Cleveland C54445 Hand Tap 1/4-20 Bottoming Hss Unc

Product Description

The CLEVELAND C54445 is a 1/4-20 bottoming hand tap designed for threading operations in metalworking and machining applications. Built from high speed steel with a bright uncoated finish, this 4-flute straight flute tap cuts clean internal threads in both blind holes and through-holes. It carries a Class of Fit 2B designation and Thread Limit H1, making it suitable for standard tolerance threading work. The overall length is 2.5 inches with a thread length of 0.63 inches. This tap is sized for 20 threads per inch on a 1/4-inch diameter and follows the UNC thread standard. Machinists, tool-and-die makers, and maintenance technicians install this type of tap by hand or with a tap handle.

The C54445 is intended for threading work in alloy steel, aluminum, carbon steel, and free-machining stainless steel. The bottoming chamfer style leaves threads close to the bottom of a blind hole, making it a frequent choice when full thread depth is required before the hole terminates. It is part of Cleveland Series 1003, which covers standard hand taps for general-purpose threading in production and maintenance environments. Through-hole threading applications are also supported.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• High speed steel construction provides durability across a range of metals
• 4-flute straight flute geometry suits through-hole and blind hole threading
• Bright uncoated finish suitable for use with cutting fluid or tapping compounds
• Right-hand thread direction, UNC standard, Class of Fit 2B
• Thread Limit H1 for controlled tolerance threading

Compatibility

Designed as a standard UNC hand tap for use in conventional tap handles and tapping fixtures that accept straight-shank taps with a 0.255-inch shank diameter and a 5/16-inch square drive.

Installation Notes

This tap is installed by hand using a tap wrench or T-handle tap holder. Before tapping, ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for a 1/4-20 UNC thread. Apply an appropriate cutting fluid or tapping compound for the material being threaded. A bottoming tap is typically used as the final step in a tap sequence, after a taper or plug tap has started the thread.