Kennametal 1542912 Hand Tap 3/4-10 Unc Plug Rh H3 Hss 4-flute

Product Description

The KENNAMETAL 1542912 is a straight-flute hand tap designed for cutting 3/4-10 UNC internal threads in a wide range of materials. It is ground to an H3 thread limit, which provides the tight tolerance control that machinists and toolroom technicians require for consistent thread fit. The tap is manufactured from high-speed steel (HSS) with a bright, uncoated finish and features a 4-flute straight-flute geometry suited for through-holes and short blind holes. With an overall length of 4.25 inches and a 2-inch thread length, this is a standard plug-chamfer hand tap built for hand tapping operations and compatible machine tapping setups.

This tap is intended for threading cast iron and non-ferrous metals. It falls within the KENNAMETAL Series 5303 and 5305 product families, making it a recognized replacement within those lines. Typical applications include maintenance and repair work, toolroom threading, and production threading where a standard UNC plug tap is specified. It is well suited to job shops, maintenance departments, and any trade environment where 3/4-10 UNC threads are required in cast iron or non-ferrous workpieces.

Key Features

• 3/4-10 UNC thread form with right-hand cutting direction
• H3 thread limit for precise tolerance control and consistent thread fit
• High-speed steel construction for durability across cast iron and non-ferrous metals
• Bright uncoated finish — no coating to affect thread tolerance stack-up
• 4-flute straight-flute geometry provides chip clearance in through-hole and short blind-hole applications
• Plug chamfer (3-5 thread lead) eases tap entry and starting in pre-drilled holes

Compatibility

Rated for use in cast iron and non-ferrous metals. Part of KENNAMETAL Series 5303 and 5305. Designed as a standard 3/4-10 UNC plug hand tap compatible with conventional tap wrenches and machine tapping chucks accepting a 0.59-inch shank diameter.

Installation Notes

Hand tapping should be performed by a machinist or toolroom technician using a properly sized tap wrench, with the workpiece securely fixtured to prevent movement. Ensure the tap drill hole is the correct size for 3/4-10 UNC threads before starting. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Back the tap off periodically to break chips and prevent tap breakage, especially in deeper holes.