Cleveland C54663 Hand Tap 7/16-20 Bottoming Hss 4-flute

Product Description

The CLEVELAND C54663 is a 7/16-20 bottoming hand tap designed for cutting internal threads in blind holes and through-holes. Built from bright uncoated high speed steel with a 4-flute straight flute geometry, it produces clean UNF threads in a right-hand direction. The bottoming chamfer style allows threading close to the bottom of a blind hole. The overall length measures 3.156 inches with a thread length of 0.880 inches. Thread limit is H3, and the class of fit is 2B, making it suitable for standard tolerance threading applications in production and maintenance environments. Machinists, toolroom technicians, and maintenance mechanics are the primary users of this tap.

This tap is suited for threading operations in alloy steel, aluminum, carbon steel, and free-machining stainless steel. It is used in both blind hole and through-hole applications where a 7/16-20 UNF thread form is required. The bottoming chamfer makes it the correct choice when threading must extend to the full depth of a blind hole after a taper or plug tap has been used to start the thread. It fits standard tap handles sized for its 0.323 inch shank diameter and belongs to Cleveland Series 1003.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish suitable for general-purpose threading operations
• 4-flute straight flute design for stable thread cutting
• H3 thread limit with 2B class of fit for standard tolerance UNF threads
• No coolant-through requirement — compatible with standard hand and machine tapping setups

Compatibility

Designed for cutting 7/16-20 UNF internal threads in alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces in blind hole and through-hole configurations.

Installation Notes

This tap is intended for use by machinists and maintenance technicians familiar with hand and machine tapping procedures. Always secure the workpiece and ensure the tap is properly aligned before beginning the threading operation. Power down or disengage any machine spindle before changing or handling taps. When used as a bottoming tap, a taper or plug tap should be used first to establish the thread before the bottoming tap is run to full depth.