Kennametal 4130685 Hand Tap 1-8 Unc Plug Rh Tin Hss

Product Description

The KENNAMETAL 4130685 is a 1-8 UNC straight flute hand tap designed for cutting right-hand internal threads in a range of ferrous materials. Built from high-speed steel with a titanium nitride (TiN) coating, this tap delivers extended tool life and reduced friction during threading operations. The plug chamfer style makes it suitable for through-hole and most general-purpose tapping applications. With a 4-flute geometry and an H4 thread limit, it holds tight tolerances for Class 3B fits. Overall length is 5.125 inches with a thread length of 2.5 inches and a shank diameter of 0.800 inches.

This tap is suited for manual threading operations in machine shops, maintenance environments, and field repair situations where a hand tap driver or tap wrench is used. It is rated for use in cast iron, stainless steel, and steel. The plug chamfer, typically 3 to 5 threads of taper, allows the tap to start easily and thread through most of the hole depth, making it the most common tap style for general production and repair work. A licensed machinist or skilled tradesperson would typically handle this tool in commercial or industrial settings.

Key Features

• TiN coating reduces friction and extends tool life in ferrous materials
• High-speed steel construction withstands heat generated during threading
• Plug chamfer for versatile use in through-holes and general-purpose tapping
• 4-flute straight flute design provides clean thread formation and chip clearance
• H4 thread limit holds Class 3B fit tolerances for precision threading applications
• Right-hand thread direction for standard UNC fastener compatibility

Compatibility

Designed for cutting 1-8 UNC Class 3B internal threads in cast iron, stainless steel, and steel workpieces. Intended for use with standard hand tap wrenches and tap drivers that accept the 0.800-inch shank diameter.

Installation Notes

Hand taps should be installed and operated by qualified machinists or tradespeople familiar with thread-cutting procedures. Secure the workpiece firmly before tapping and use appropriate cutting fluid for the material being threaded to prevent tap breakage and improve finish quality. Back the tap off periodically to break chips and prevent binding, especially in blind holes. Do not force the tap if resistance increases unexpectedly, as high-speed steel is brittle under torsional overload.