Kennametal 4131289 Hand Tap 1/4-20 Plug Hss 4-flute Unf

Product Description

The KENNAMETAL 4131289 is a 1/4-20 straight flute hand tap designed for cutting internal threads in a range of metalworking applications. Built from high-speed steel (HSS) with a bright, uncoated finish, this plug chamfer tap is suited for through-hole and intermediate threading operations where controlled material removal is the priority. It carries a Class 2B thread fit and an H5 thread limit, delivering consistent tolerance control across production and maintenance threading tasks. With a 3.38-inch overall length and a 1.656-inch thread length, the tap fits standard tap wrench setups used by machinists and maintenance technicians alike.

This tap is rated for use in cast iron and non-ferrous metals, making it a dependable choice for general machining, fabrication shops, and maintenance repair operations. The 4-flute straight flute design provides good chip control in shorter-chipping materials. It follows the UNF thread standard at 1/4-20, a common fastener thread size found across mechanical assemblies, fixtures, and equipment frames. The tap is part of KENNAMETAL Series 5305 and 5303, sold individually with no minimum order quantity beyond one piece.

Key Features

• 1/4-20 UNF right-hand thread, Class 2B fit with H5 thread limit for precise tolerance control
• Plug chamfer style supports through-hole and blind-hole threading in intermediate applications
• High-speed steel construction with bright uncoated finish for general-purpose metalworking
• 4-flute straight flute geometry performs well in cast iron and non-ferrous metals
• 3.38-inch overall length with 0.367-inch shank diameter fits standard tap wrenches and holders
• No coolant-through requirement simplifies setup in manual and light-duty machine tapping

Compatibility

Rated for threading cast iron and non-ferrous metal workpieces. Part of KENNAMETAL Series 5305 and 5303. Designed as a standard hand tap for use with conventional tap wrenches and manual tapping setups in 1/4-20 UNF thread applications.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard tap wrench. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for a 1/4-20 UNF thread before tapping. Apply appropriate cutting fluid for the material being tapped to extend tool life and improve thread quality. Do not force the tap if resistance increases unexpectedly - back off to break chips and re-engage.