Cleveland C54848 Bottoming Hand Tap 3/4-16 Unf 4-flute Hss

Product Description

The CLEVELAND C54848 is a 3/4-16 UNF bottoming hand tap ground from high speed steel and finished bright (uncoated) for general-purpose threading applications. With a 4-flute straight-flute design and a bottoming chamfer, it cuts threads close to the bottom of a blind hole or runs full-depth in through-hole work. Overall length is 4.25 inches, thread length is 1.22 inches, and the tap carries a Class 3B fit with an H3 thread limit for precise, close-tolerance thread production. It is installed using a standard tap wrench and is suited for manual hand-tapping operations in machine shops, maintenance environments, and tool rooms.

This tap is designed for threading into blind holes and through-holes in a range of workpiece materials. The bottoming chamfer style leaves just 1 to 2 threads of lead-in, making it the correct choice when threads must extend as close to the bottom of a hole as possible. It is commonly used in production and maintenance machining where 3/4-16 UNF fastener threads are required. Material application includes alloy steel, aluminum, carbon steel, and free-machining stainless steel, making it a versatile choice across common shop materials.

Key Features

• Bottoming chamfer for threading to within 1-2 threads of blind-hole bottom
• 4-flute straight-flute geometry for chip control in a variety of materials
• High speed steel construction for durability in manual and light-machine tapping
• Bright (uncoated) finish suitable for use with cutting oils and tapping fluids
• Class 3B fit, H3 thread limit for close-tolerance 3/4-16 UNF threads
• Right-hand thread direction, compatible with standard tap wrenches and holders

Compatibility

Designed for 3/4-16 UNF (Unified National Fine) threading applications in alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces. Series 1003.

Installation Notes

This tap is installed by machinists and maintenance technicians using a properly sized tap wrench or tapping fixture. Always ensure the pilot hole is drilled to the correct tap drill diameter for 3/4-16 UNF before starting the tap. Apply appropriate cutting oil or tapping fluid throughout the operation to extend tool life and improve thread quality. Back the tap out periodically to break chips when working in blind holes.