Guhring 9039280063500 Spiral Point Tap 1/4-20 Unc Tin Hss-e

Product Description

The GUHRING 9039280063500 is a spiral point tap designed for through-hole threading in non-ferrous metals and similar materials. It cuts a 1/4-20 UNC right-hand thread to a 2B class of fit using three flutes and a plug chamfer that guides the tap smoothly into the workpiece. The tap is manufactured from HSS-E cobalt high-speed steel and finished with a titanium nitride (TiN) coating that extends tool life by reducing friction and heat buildup at the cutting edge. Overall length is 2.5 inches with a thread length of approximately 1.181 inches, making it suited to standard-depth through-hole applications in production and maintenance machining environments.

This tap is intended for through-hole threading operations in non-ferrous metal workpieces. The spiral point geometry pushes chips ahead of the tap rather than packing them behind, which keeps the flutes clear during blind-adjacent or true through-hole passes. It carries a thread limit designation of H4/H5, appropriate for achieving consistent 2B fit tolerances in higher-volume or precision threading work. Machinists, tool-and-die technicians, and maintenance mechanics in manufacturing, HVAC fabrication, plumbing fixture shops, and general metalworking will find this tap a reliable production-grade option for 1/4-20 UNC applications.

Key Features

• 1/4-20 UNC thread form, right-hand cut, 2B class of fit for standard dimensional compliance
• HSS-E cobalt base material provides heat resistance and edge toughness beyond standard HSS
• TiN coating reduces friction and extends tool life in non-ferrous and similar materials
• Spiral point geometry pushes chips forward, keeping flutes clear during through-hole threading
• Plug chamfer provides guided entry and is the standard choice for through-hole work
• H4/H5 thread limit supports consistent 2B tolerance across production runs

Compatibility

Designed for through-hole threading of non-ferrous metals at 1/4-20 UNC with a 2B class of fit. Part of the GUHRING Series 3928 spiral point tap line.

Installation Notes

This tap is installed and used by machinists, tool-and-die technicians, and maintenance mechanics using a tap wrench, tapping head, or CNC rigid tapping cycle. Ensure the drilled pilot hole matches the correct tap drill diameter for 1/4-20 UNC before beginning the threading operation. Apply appropriate cutting fluid for the workpiece material to protect the cutting edge and improve thread finish. Inspect the tap for wear or chipping before each use and replace if the cutting edges show signs of degradation to avoid thread damage or tap breakage.