Kennametal 5689811 Spiral Point Tap 4-40 Unc Hss-e Tin

Product Description

The KENNAMETAL 5689811 is a spiral point tap designed for through-hole threading in non-ferrous metal applications. It cuts a 4-40 UNC thread profile with a plug chamfer, H2 thread limit, and a Class 3B fit tolerance. The tap is manufactured from vanadium high speed steel (HSS-E, material grade KSMN34) and carries a triple-layer TiN/CrC/C coating to extend tool life and resist wear. With 2 flutes and a right-hand thread direction, it drives chips forward through the hole during cutting. Overall length is 2.2 inches and thread length is 0.31 inches. Licensed machinists, tool and die makers, and maintenance technicians install this tap in production and repair environments.

This tap is suited for through-hole threading operations in non-ferrous metal workpieces where a 4-40 UNC thread is required. The spiral point geometry pushes chips ahead of the cutting edge rather than backing them out, making it effective in through-holes where chip evacuation space exists. It belongs to the Kennametal T672 series, which covers fractional inch taps for precision threading. Typical applications include machine assembly, panel fabrication, and component repair where small-diameter unified coarse threads must be cut consistently and to close tolerance.

Key Features

• 4-40 UNC thread profile with plug chamfer for gradual thread lead-in
• HSS-E (vanadium high speed steel) construction for improved wear resistance over standard HSS
• TiN/CrC/C triple-layer coating reduces friction and extends tool life in non-ferrous materials
• Spiral point geometry drives chips forward — optimized for through-hole applications
• H2 thread limit and Class 3B fit for close-tolerance threaded assemblies
• Right-hand cutting direction, no coolant-through requirement

Compatibility

Designed for through-hole threading in non-ferrous metal workpieces requiring a 4-40 UNC thread. Compatible with standard tap handles and machine tap holders sized for a 0.141-inch shank diameter.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap wrench, T-handle, or machine spindle holder. Always ensure the workpiece is securely fixtured and the pilot hole diameter is correctly sized for a 4-40 UNC thread before tapping. Apply an appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Do not force or back-drive the tap; back it off periodically to break chips if resistance increases.