Guhring 9039970095250 Spiral Point Tap 3/8-24 Unf Tin

Product Description

The GUHRING 9039970095250 is a spiral point tap designed for through-hole threading applications in demanding materials, including stainless steel. Built from powdered metal for improved wear resistance and edge retention, it features a titanium nitride (TiN) coating that reduces friction and extends tool life in production environments. The plug chamfer eases entry into the workpiece, while the 3-flute spiral point geometry pushes chips forward ahead of the tap, keeping the thread clear during cutting. With an H3 thread limit and Class 3B fit, it produces tight-tolerance threads suited to precision assemblies. Overall length is 2.941 inches with a shank diameter of 0.381 inches.

This tap is intended for cutting 3/8-24 UNF right-hand internal threads in through-hole configurations. It is well suited for use in ferrous and stainless steel workpieces where chip evacuation and thread quality are critical. The Series 3997 designation identifies this as part of a professional-grade tapping line used by machinists and tool-room technicians in both production and job-shop settings. The plug style makes it a standard choice for machine tapping operations where a starting chamfer is appropriate.

Key Features

• Spiral point geometry pushes chips forward, ideal for through-hole tapping
• Powdered metal construction provides superior hardness and wear resistance over HSS
• TiN coating reduces friction and extends tool life, especially in stainless steel
• H3 thread limit with Class 3B fit for precise, consistent thread tolerances
• Plug chamfer for standard machine tapping entry
• Right-hand thread direction, 3 flutes, 24 threads per inch

Compatibility

Designed for through-hole threading of 3/8-24 UNF right-hand threads, with a material application rating for stainless steel. Compatible with standard tapping chucks and holders accepting a 0.381-inch shank diameter.

Installation Notes

This tap is installed and operated by machinists using a tapping head, CNC machine, or drill press with appropriate tapping chuck. Ensure the workpiece is securely fixtured and the tap is aligned perpendicular to the hole before beginning the threading cycle. Use cutting fluid rated for stainless steel to reduce heat buildup and prevent galling. Do not reverse the tap while chips are compacted, as this may damage the flutes or the thread form.