Cleveland C57642 Spiral Point Tap 5/8-18 Unc Hss Oxide

Product Description

The CLEVELAND C57642 is a spiral point tap designed for through-hole threading operations in ferrous and cast iron workpieces. Manufactured from high speed steel with an oxide finish, this tap drives chips forward ahead of the cutting zone, making it well-suited for continuous through-hole applications where chip evacuation is a priority. It carries a 5/8-18 UNC thread form, a plug chamfer for progressive thread engagement, and a Class 2B thread limit designation of H3. Overall length is 3.8125 inches with a thread length of 1.8125 inches. Machinists and tool-and-die technicians rely on this geometry for consistent thread quality in production and maintenance environments.

This tap is intended for right-hand through-hole threading in cast iron and steel. The plug chamfer requires a pre-drilled through-hole and is not suited for blind-hole applications without modification to the tapping sequence. It is appropriate for both manual tapping setups and machine tapping on drill presses, CNC machining centers, and turret lathes where coolant-through is not required. The 3-flute configuration balances chip clearance with cutting edge strength at this diameter.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole threading
• High speed steel construction provides durability in cast iron and steel applications
• Oxide finish improves lubricity and surface wear resistance
• Plug chamfer allows progressive thread engagement over several leading threads
• H3 thread limit and Class 2B fit for standard commercial thread tolerance
• Right-hand cut, 3-flute design balances chip clearance and edge integrity

Compatibility

Designed for through-hole threading in cast iron and steel workpieces with a 5/8-18 UNC thread form and Class 2B fit requirement.

Installation Notes

Installation is performed by qualified machinists or maintenance technicians familiar with tapping operations. Ensure the workpiece is securely clamped and the pilot hole diameter is correct for a 5/8-18 UNC tap before beginning. Use an appropriate cutting fluid or tapping oil for the workpiece material to extend tool life and improve thread finish. Coolant-through is not supported on this tap; apply cutting fluid externally before and during the tapping cycle.