quality and tool life. Follow the equipment manufacturer guidelines and applicable shop safety procedures when operating tapping machinery.