Kennametal 4131221 Spiral Point Tap 5/8-11 Unc Hss

Product Description

The KENNAMETAL 4131221 is a spiral point tap designed for right-hand threading in through-hole applications. Built from high speed steel with an oxide finish, it cuts a 5/8-11 UNC thread to a 3B class of fit with an H3 thread limit. The plug chamfer eases entry and distributes cutting load progressively, making this tap well-suited for production environments where consistent thread quality is required. Thread length measures 1.813 inches and overall length is 3.813 inches. Licensed machinists and tool-room technicians working in metalworking shops are the primary users of this tool.

This tap is rated for use in cast iron, ductile iron, stainless steel, and steel. The spiral point design pushes chips forward ahead of the tap, which is the preferred approach for through-hole threading where chip evacuation must be positive and reliable. It is a practical choice for job shops, maintenance departments, and production lines cutting standard UNC threads in ferrous materials. The 3-flute geometry balances cutting efficiency with thread finish across these material groups.

Key Features

• 5/8-11 UNC thread form, right-hand direction, 3B class of fit
• H3 thread limit for consistent fit tolerance across production runs
• Plug chamfer for progressive load distribution on thread entry
• High speed steel construction handles cast iron, ductile iron, stainless steel, and steel
• Oxide finish provides mild lubricity and corrosion resistance during storage and use
• Spiral point geometry pushes chips forward, optimized for through-hole tapping without coolant-through requirement

Compatibility

Designed for through-hole tapping operations in ferrous materials including cast iron, ductile iron, stainless steel, and steel where a 5/8-11 UNC 3B thread is specified.

Installation Notes

This tap is installed by a machinist or tool-room technician in a drill press, CNC machining center, or tapping head rated for the required torque range. Ensure the workpiece is securely fixtured and the tap is aligned axially with the drilled hole before engagement. Use an appropriate cutting fluid or tapping compound for the material being threaded, especially when working with stainless steel. Inspect the tap for chipping or wear before each use and replace if thread quality degrades.