Kennametal 4131217 Spiral Point Tap 5/16-18 Unc Hss Oxide

Product Description

The KENNAMETAL 4131217 is a spiral point tap designed for cutting 5/16-18 UNC internal threads in a wide range of metalworking applications. Manufactured from high speed steel (HSS) with an oxide finish, this tap delivers reliable thread formation in cast iron, ductile iron, stainless steel, and carbon steel. It features a plug chamfer for standard through-hole tapping and a right-hand thread direction. The H3 thread limit and 3B class of fit ensure dimensional accuracy for precision threaded assemblies. With a 2-flute design, this tap is suited for work in materials that produce manageable chips, and the spiral point geometry pushes chips forward ahead of the cutting action to keep flutes clear during operation.

This tap is used in machining, maintenance, and repair operations requiring 5/16-18 UNC threads. The plug chamfer makes it appropriate for through-hole applications where the tap can pass fully through the workpiece. Typical install environments include machine shops, production floors, and field repair settings where machinists and millwrights require a dependable HSS tap for threading ferrous metals. Compatible material applications listed by the manufacturer include cast iron, ductile iron, stainless steel, and steel.

Key Features

• 5/16-18 UNC thread size with H3 thread limit and 3B class of fit for precise thread tolerance control
• High speed steel construction provides durability across ferrous metal applications
• Oxide finish improves lubrication retention and helps resist corrosion during use
• Spiral point geometry pushes chips forward, reducing clogging in through-hole tapping
• Plug chamfer with 2 flutes suited for standard through-hole threading operations
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for threading cast iron, ductile iron, stainless steel, and steel workpieces requiring 5/16-18 UNC internal threads in through-hole applications.

Installation Notes

This tap is installed and operated by machinists, tool and die makers, or maintenance technicians using a tap wrench, tapping head, or CNC machine spindle. Always secure the workpiece and ensure the tap is properly aligned with the drilled hole before applying cutting torque. Use a suitable cutting fluid or tapping compound appropriate for the workpiece material to extend tool life and improve thread quality. Inspect the tap for wear or damage before each use and replace if flutes show chipping or if thread form degrades.