Kennametal 4131372 Hand Tap 1/2-13 Unc Bottoming Hss

Product Description

The KENNAMETAL 4131372 is a 1/2-13 UNC bottoming hand tap designed for threading operations that require full thread depth close to the bottom of a blind hole. Manufactured from high-speed steel (HSS) with an oxide finish, this 4-flute straight-flute tap handles the rigors of production threading in ferrous materials. It carries a Class 3B fit and an H3 thread limit, making it appropriate for applications where close-tolerance internal threads are required. Overall length is 3.375 inches, with a thread length of 1.656 inches. Licensed machinists, tool and die makers, and maintenance technicians use this tap for hand-driven or low-speed machine tapping in a range of industrial applications.

This tap is suited for threading cast iron, ductile iron, and steel workpieces where a bottoming chamfer is needed to cut threads as close to the bottom of a hole as possible. The straight flute geometry makes it appropriate for through-holes and shallow blind holes in these materials. The 1/2-13 UNC thread form is a common fastener size across general manufacturing, structural fabrication, and maintenance repair operations, making this tap a frequently needed tool in any industrial shop environment.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• High-speed steel construction provides durability in ferrous materials
• Oxide finish improves lubricity and provides light corrosion resistance
• 4-flute straight flute design for stable cutting in cast iron, ductile iron, and steel
• Class 3B fit with H3 thread limit for close-tolerance internal threads
• Right-hand thread direction, standard UNC thread form

Compatibility

Designed for hand tapping or low-speed machine tapping of 1/2-13 UNC internal threads in cast iron, ductile iron, and steel. Suitable as an OEM-style replacement or direct addition to any tooling set requiring a standard 1/2-13 bottoming tap.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench or suitable tapping fixture. Always ensure the pilot hole is drilled to the correct tap drill diameter for a 1/2-13 UNC thread before beginning the tapping operation. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Never force the tap; back it off periodically to break chips and prevent tap breakage, especially in blind holes.