Cleveland C54665 Tap Set 7/16-20 Unf Hss 3-piece

Product Description

The CLEVELAND C54665 is a 3-piece tap set ground from high speed steel and finished bright for general-purpose threading work. The set covers all three tap styles in the 7/16-20 UNF thread form: bottoming, plug, and taper. Each tap is 4-flute, right-hand cut, with an overall length of 3.156 inches and a thread length of 0.880 inches. The H3 thread limit designation means these taps are ground to a tolerance that works with standard go/no-go gauging for UNF fits. Machinists, tool-and-die workers, and maintenance mechanics reach for this set when threading steel, cast iron, or similar ferrous materials in production or repair settings.

This tap set is suited for hand tapping or machine tapping operations where a complete sequence from starting the thread to bottoming out in blind holes is required. The taper tap starts the thread, the plug tap continues it, and the bottoming tap carries the thread to the base of a blind hole. The 7/16-20 UNF thread form appears commonly in automotive, aerospace, and general mechanical assemblies where fine-pitch threads are specified for greater tensile strength or adjustability compared to coarse-pitch equivalents.

Key Features

• 3-piece set includes bottoming, plug, and taper chamfer styles for complete blind or through-hole threading
• 7/16-20 UNF thread form, right-hand cut, for fine-pitch threading applications
• 4-flute geometry provides good chip clearance and cutting stability in ferrous materials
• High speed steel construction maintains edge hardness at elevated cutting temperatures
• Bright finish with no coating for easy visual inspection of cutting edge condition
• H3 thread limit for consistent dimensional compliance with standard UNF gauging

Compatibility

Designed for use with standard 7/16-20 UNF tap holders, T-handle wrenches, and machine tap chucks accepting the ground shank diameter appropriate to this size class. Suitable for hand or machine tapping operations in ferrous and similar machinable materials.

Installation Notes

Secure the workpiece before beginning any tapping operation and ensure the tap is started square to the drilled hole to prevent cross-threading or tap breakage. Use a cutting fluid appropriate to the workpiece material to extend tap life and improve thread finish. Back the tap out periodically to break and clear chips, particularly in blind-hole applications. Replace any tap in the set showing chipped flutes, worn chamfer lands, or evidence of galling before continuing production work.