Cleveland C57181 Spiral Point Tap 3/8-24 Unf Hss

Product Description

The CLEVELAND C57181 is a spiral point tap designed for through-hole threading in ferrous and non-ferrous metals. It cuts a 3/8-24 UNF right-hand thread with a plug chamfer, driving chips forward ahead of the tap to keep the flutes clear during the cut. Built from high speed steel with a bright finish, it handles alloy steel, carbon steel, and aluminum in production and maintenance threading applications. The H3 thread limit holds a 3B class of fit, making it suitable for standard fastener assemblies. Overall length is 2.9375 inches with a thread length of 0.75 inches.

This tap is used in through-hole threading operations on drill presses, CNC machining centers, tapping machines, and manual tapping setups. The plug chamfer — typically 3 to 5 threads of lead — makes it appropriate for starting a thread in a through hole where full thread engagement is needed from the outset. Material applications include alloy steel, carbon steel, and aluminum, covering a wide range of industrial and maintenance machining work. The 3-flute geometry provides a balance between chip clearance and tool rigidity at this diameter.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• H3 thread limit for consistent 3B class of fit on 3/8-24 UNF threads
• High speed steel construction handles alloy steel, carbon steel, and aluminum
• Plug chamfer provides a gradual lead-in suitable for through-hole threading
• Right-hand cut, bright finish, no coolant-through requirement
• Series 1011 design with 3 flutes for balanced chip evacuation and rigidity

Compatibility

Designed for through-hole threading applications requiring a 3/8-24 UNF thread form with a 3B class of fit in alloy steel, carbon steel, and aluminum workpieces.

Installation Notes

Threading operations should be performed by a qualified machinist following standard shop safety procedures. Ensure the workpiece is securely fixtured and the spindle speed is set to a value appropriate for the tap diameter and workpiece material before engaging the tap. Apply a suitable cutting fluid for the workpiece material to extend tool life and improve thread quality. Do not reverse the tap under power without confirming the tapping attachment or machine is set up for reversing operation.