Cleveland C54892 Hand Tap 7/8-14 Unf Bottoming Hss

Product Description

The CLEVELAND C54892 is a straight-flute hand tap designed for cutting internal threads in metal workpieces. It is ground from high speed steel and carries a bright, uncoated finish that suits general-purpose tapping across a range of ferrous and non-ferrous materials. The tap cuts a 7/8-14 UNF right-hand thread to a Class 3B fit with an H4 thread limit, making it appropriate for applications that demand close thread tolerances. Overall length is 4.688 inches with a thread length of 2.22 inches. The bottoming chamfer allows threads to be carried to the bottom of blind holes where clearance is limited. Licensed machinists, toolmakers, and maintenance mechanics are the typical installers.

The C54892 is suited for blind-hole and through-hole threading operations in job-shop, production, and MRO environments. It performs in alloy steel, carbon steel, aluminum, and free-machining stainless steel. The 4-flute straight-flute geometry works best in materials that produce short, broken chips rather than long stringy ones. Applications include threading fastener holes in structural components, fixtures, tooling plates, and machine housings where a fine 14-TPI unified thread is specified.

Key Features

• Bottoming chamfer for threading to the base of blind holes
• 4-flute straight-flute design for chip control in short-chipping materials
• High speed steel construction for durability across production and MRO use
• Bright uncoated finish compatible with most cutting fluids and tapping compounds
• Class 3B, H4 thread limit for close-tolerance internal thread accuracy
• No coolant-through requirement simplifies setup on standard tapping equipment

Compatibility

Designed for blind-hole and through-hole threading in alloy steel, carbon steel, aluminum, and free-machining stainless steel where a 7/8-14 UNF Class 3B internal thread is required.

Installation Notes

Hand taps in this size range are driven with a tap wrench sized to the 0.750-inch square drive. Apply an appropriate cutting fluid or tapping compound for the workpiece material before starting the thread. Ensure the tap is started square to the hole axis to avoid cross-threading or tap breakage. Back the tap off periodically to break and clear chips, particularly in blind holes.