Cleveland C54503 Hand Tap 5/16-18 Unc Bottoming Hss

Product Description

The CLEVELAND C54503 is a 5/16-18 UNC bottoming hand tap made from high speed steel with a bright uncoated finish. It features a 4-flute straight flute design and a right-hand thread direction. With an overall length of 2.719 inches and a thread length of 0.69 inches, this tap is built for producing clean, fully threaded holes close to the bottom of a blind bore. The H2 thread limit holds tight tolerances for a Class 2B fit. Licensed machinists, toolroom techs, and maintenance professionals use this tap for precision threading in ferrous and non-ferrous materials.

The C54503 is suited for both blind hole threading and through-hole threading applications. Its bottoming chamfer allows threads to be cut as close to the bottom of a blind hole as possible, making it a go-to choice when full thread depth is required near a stopped bore. The bright finish leaves the steel uncoated, which works well in lower-speed hand tapping operations and in materials that do not require a specialized coating for tool life. This tap fits standard hand tap wrenches and T-handle drivers used in machine shops, maintenance facilities, and production environments.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 4-flute straight flute geometry for chip control in a range of materials
• H2 thread limit for Class 2B fit tolerance
• Right-hand thread direction, 5/16-18 UNC
• Bright uncoated high speed steel construction
• Compatible with standard hand tap wrenches and T-handle drivers

Compatibility

Designed for threading alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces. Fits standard tap wrench drives sized for a 0.238 inch square drive. Part of the Cleveland Series 1003 tap line.

Installation Notes

Hand tapping should be performed by qualified machinists or maintenance technicians following safe machine shop practices. Secure the workpiece before tapping and use a proper tap wrench to maintain alignment. Apply cutting fluid appropriate for the workpiece material to reduce friction and extend tool life. Reverse the tap periodically during cutting to break chips and prevent binding.