Guhring 9039970142880 Spiral Point Tap 9/16-18 Unf

Product Description

The GUHRING 9039970142880 is a spiral point tap designed for through-hole threading in demanding applications. Built from powdered metal and finished with a titanium nitride (TiN) coating, this tap delivers extended wear resistance when cutting threads in stainless steel and similarly tough materials. It produces a 9/16-18 UNF thread to a 3B class of fit with an H3 thread limit, providing precise, consistent results. The plug chamfer makes it suited for through-hole work where the tap can advance fully through the workpiece. With a 3.591-inch overall length and 4 flutes, it is used by machinists and maintenance technicians on CNC and manual lathes, drill presses, and tapping machines.

This tap is intended for through-hole threading operations in production and maintenance environments. The 9/16-18 UNF designation places it in the fine-thread unified national series, commonly specified in aerospace, automotive, and general industrial assemblies where fine thread engagement and vibration resistance are priorities. The TiN coating reduces friction and built-up edge, making it a reliable choice when threading stainless steel and other work-hardening alloys. It is a right-hand tap and is used with standard cutting or tapping fluids appropriate to the workpiece material.

Key Features

• 9/16-18 UNF thread form, 3B class of fit, H3 thread limit for precise tolerance control
• Powdered metal construction for improved toughness and wear resistance over standard HSS
• TiN coating reduces friction and extends tool life in stainless steel and hard materials
• Plug chamfer for through-hole threading applications
• 4-flute spiral point design pushes chips ahead of the tap, keeping flutes clear
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed for through-hole threading of 9/16-18 UNF threads, with a material application rating for stainless steel. Part of GUHRING Series 3997.

Installation Notes

Installation should be performed by a qualified machinist following standard tapping procedures. Ensure the workpiece is securely fixtured and the tap is aligned on-axis with the pilot hole before engagement. Always use an appropriate cutting fluid or tapping compound for the workpiece material, especially when threading stainless steel, to prevent galling and tool breakage. Inspect the tap for wear or chipping before each use and replace if cutting edges are degraded.