Cleveland C54790 Tap Set 5/8-18 Unf 4 Flute Hss

Product Description

The CLEVELAND C54790 is a 3-piece tap set designed for cutting 5/8-18 UNF right-hand internal threads in metal workpieces. The set includes bottoming, plug, and taper chamfer taps, providing full thread-cutting coverage from starting a new hole to finishing threads to the bottom of a blind bore. Manufactured from high speed steel (HSS) with a bright finish, the C54790 delivers durability and consistent performance across ferrous and non-ferrous materials. Each tap features 4 flutes and carries an H3 thread limit for close tolerance threading. Overall length is 3.813 inches with a thread length of 1.09 inches.

This tap set is suited for machine shops, maintenance facilities, and production environments where 5/8-18 UNF threaded connections are required. The UNF (Unified National Fine) thread standard is common in automotive, hydraulic, and precision mechanical assemblies where fine-pitch threads provide superior holding strength and vibration resistance. The 3-piece configuration covers every stage of the threading operation, making it a practical choice for job shops handling varied workpiece depths. Installation is typically performed by machinists and tool-and-die or maintenance technicians on drill presses, CNC machining centers, or manual mills.

Key Features

• 3-piece set includes bottoming, plug, and taper chamfer taps for complete threading coverage
• High speed steel construction for durability in ferrous and non-ferrous workpieces
• 4-flute design promotes chip evacuation and thread quality
• H3 thread limit for close-tolerance 5/8-18 UNF threads
• Bright finish — no coating to alter tool dimensions
• Right-hand thread direction, compatible with standard CW rotation

Compatibility

Designed for cutting 5/8-18 UNF right-hand internal threads per the Unified National Fine thread standard. Suitable for use in machine tools and hand-tapping applications requiring Series 1004 HSS taps at the 5/8-18 size.

Installation Notes

Tapping operations should be performed by qualified machinists or maintenance technicians using appropriate tapping fluid or cutting oil for the workpiece material. Use the taper tap first to start the thread, follow with the plug tap, and finish with the bottoming tap when threading to the bottom of a blind hole. Ensure the tap is aligned perpendicular to the workpiece surface before applying torque to prevent tap breakage. Always secure the workpiece firmly before beginning the threading operation.