Kennametal 1540474 Hand Tap 5-40 Unc Plug Rh Hss

Product Description

The KENNAMETAL 1540474 is a straight-flute hand tap designed for cutting 5-40 UNC internal threads in a right-hand direction. Built from bright, uncoated high-speed steel, it is suited for manual tapping operations where controlled cutting speed and tool longevity are priorities. The tap carries a plug chamfer, making it the standard choice for through-holes and most general-purpose tapping sequences. It conforms to Class of Fit 2B and 3B thread standards and is manufactured to an H2 thread limit for consistent, on-tolerance thread production. Overall length is 1.94 inches with a thread length of 0.625 inches and a shank diameter of 0.141 inches.

This tap is intended for use in cast iron and non-ferrous metals, covering a broad range of fabrication, maintenance, and repair tasks. It fits naturally into toolroom work, field repair, and production setups where a reliable hand tap for small-diameter fastener threads is required. The 5-40 thread size is common in instrument panels, electrical enclosures, and light-duty mechanical assemblies. It belongs to KENNAMETAL Series 5305 and 5303, making it straightforward to cross-reference within that product family for matching sets or replacements.

Key Features

• Plug chamfer for general-purpose through-hole and blind-hole entry tapping
• H2 thread limit for consistent 2B and 3B class-of-fit thread production
• High-speed steel construction for durability across cast iron and non-ferrous workpieces
• Bright, uncoated finish suitable for use with standard tapping fluids
• 2-flute straight-flute geometry optimized for hand tapping operations
• Compact 1.94-inch overall length fits standard tap wrench chucks

Compatibility

Designed as an OEM-style replacement or toolroom-standard hand tap for 5-40 UNC thread applications in cast iron and non-ferrous metal workpieces. Part of KENNAMETAL Series 5305 and 5303.

Installation Notes

This tap is installed by machinists, tool and die makers, and maintenance technicians using a standard tap wrench. Before tapping, ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for a 5-40 UNC thread. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Do not force the tap against resistance; back off periodically to break chips and prevent breakage.