Cleveland C54389 Hand Tap 12-28 Unf Taper 4-flute Hss

Product Description

The CLEVELAND C54389 is a 12-28 UNF hand tap designed for cutting right-hand internal threads in a range of ferrous and non-ferrous materials. Built from high speed steel with a bright uncoated finish, this tap features a taper chamfer, 4-flute straight flute geometry, and meets Thread Limit H3 tolerances. It produces threads conforming to Class 2B and 3B fit standards. With an overall length of 2.375 inches and a thread length of 0.5 inches, it is suited for precision threading work in both blind hole and through-hole applications. Machinists, tool-and-die makers, and maintenance technicians reach for this tap when cutting fine-pitch threads in production or repair settings.

The C54389 is appropriate for use in residential maintenance shops, commercial fabrication environments, and industrial facilities. It cuts 12-28 UNF threads and is rated for use in alloy steel, aluminum, carbon steel, and free-machining stainless steel. The taper chamfer eases entry into the hole and distributes cutting load across multiple leading threads, making it a reliable choice for manual tapping operations where starting alignment is critical.

Key Features

• 12-28 UNF thread form, right-hand, Class 2B and 3B fit
• Taper chamfer for smooth thread entry and reduced starting torque
• 4-flute straight flute design for chip clearance in through-hole and blind hole work
• High speed steel construction for durability across a broad range of workpiece materials
• Bright uncoated finish, Thread Limit H3, Series 1001
• Shank diameter of 0.22 inches with a 0.165-inch square drive for standard tap wrench fitment

Compatibility

Designed for use in alloy steel, aluminum, carbon steel, and free-machining stainless steel workpieces. Suitable for both blind hole threading and through-hole threading applications requiring a 12-28 UNF thread form.

Installation Notes

Hand taps are installed by machinists or maintenance technicians using a standard tap wrench sized to the square drive. The workpiece should be securely clamped and the hole drilled to the correct tap drill diameter for a 12-28 UNF thread before tapping begins. Apply cutting fluid appropriate to the workpiece material to extend tool life and improve thread finish. Back the tap off periodically to break chips, particularly in blind hole applications.