Cleveland C58450 Spiral Flute Tap 3/8-24 Unc 3 Flute Plug

Product Description

The CLEVELAND C58450 is a spiral flute plug tap designed for blind hole threading in 3/8-24 UNC thread form. Built from high speed steel with an oxide finish, it produces right hand threads in a single pass and is well suited for production or maintenance threading operations. The 52-degree helix angle and fast flute style drive chips up and out of the hole, which is essential when threading blind holes where chip evacuation cannot rely on gravity. This tap carries a 2B class of fit and H3 thread limit, making it appropriate for standard tolerance threaded assemblies. Machinists, toolmakers, and maintenance mechanics are the primary users.

The C58450 is rated for use in aluminum, non-ferrous metals, and steel. Its plug chamfer provides a gradual lead-in, distributing cutting load across several threads at the start of the cut. With an overall length of 2-15/16 inches and a thread length of 0.75 inches, it fits standard tap holders and machine spindles. The 0.381-inch shank diameter and 0.4375-inch square length accommodate hand tapping with a tap wrench or machine tapping in a drill press, CNC machining center, or tapping head.

Key Features

• 52-degree helix angle with fast flute style for efficient upward chip evacuation in blind holes
• High speed steel construction for durability across aluminum, non-ferrous, and steel workpieces
• Oxide finish provides light corrosion resistance and reduces galling during operation
• Plug chamfer distributes lead-in cutting load across multiple thread starts
• H3 thread limit and 2B class of fit for standard tolerance threaded assemblies
• 3-flute design balances chip capacity and tool rigidity in the 3/8-24 UNC size range

Compatibility

Designed for blind hole threading in 3/8-24 UNC applications in aluminum, non-ferrous metals, and steel. Fits standard tap holders accepting a 0.381-inch shank diameter in the 1093BO series.

Installation Notes

Machinists and maintenance mechanics should ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 3/8-24 UNC before starting. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. When machine tapping, set spindle speed and feed rate per the tap manufacturer recommendations for the material being threaded. Never force a tap that has stopped rotating freely, as spiral flute taps in blind holes can bind if chip evacuation is interrupted.