Cleveland C54784 Hand Tap 5/8-11 Unc Bottoming Hss

Product Description

The CLEVELAND C54784 is a 5/8-11 UNC straight-flute hand tap designed for cutting internal threads in both blind holes and through holes. Built from high speed steel with a bright uncoated finish, it runs 4 flutes and a bottoming chamfer, making it the right choice when threads must extend close to the bottom of a blind hole. Overall length is 3.813 inches with a thread length of 1.09 inches. The H5 thread limit and Class 2B fit deliver the tolerance control that machinists and tool-and-die work require. Installed by machinists, maintenance techs, and metalworking professionals using standard tap handles or tapping fixtures.

This tap is suited for threading operations in alloy steel, carbon steel, aluminum, and free-machining stainless steel. The bottoming chamfer leaves only 1 to 2 threads of lead-in, so it is typically used as the final tap in a set after a taper or plug tap has started the thread. It performs in both manual hand-tapping and low-speed machine tapping setups where the operator controls feed. Series 1003 from Cleveland covers standard fractional UNC geometry in this configuration.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 4-flute straight-flute geometry for chip control in short-chipping materials
• High speed steel construction handles a broad range of ferrous and non-ferrous workpiece materials
• H5 thread limit and Class 2B fit for consistent tolerance in production and maintenance applications
• Bright uncoated finish — no coating buildup that could affect thread tolerance
• Right-hand thread direction; no coolant-through requirement for standard hand and machine tapping

Compatibility

Designed for cutting 5/8-11 UNC Class 2B internal threads in alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces. Suitable for blind-hole and through-hole threading applications.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the workpiece firmly before tapping. Use a properly sized tap handle or tapping fixture aligned perpendicular to the workpiece surface to prevent tap breakage. Apply cutting fluid appropriate for the workpiece material throughout the operation. For blind holes, follow a taper or plug tap with this bottoming tap to achieve full thread depth without forcing the tool against the hole bottom.