Cleveland C54761 Bottoming Hand Tap 9/16-12 Unc Hss

Product Description

The CLEVELAND C54761 is a 9/16-12 UNC bottoming hand tap designed for cutting internal threads in both blind holes and through-holes. Made from high speed steel with a bright uncoated finish, it features a 4-flute straight flute geometry and a right-hand thread direction. The bottoming chamfer allows threading to the bottom of blind holes with minimal runout. Overall length is 3.594 inches with a 1 inch thread length. Class of fit is 2B with an H3 thread limit, making it suitable for standard tolerance threading applications across a range of ferrous and non-ferrous materials.

This tap is used in machining, fabrication, and maintenance applications where a 9/16-12 UNC thread is required. It is suited for blind hole and through-hole threading in alloy steel, carbon steel, aluminum, and free-machining stainless steel. The bottoming chamfer style is the final step in a standard three-tap sequence — used after a taper or plug tap has started the thread — making it a standard tool in production shops, tool rooms, and field maintenance operations.

Key Features

• Bottoming chamfer cuts threads to the bottom of blind holes
• High speed steel construction provides hardness and wear resistance across common work materials
• Bright uncoated finish suitable for use with cutting fluids across a broad material range
• 4-flute straight flute design for balanced cutting action and chip clearance
• H3 thread limit and 2B class of fit for standard tolerance internal threads
• Right-hand thread direction, 9/16-12 UNC designation

Compatibility

Designed for threading alloy steel, carbon steel, aluminum, and free-machining stainless steel. Suitable for blind hole and through-hole threading applications requiring a 9/16-12 UNC internal thread to a 2B class of fit.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench or tapping fixture. Always ensure the workpiece is securely clamped and the tap is properly aligned with the pilot hole before applying torque. Apply a suitable cutting fluid for the work material to extend tool life and improve thread finish. When used in a three-tap sequence, use the bottoming tap only after a taper or plug tap has established the thread lead.