Guhring 9039010063500 Spiral Point Tap 1/4-20 Unc

Product Description

The GUHRING 9039010063500 is a spiral point tap designed for through-hole threading in steel and similar materials. It cuts a 1/4-20 UNC right-hand thread with a plug chamfer entry, making it well suited for production tapping in CNC or hand-tapping applications where the chip is pushed ahead of the tap rather than back through the flutes. Manufactured from HSS-E cobalt high-speed steel, it delivers improved heat and wear resistance over standard HSS. The bright, uncoated finish is compatible with standard cutting fluids. This tap is used by machinists, maintenance technicians, and trade professionals working in metal fabrication, mechanical assembly, and equipment repair.

This tap is intended for through-hole threading applications in ferrous materials, primarily steel. The plug chamfer provides a gradual cutting entry suitable for both new thread production and replacement threading in structural and mechanical assemblies. With a 2B class of fit, the threads it produces meet standard tolerance requirements for most bolted connections and fastener assemblies encountered in HVAC equipment, plumbing hardware, electrical enclosures, and general mechanical work. The H4/H5 thread limit designation ensures consistent oversize control for reliable thread engagement across production runs.

Key Features

• Spiral point geometry pushes chips forward, keeping the flutes clear during through-hole tapping
• HSS-E cobalt construction resists heat buildup in steel and harder ferrous materials
• Plug chamfer allows gradual thread entry for controlled cutting action
• 2B class of fit meets standard tolerance requirements for general fastener assemblies
• H4/H5 thread limit provides consistent oversize control across production use
• Bright, uncoated finish works with a wide range of standard cutting oils and fluids

Compatibility

Designed for through-hole threading of 1/4-20 UNC right-hand threads in steel. Suitable for use in CNC tapping machines, drill press setups, and hand tapping applications requiring a 2B class of fit. Series 3901.

Installation Notes

Installation is performed by machinists or qualified trade professionals using a tap wrench, tapping head, or CNC spindle configured for the correct RPM and feed rate for the material. Always apply an appropriate cutting fluid to reduce friction and extend tool life. Ensure the workpiece is securely fixtured before tapping to prevent thread misalignment. Do not reverse the tap aggressively to avoid breakage in harder materials.