Kennametal 4131316 Hand Tap 3/8-16 Unc Plug 3-flute Hss

Product Description

The KENNAMETAL 4131316 is a straight-flute hand tap designed for cutting internal threads in through-holes and blind holes. It features a plug chamfer, which distributes the cutting load across several leading threads for controlled thread engagement. Manufactured from high-speed steel with a bright uncoated finish, this tap is suited for manual tapping operations where precise thread form and dimensional accuracy are required. It cuts a 3/8-16 UNC thread to a Class 3B fit with an H3 thread limit, producing threads within tight tolerance for standard fastener applications. Overall length is 2.94 inches with a 1.25-inch thread length.

This tap is intended for use in cast iron and non-ferrous metals, making it appropriate for maintenance, repair, and fabrication work in machine shops, manufacturing facilities, and field service environments. The 3/8-16 UNC thread is one of the most common coarse-pitch sizes used in structural and mechanical assemblies across industrial and commercial applications. It is sold individually and belongs to the Kennametal Series 5305 and 5303 tap families.

Key Features

• Plug chamfer distributes cutting load over several threads for smooth thread entry
• High-speed steel construction provides wear resistance for hand tapping operations
• Bright uncoated finish suitable for use with a range of cutting fluids
• 3-flute straight-flute design optimized for through-hole and short blind-hole applications
• Class 3B fit with H3 thread limit for tight-tolerance thread production
• Right-hand thread direction, compatible with standard tapping handles and wrenches

Compatibility

Designed for cutting 3/8-16 UNC Class 3B internal threads in cast iron and non-ferrous metal workpieces. Part of Kennametal Series 5305 and 5303.

Installation Notes

Hand taps of this type are installed and operated by a machinist or maintenance technician using a standard tap wrench or T-handle. Before tapping, ensure the workpiece is secured and the pilot hole is drilled to the correct tap drill diameter for a 3/8-16 thread. Apply an appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Back the tap off periodically to break chips and prevent binding, particularly in deeper holes.