Cleveland C54887 Tap Set 7/8-9 Unc 4 Flute Hss 3 Piece

Product Description

The CLEVELAND C54887 is a 3-piece tap set designed for cutting 7/8-9 UNC internal threads in metal workpieces. The set includes bottoming, plug, and taper chamfer taps, allowing machinists and tooling professionals to start, continue, and finish a threaded hole in sequence. Ground from high speed steel (HSS) with a bright finish, the C54887 delivers reliable thread cutting performance in steel, cast iron, and similar ferrous materials. The 4-flute geometry provides chip control and cutting stability. Overall length is 4.688 inches with a thread length of 2.220 inches, making it suited for standard-depth UNC tapping operations.

This tap set is used in general machining, maintenance and repair, and production environments where 7/8-9 UNC threads are required. The three-chamfer combination covers blind holes and through holes alike. The bottoming tap completes threads to the bottom of a blind hole, the plug tap handles most through-hole and mid-depth applications, and the taper tap starts threading in difficult-to-start conditions. This set is appropriate for manual tapping with a tap wrench or use with a tapping head on a drill press or mill. Thread limit is H4, which is a standard tolerance class for general-purpose UNC threading.

Key Features

• 3-piece set includes bottoming, plug, and taper chamfer taps for complete threading workflow
• 7/8-9 UNC thread form, right-hand thread direction
• High speed steel construction for cutting ferrous and general-purpose metals
• 4-flute design provides chip clearance and cutting stability
• Bright finish, no coating — suitable for use with cutting fluid
• H4 thread limit for standard UNC tolerance applications
• Overall length 4.688 inches, thread length 2.220 inches

Compatibility

Designed for cutting 7/8-9 UNC right-hand internal threads in accordance with Unified National Coarse thread standards. Suitable for use with standard tap wrenches, tapping heads, and machine tool holders accepting the appropriate shank size for this tap series.

Installation Notes

Tapping operations should be performed by a machinist or qualified tradesperson familiar with thread cutting procedures. Secure the workpiece firmly before beginning to prevent movement during tapping. Use an appropriate cutting fluid or tapping compound to extend tool life and improve thread quality. Follow the sequence — taper, then plug, then bottoming — when working blind holes to avoid tap breakage.