Cleveland C54511 Tap Set 5/16-18 Unc Hss 3 Piece

Product Description

The CLEVELAND C54511 is a 3-piece high speed steel tap set designed for cutting 5/16-18 UNC internal threads. The set includes bottoming, plug, and taper chamfer taps, covering all three stages of thread starting and finishing in a single kit. Manufactured from high speed steel with a bright finish, these taps are suited for general-purpose threading in a wide range of metals and materials. Each tap features 4 flutes for efficient chip evacuation and an H3 thread limit for controlled tolerance. The overall length is 2.719 inches with a thread length of 0.690 inches. Right-hand thread direction is standard. Machinists, maintenance technicians, and tool-and-die professionals reach for this set when threading from scratch or chasing damaged threads.

This tap set is used in machine shops, maintenance and repair operations, and light manufacturing environments where 5/16-18 UNC threaded holes are common. The three-chamfer configuration makes it practical for through-holes and blind holes alike. The taper tap starts the thread easily, the plug tap advances it, and the bottoming tap completes threading to the base of a blind hole. High speed steel construction handles steel, cast iron, aluminum, and most plastics without requiring carbide tooling.

Key Features

• Three-piece set includes bottoming, plug, and taper chamfer taps for full threading workflow
• High speed steel construction provides durability across common workpiece materials
• 4-flute geometry promotes chip evacuation and thread accuracy
• H3 thread limit ensures controlled tolerance for standard UNC fits
• Bright finish with 2.719-inch overall length and 0.690-inch thread length
• Right-hand thread direction, 5/16-18 UNC thread standard, Series 1004

Compatibility

Designed for cutting 5/16-18 UNC right-hand internal threads. Compatible with standard tap handles and machine tap holders sized for 5/16-inch tap shanks.

Installation Notes

Secure the workpiece firmly before tapping to prevent movement during threading. Use the appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Begin with the taper tap to start the thread, progress to the plug tap, and finish with the bottoming tap when threading to the bottom of a blind hole. Inspect tap condition regularly and replace any tap that shows chipping or excessive wear to avoid thread damage or tap breakage.