Kennametal 1542252 Hand Tap 1/4-28 Unf Plug 3-flute Hss

Product Description

The KENNAMETAL 1542252 is a straight-flute hand tap designed for cutting 1/4-28 UNF internal threads in a range of workpiece materials. Built from high-speed steel with a bright, uncoated finish, this plug-chamfer tap is part of the KENNAMETAL 5305 and 5303 series. It carries a 3B class of fit and an H3 thread limit, making it suited for standard tolerance threading applications. The tap features 3 straight flutes and a right-hand thread direction. Overall length is 2.5 inches, with a thread length of 1 inch and a shank diameter of 0.255 inches. It is intended for hand tapping operations performed by machinists, toolmakers, and maintenance technicians.

This tap is appropriate for use in cast iron and non-ferrous metal workpieces. The plug chamfer, typically featuring a 3 to 5 thread lead, makes it suitable for through-hole threading and general-purpose starting applications where moderate lead-in is acceptable. It is commonly used in manual tapping setups in production, repair, and maintenance environments where precise 1/4-28 UNF thread engagement is required.

Key Features

• 1/4-28 UNF thread size with right-hand thread direction
• Plug chamfer for general-purpose through-hole and starting applications
• 3-flute straight flute geometry for hand tapping operations
• High-speed steel construction with bright, uncoated finish
• 3B class of fit and H3 thread limit for standard tolerance requirements
• Rated for cast iron and non-ferrous metal material applications

Compatibility

Designed for hand tapping 1/4-28 UNF threads in cast iron and non-ferrous metal workpieces. Part of KENNAMETAL Series 5305 and 5303.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a tap wrench or suitable hand tapping fixture. Ensure the workpiece is securely clamped and the pilot hole diameter is correct for a 1/4-28 UNF tap before beginning. Apply appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Back the tap off periodically to break chips and prevent binding, especially in cast iron.