Cleveland C54599 Hand Tap 3/8-24 Bottoming Hss Unf

Product Description

The CLEVELAND C54599 is a 3/8-24 straight-flute hand tap designed for cutting internal threads in both blind and through-hole applications. Built from high speed steel (HSS) with a bright, uncoated finish, this tap carries a bottoming chamfer — typically 1 to 2 threads — allowing threads to be cut to the very bottom of a blind hole. It is configured for right-hand threading, sized to the UNF thread standard, and meets a 3B class of fit with an H3 thread limit. Overall length is 2.938 inches with a 0.75-inch thread length. Machinists, tool-and-die makers, and maintenance technicians use this tap for precision internal thread work across a range of metallic materials.

The C54599 is suited for production and maintenance threading operations on alloy steel, carbon steel, aluminum, and free-machining stainless steel. Its 3-flute straight-flute geometry is appropriate for both blind-hole and through-hole threading scenarios. The bottoming chamfer makes it the final step in a standard tap sequence — following a taper or plug tap — when full threads to the bottom of a hole are required. It fits standard tap wrenches and machine holders sized for a 0.381-inch shank diameter.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• High speed steel construction for durability across a range of metals
• Bright, uncoated finish — no coating buildup to affect thread tolerance
• 3-flute straight-flute design suitable for blind and through-hole threading
• H3 thread limit with 3B class of fit for precise thread tolerance control
• Right-hand, UNF 3/8-24 thread standard — Series 1003

Compatibility

Designed for use in standard tap wrenches and machine tap holders that accept a 0.381-inch shank diameter. Suitable for threading alloy steel, carbon steel, aluminum, and free-machining stainless steel workpieces to a 3/8-24 UNF internal thread specification.

Installation Notes

This tap is installed and driven by hand using a tap wrench or T-handle; it is not intended for direct power-drive use without appropriate torque control. Before tapping, confirm the correct drill size for a 3/8-24 UNF thread has been used to prepare the hole. Use cutting fluid appropriate for the workpiece material to extend tap life and improve thread finish. In a blind-hole sequence, follow a taper or plug tap with this bottoming tap to achieve full thread depth.