Cleveland C55348 Spiral Point Tap 1/4-20 Unc Tin Hss

Product Description

The CLEVELAND C55348 is a spiral point plug tap designed for through-hole threading in ferrous materials. Built from high speed steel with a titanium nitride (TiN) coating, this tap cuts 1/4-20 UNC threads with a right-hand direction and a 2B class of fit. The plug chamfer provides a gradual entry, making it well-suited for initiating threads in through-holes without excessive torque. With an overall length of 2.5 inches and a thread length of 0.63 inches, it fits standard tap holders and hand-tap wrench setups. The H1 thread limit holds tight tolerances for consistent thread quality across production runs.

This tap is intended for through-hole threading applications in cast iron and steel workpieces. The 2-flute spiral point geometry pushes chips forward ahead of the cutting edge rather than packing them in the flutes, keeping the cutting zone clear during machining. It is appropriate for use in manual hand-tapping operations as well as CNC and drill press setups. The TiN finish extends tool life by reducing friction and improving surface hardness. This tap is used by machinists, maintenance technicians, and fabricators working in production or repair environments.

Key Features

• Spiral point geometry pushes chips forward, keeping the hole clear during through-hole threading
• TiN coating reduces friction and extends tool life compared to uncoated HSS
• Plug chamfer allows gradual thread engagement for controlled cutting action
• H1 thread limit maintains consistent 2B class of fit tolerance
• Right-hand cut, compatible with standard tap holders and wrenches
• No coolant-through requirement — suitable for conventional lubricated hand or machine tapping

Compatibility

Designed for through-hole threading of cast iron and steel workpieces in 1/4-20 UNC thread applications. Fits standard tap holders sized for a 0.255-inch shank diameter.

Installation Notes

This tap should be installed in a properly sized tap holder or chuck before use. Always apply a suitable cutting fluid when tapping steel or cast iron to reduce heat and extend tool life. Ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole before engagement. Follow applicable shop safety practices and inspect the tap for chipping or wear before each use.