Kennametal 4131185 Spiral Point Tap 8-32 Unc Hss

Product Description

The KENNAMETAL 4131185 is a spiral point tap designed for cutting 8-32 UNC internal threads in a wide range of ferrous metals. Built from high speed steel (HSS) with an oxide finish, it provides adequate lubricity and corrosion resistance for general-purpose tapping operations. The plug chamfer distributes the cutting load across several leading threads, making it well suited for through-hole applications. With an overall length of 2.125 inches and a thread length of 0.75 inches, this tap fits standard tap holders and extension arms used in manual and machine tapping setups. The H2 thread limit holds tight tolerances for 3B class of fit applications.

This tap is intended for through-hole tapping in materials including cast iron, ductile iron, stainless steel, and steel. It is commonly used in production and maintenance environments where 8-32 UNC fastener threads are required. Machinists, tool and die technicians, and maintenance mechanics use this tap with drill presses, CNC machining centers, and hand tap handles. The 2-flute design helps manage chip flow in through-hole applications by pushing chips forward ahead of the tap.

Key Features

• 8-32 UNC thread form with H2 thread limit for 3B class of fit tolerance control
• High speed steel construction handles a broad range of ferrous workpiece materials
• Oxide finish provides baseline lubricity and mild corrosion resistance
• Plug chamfer distributes cutting load, optimized for through-hole tapping
• 2-flute spiral point design pushes chips ahead to clear through-holes efficiently
• Right-hand thread direction for standard forward tapping operations

Compatibility

Designed for cutting 8-32 UNC right-hand internal threads in cast iron, ductile iron, stainless steel, and steel workpieces. Fits standard machine tap holders sized for the 0.168-inch shank diameter.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a compatible tap holder, drill press, or CNC machine set to right-hand rotation. Always ensure the pilot hole is drilled to the correct tap drill size for 8-32 UNC before tapping. Secure the workpiece firmly and apply cutting fluid appropriate for the workpiece material, particularly when tapping stainless steel. Do not reverse the tap to break chips in through-hole applications; the spiral point is designed to push chips forward.