Kennametal 1542455 Hand Tap 5/16-18 Unc Bottoming Hss

Product Description

The KENNAMETAL 1542455 is a straight-flute hand tap designed for cutting right-hand internal threads in a bottoming configuration. Built from high-speed steel with a bright uncoated finish, it is engineered for 5/16-18 UNC threading at a Class 3B fit with an H3 thread limit. The tap measures 2.72 inches overall length with a 1.125-inch thread length and a 0.318-inch shank diameter. With 4 flutes, it produces clean threads in both cast iron and non-ferrous metal applications. Machinists, tool-and-die makers, and maintenance technicians use this tap for hand-threading operations requiring a full-depth thread close to the bottom of a blind hole.

This tap is suited for use in blind holes where thread engagement must extend as close to the hole bottom as possible. The bottoming chamfer — typically 1 to 2 threads of lead — allows thread cutting to the lowest practical depth after a spiral-point or plug tap has started the thread. It is appropriate for light industrial, maintenance, repair, and original equipment manufacturing environments working with cast iron and non-ferrous metals. It is part of the Series 5305 and 5303 product lines.

Key Features

• Bottoming chamfer for threading close to the base of blind holes
• High-speed steel construction for durability across cast iron and non-ferrous metal workpieces
• Bright uncoated finish suitable for use with cutting fluids
• 4-flute straight-flute design for clean thread formation in through and blind holes
• H3 thread limit and Class 3B fit for standard tolerance threading
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed as an OEM-style replacement or direct-use hand tap for 5/16-18 UNC threading applications in Series 5305 and 5303 tooling programs. Compatible material applications include cast iron and non-ferrous metals.

Installation Notes

This tap is intended for manual hand-tapping operations performed by machinists or maintenance technicians. Secure the workpiece before threading and use an appropriate tapping fluid for the material being threaded. A tap wrench sized for the shank diameter provides the necessary control to avoid tap breakage. When following a plug or spiral-point tap in a blind hole, clear chips between passes to prevent binding.