Cleveland C58441 Spiral Flute Tap 1/4-20 Unc Bottoming Hss

Product Description

The CLEVELAND C58441 is a spiral flute bottoming tap designed for cutting internal threads in blind holes. Built from high speed steel with an oxide finish, it produces a 1/4-20 UNC thread to a 2B class of fit with a right-hand thread and right-hand flute direction. The fast flute style and 52-degree helix angle help evacuate chips efficiently, reducing the risk of chip packing in confined depths. The bottoming chamfer allows threading to within a few threads of the bottom of a blind hole. With an overall length of 2.5 inches and a 0.63-inch thread length, this tap fits standard tap handles and machine setups used by machinists, toolroom technicians, and maintenance tradespeople.

This tap is suited for threading aluminum, non-ferrous metals, and steel in blind hole applications. It carries an H3 thread limit, making it appropriate for general-purpose tapping where moderate tolerance control is required. Typical use cases include production tapping, repair work, and fabrication in machine shops, maintenance facilities, and industrial trade environments. It is sold individually and is compatible with standard 1/4-inch tap driving systems.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 52-degree helix angle with fast flute style for efficient chip evacuation
• High speed steel construction for durability across aluminum, non-ferrous metals, and steel
• Oxide finish to reduce friction and improve chip flow
• H3 thread limit with 2B class of fit for general-purpose tolerance requirements
• Right-hand thread and right-hand flute direction for standard tap wrench and machine use

Compatibility

Designed as an OEM-style cutting tool for use in standard 1/4-20 UNC blind hole threading applications in aluminum, non-ferrous metals, and steel.

Installation Notes

Installation is performed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC machine spindle. Always use appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Secure the workpiece firmly before tapping to prevent movement. Follow OSHA and shop safety guidelines when operating tapping equipment, and inspect the tap for wear or chipping before each use.