Guhring 9039400158750 Thread Forming Tap 5/8-11 Unc

Product Description

The GUHRING 9039400158750 is a thread forming tap designed for producing 5/8-11 UNC internal threads without cutting chips. Unlike cutting taps, this forming tap displaces material to create threads, resulting in stronger thread forms and no chip evacuation concerns. Built from High-Speed Steel-E-CO (cobalt-enriched HSS) and coated with Titanium Nitride (TiN), it delivers extended tool life in demanding production environments. The 2BX class of fit and H11/H12 thread limit provide controlled tolerance output suitable for precision threaded assemblies. It is suited for machinists and toolroom professionals running blind hole or through-hole threading operations on ferrous and non-ferrous materials.

This tap is rated for use in steel, stainless steel, cast iron, and non-ferrous metals, covering material application codes P, M, K, and N. The modified bottoming chamfer with 2-3 chamfered threads allows threading close to the bottom of blind holes while still providing enough lead for reliable thread forming. It is appropriate for both production machining and maintenance repair operations where clean, strong UNC threads are required without the risk of chip jamming in blind bores.

Key Features

• Thread forming design eliminates chips, reducing risk of chip packing in blind holes
• High-Speed Steel-E-CO (cobalt) construction for improved heat and wear resistance
• Titanium Nitride (TiN) coating extends tool life and reduces friction during forming
• Modified bottoming chamfer with 2-3 chamfered threads for close-to-bottom threading
• 6 oil grooves promote consistent lubrication along the tap body during forming
• 2BX class of fit with H11/H12 thread limit for controlled tolerance threads
• Right-hand thread direction, Series 3940

Compatibility

Designed for blind hole and through-hole threading operations in steel, stainless steel, cast iron, and non-ferrous metals. Compatible with standard 5/8-11 UNC tapping applications requiring a 2BX class of fit.

Installation Notes

Thread forming taps require tapping fluid or cutting oil appropriate for the workpiece material — do not run dry. Ensure the tap holder provides adequate float to prevent axial binding, as forming taps are more sensitive to misalignment than cutting taps. Secure the workpiece fully before tapping, and verify the pilot hole diameter matches the recommended forming tap drill size for 5/8-11 UNC to avoid overloading the tap. This tap is intended for use by qualified machinists familiar with CNC or manual tapping operations.