Cleveland C60831 Straight Flute Tap 5/8-18 Unc Left Hand

Product Description

The CLEVELAND C60831 is a straight flute plug tap designed for left-hand through-hole threading in a 5/8-18 UNC thread form. Built from high-speed steel with a bright/uncoated finish, it delivers consistent cutting performance across a range of ferrous and non-ferrous materials. The plug chamfer provides a gradual lead-in, making it well suited for threading operations where the tap enters a pre-drilled through hole. With 4 flutes and an H3 thread limit, this tap holds tight tolerances to a 3B class of fit. Machinists and tool-and-die professionals specify this tap for production and maintenance threading where a left-hand thread is required.

The C60831 is designed for through-hole threading applications in cast iron, non-ferrous aluminum, stainless steel, and steel. It is appropriate for use in manual tapping setups and compatible tapping machines where left-hand thread cutting is called for. The plug chamfer style suits most standard through-hole production scenarios. This tap belongs to the Cleveland 1002L series and packages as a single unit.

Key Features

• Left-hand thread direction for applications requiring reverse-threaded fastener engagement
• 5/8-18 UNC thread form with 3B class of fit and H3 thread limit for precision tolerance control
• Plug chamfer for gradual lead-in in through-hole threading operations
• 4 straight flutes for chip clearance in a broad range of workpiece materials
• High-speed steel construction rated for cast iron, aluminum, stainless steel, and steel
• Bright/uncoated finish — no added coating to interfere with close-tolerance fits

Compatibility

Rated for through-hole threading in cast iron, non-ferrous aluminum, stainless steel, and steel. Designed as a standard OEM-style replacement or direct-use tap for any application requiring a 5/8-18 UNC left-hand thread to a 3B class of fit.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or compatible machine spindle. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 5/8-18 UNC thread before starting. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Because this tap cuts a left-hand thread, confirm thread direction requirements before beginning the operation.