Cleveland C54470 Hand Tap 1/4-28 Unf Plug 4-flute Hss

Product Description

The CLEVELAND C54470 is a straight-flute hand tap designed for cutting 1/4-28 UNF internal threads in both blind and through-hole applications. Manufactured from high speed steel with a bright uncoated finish, it features a plug chamfer for easy thread starting and four flutes for efficient chip evacuation. The tap measures 2.5 inches overall with a thread length of 0.63 inches and conforms to Class 3B fit with an H3 thread limit. It is well suited for production and maintenance threading operations across a range of workpiece materials including alloy steel, aluminum, carbon steel, and free-machining stainless steel.

The C54470 belongs to Cleveland Series 1002 and is built for use in hand tapping setups or light machine tapping where a right-hand, straight-flute tap is appropriate. Its plug chamfer engages threads gradually, making it a practical choice for both starting threads in through-holes and completing threaded blind holes where chip clearance is manageable. Machinists and maintenance technicians working in job shops, manufacturing facilities, and MRO environments will find this tap reliable for moderate-volume threading tasks.

Key Features

• 1/4-28 UNF thread form, right-hand cut, Class 3B fit with H3 thread limit
• Plug chamfer for controlled thread engagement in blind and through-hole applications
• Four straight flutes promote chip flow and consistent thread form
• High speed steel construction provides hardness and wear resistance across common workpiece materials
• Bright uncoated finish suits general-purpose threading without specialized coating requirements
• Shank diameter of 0.255 inches with a 5/16-inch square drive for standard tap wrench compatibility

Compatibility

Rated for use in alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces. Suitable for blind hole threading and through-hole threading applications per Series 1002 design standards.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench or suitable tapping fixture. Always ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1/4-28 UNF thread before beginning the threading operation. Apply appropriate cutting fluid for the workpiece material to reduce friction and extend tool life. Back the tap off periodically to break chips when threading blind holes.