Cleveland C54884 Hand Tap 7/8-9 Unc Taper 4-flute Hss

Product Description

The CLEVELAND C54884 is a 7/8-9 UNC straight-flute hand tap designed for cutting internal threads in a range of ferrous and non-ferrous workpiece materials. Built from high speed steel (HSS) with a bright, uncoated finish, this 4-flute tap delivers reliable thread formation in both blind-hole and through-hole applications. The taper chamfer — 8 to 10 threads of lead — guides the tap into the hole progressively, reducing the force required to start the cut. With an overall length of 4.688 inches and a thread length of 2.22 inches, the C54884 is sized for typical hand-tapping setups in job shop, maintenance, and production environments. It is threaded to a Class 3B fit at an H4 thread limit, meeting tight-tolerance threading requirements.

This tap is suited for right-hand internal thread cutting in materials including alloy steel, carbon steel, aluminum, and free-machining stainless steel. The taper chamfer makes it appropriate as the starting tap in a hand-tap set sequence or as a standalone tap in through-hole work. The 0.697-inch shank diameter accommodates standard tap wrenches sized for 7/8 work. The 0.75-inch square drive end provides positive engagement with T-handle and straight-handle tap wrenches. Series 1001 identifies this as part of Cleveland's standard hand-tap line for UNC threads.

Key Features

• 7/8-9 UNC thread form, right-hand, Class 3B fit at H4 thread limit
• Taper chamfer for progressive thread engagement in blind and through-hole applications
• High speed steel construction for use in alloy steel, carbon steel, aluminum, and free-machining stainless steel
• Bright uncoated finish — inspect and re-coat to application requirements if needed
• 4 straight flutes for chip clearance in standard materials
• 0.75-inch square drive end for secure tap wrench engagement

Compatibility

Designed for use in blind-hole and through-hole threading operations requiring a 7/8-9 UNC right-hand internal thread. Compatible with alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard tap wrench sized for the 0.697-inch shank. Ensure the workpiece is properly drilled to the correct tap drill diameter for a 7/8-9 UNC thread before starting. Apply cutting fluid appropriate for the workpiece material to extend tap life and improve thread finish. Back the tap off periodically during cutting to break chips and prevent binding, particularly in blind holes.