Guhring 9039080127000 Spiral Point Tap 1/2-20 Unf Tin

Product Description

The GUHRING 9039080127000 is a spiral point tap designed for through-hole threading in a 1/2-20 UNF configuration. Built from High-Speed Steel-E-PM (HSS-E-PM) with a titanium nitride (TiN) coating, it delivers hardness and wear resistance suited for threading stainless steel and other demanding materials. The plug chamfer eases entry and distributes cutting load across multiple leading threads. With 4 flutes and a right-hand thread direction, this tap pushes chips forward ahead of the cut, making it well-suited for through-hole applications. The 2B class of fit meets standard UNF tolerance requirements for general mechanical assembly. Machinists and maintenance professionals install this tap in CNC machining centers, drill presses, and tapping machines.

This tap is intended for through-hole threading operations in ferrous and non-ferrous materials, with a listed material application of stainless steel. The H4/H5 thread limit provides the oversize allowance needed to account for material springback in tougher alloys. It is appropriate for production and job-shop environments where consistent UNF thread quality is required. The 1/2-20 UNF size is common in precision mechanical, hydraulic, and instrumentation assemblies. Series 3908 is GUHRING's standard line for spiral point plug taps in this configuration.

Key Features

• HSS-E-PM construction provides elevated hardness and edge retention versus conventional HSS
• TiN coating reduces friction and extends tool life in stainless steel and alloy applications
• Plug chamfer (approximately 3-5 lead threads) allows controlled entry and load distribution
• Spiral point geometry pushes chips forward, keeping the flutes clear in through-hole cuts
• H4/H5 thread limit accommodates material springback for accurate 2B class of fit results
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed for through-hole threading of 1/2-20 UNF threads in stainless steel and similar materials. Suitable for use in tapping machines, CNC machining centers, and drill presses capable of running taps in the 1/2-inch range with appropriate torque control.

Installation Notes

This tap should be installed by a qualified machinist or tooling professional familiar with tapping speeds, feeds, and appropriate cutting fluid selection for the workpiece material. Secure the workpiece fully before beginning the tapping cycle and ensure the spindle is aligned perpendicular to the drilled hole. Use a cutting fluid rated for stainless steel when threading in that material to prevent galling and premature tool wear. Do not force the tap if resistance increases unexpectedly — back off and clear chips before continuing.