Cleveland C55370 Spiral Point Tap 0-80 Unf Ticn Hss

Product Description

The CLEVELAND C55370 is a spiral point tap designed for through-hole threading in metalworking applications. Built from high speed steel with a TiCN (titanium carbonitride) finish, this tap delivers extended tool life and reduced friction in demanding cutting conditions. It features a plug chamfer, 2 flutes, a right-hand thread direction, and conforms to UNF thread standards at 0-80 thread size with an H2 thread limit and Class 2B fit. The overall length is 1.625 inches with a thread length of 0.310 inches. Licensed machinists and maintenance professionals working with precision fastening applications will find this tap suited to close-tolerance work.

This tap is intended for through-hole threading operations in materials including cast iron, stainless steel, and steel. The spiral point geometry pushes chips ahead of the cutting edge and out of the hole, making it well suited for production threading in through-hole conditions rather than blind-hole work. It is used in machine shop environments, maintenance and repair operations, and precision manufacturing settings where consistent thread quality in small-diameter fastener holes is required.

Key Features

• 0-80 UNF thread size with 80 threads per inch for fine-pitch precision threading
• High speed steel construction for durability across cast iron, stainless steel, and steel
• TiCN coating reduces friction and extends cutting life compared to uncoated HSS
• Plug chamfer provides a balance between starting ease and thread engagement length
• Spiral point design pushes chips forward, optimized for through-hole applications
• H2 thread limit and Class 2B fit ensure compatibility with standard tolerance fastener assemblies

Compatibility

Designed for through-hole threading of 0-80 UNF threads in cast iron, stainless steel, and steel workpieces. Compatible with standard tap holders and machine spindles accepting the 0.141-inch shank diameter.

Installation Notes

This tap should be installed in a rigid tap holder or tapping head appropriate for small-diameter taps to minimize deflection and thread damage. Power down all machinery and secure the workpiece before beginning setup. Use a cutting fluid or tapping oil appropriate for the workpiece material to improve finish and extend tool life. Inspect the tap for chipping or wear before each use, as small-diameter taps are susceptible to breakage under side load or misalignment.