Kennametal 1542589 Hand Tap 3/8-16 Unc Plug 4-flute Hss

Product Description

The KENNAMETAL 1542589 is a straight-flute hand tap designed for cutting right-hand internal threads to a 3/8-16 UNC specification. Built from high-speed steel with a bright uncoated finish, it delivers consistent thread form in a range of shop and field applications. The plug chamfer provides a gradual lead-in, making it well suited for through-hole threading where partial thread engagement is acceptable before full depth is reached. At 2.94 inches overall length with a 1.25-inch thread length, this tap fits standard tap wrenches and T-handle drivers used by machinists and maintenance technicians.

This tap is rated for use in cast iron and non-ferrous metals, covering a broad range of common workpiece materials encountered in general machining, maintenance, and fabrication work. The 4-flute straight-flute geometry produces clean thread form in these materials while allowing chip clearance with standard cutting fluid application. It is sized for 3/8-16 UNC threading, one of the most common unified coarse-thread sizes in North American trade applications, and is appropriate for both bench work and in-place repair tapping.

Key Features

• 3/8-16 UNC thread form, right-hand cut, Class 3B fit with H3 thread limit
• Plug chamfer provides gradual lead-in for through-hole threading
• High-speed steel construction for durability across cast iron and non-ferrous workpieces
• Bright uncoated finish, compatible with standard cutting oils and fluids
• 4-flute straight-flute design for clean thread form and chip clearance
• 2.94 inches overall length fits standard tap wrenches and T-handle drivers

Compatibility

Designed for 3/8-16 UNC through-hole threading in cast iron and non-ferrous metals. Part of KENNAMETAL Series 5305 and 5303.

Installation Notes

Machining and maintenance trades install hand taps using a calibrated tap wrench or T-handle; ensure the tap is started square to the workpiece to prevent thread misalignment or breakage. Apply appropriate cutting fluid for the workpiece material before and during tapping. Do not force the tap — back off a quarter turn periodically to break chips. Replace worn taps rather than regrinding to maintain Class 3B thread tolerance.