Cleveland C55322 Spiral Point Tap 5/16-24 Unf Hss Tin

Product Description

The CLEVELAND C55322 is a spiral point plug tap designed for through-hole threading operations in metalworking applications. Built from high speed steel with a titanium nitride (TiN) coating, this tap generates threads with a 5/16-24 UNF thread form and holds a Class 3B fit tolerance at the H3 thread limit. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole work in production and maintenance environments. With an overall length of 2.719 inches and a thread length of 0.690 inches, it handles standard fastener thread depth requirements. Machinists, toolroom technicians, and maintenance mechanics are the primary users.

This tap is intended for through-hole threading in alloy steel, carbon steel, and aluminum. The plug chamfer — typically 3 to 5 threads of lead — provides a gradual entry that is standard for production tapping on through-hole features. The 2-flute design and spiral point geometry work together to clear chips efficiently during machine or hand tapping. It is a single-unit item suited for benchtop drill presses, CNC machining centers, or manual tapping setups where a right-hand thread is required.

Key Features

• Spiral point geometry pushes chips forward — optimized for through-hole threading
• TiN coating increases surface hardness and reduces friction for extended tool life
• High speed steel construction provides toughness across alloy steel, carbon steel, and aluminum
• Plug chamfer (3-5 lead threads) for standard production through-hole entry
• H3 thread limit holds Class 3B fit — suitable for standard tolerance threaded assemblies
• Right-hand cut, 2-flute design for efficient chip evacuation in machine tapping

Compatibility

Designed for through-hole threading in alloy steel, carbon steel, and aluminum workpieces requiring a 5/16-24 UNF Class 3B right-hand thread. Part of the CLEVELAND Series 1011TN product line.

Installation Notes

This tap should be installed in a tapping chuck or holder appropriate for the shank diameter of 0.318 inches. Ensure the workpiece is rigidly fixtured and the pilot hole is drilled to the correct tap drill size for a 5/16-24 UNF thread before starting. Apply cutting fluid appropriate for the workpiece material to extend tap life and reduce torque. When tapping by hand or on manual equipment, maintain axial alignment to avoid tap breakage.