Cleveland C57191 Spiral Point Tap 7/16-14 Unc Hss

Product Description

The CLEVELAND C57191 is a spiral point plug tap designed for through-hole threading in metal workpieces. Built from high speed steel (HSS) with a bright finish, it cuts a 7/16-14 UNC thread profile using 3 flutes and a plug chamfer that eases entry into the cut. The H2 thread limit holds tight dimensional tolerance, making it well-suited for production threading where Class 2B fit is required. At 3.156 inches overall length with a 0.875-inch thread length, it fits standard tap holders and is driven with a right-hand rotation. Machinists, tool-and-die technicians, and maintenance mechanics install this tap by hand or under machine power.

This tap is intended for through-hole applications in alloy steel, carbon steel, and aluminum. The spiral point geometry pushes chips forward through the hole rather than packing them in the flutes, which makes it particularly effective in CNC tapping cycles and production drilling-and-tapping operations. It is appropriate for both job-shop and light industrial maintenance work where a standard UNC thread form is needed.

Key Features

• 7/16-14 UNC thread profile with Class 2B fit and H2 thread limit for consistent dimensional accuracy
• Spiral point geometry drives chips forward, ideal for through-hole threading
• 3-flute plug chamfer design eases thread engagement at hole entry
• High speed steel construction handles alloy steel, carbon steel, and aluminum
• Bright finish with no coating — suitable for use with standard cutting fluids
• Right-hand cut, no coolant-through — compatible with conventional tap holders and tapping arms

Compatibility

Designed as a standard replacement or production spiral point tap for through-hole 7/16-14 UNC threading operations in alloy steel, carbon steel, and aluminum workpieces. Compatible with tap holders sized for a 0.323-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping operations. Secure the workpiece firmly before starting the cut and align the tap perpendicular to the hole to avoid thread distortion. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Inspect the tap for wear or chipping before each use and retire it if flute geometry is compromised.