Guhring 9039080079380 Spiral Point Tap 5/16-24 Unf Tin

Product Description

The GUHRING 9039080079380 is a spiral point tap designed for right-hand through-hole threading in 5/16-24 UNF applications. Built from High-Speed Steel-E-PM (powder metallurgy HSS) with a TiN coating, it delivers extended tool life in demanding materials including stainless steel. The tap features a plug chamfer for gradual thread engagement and three flutes for efficient chip evacuation forward through the hole. With an overall length of 2.721 inches and a thread length of 0.709 inches, it fits standard tapping chucks and CNC rigid-tapping setups. Machinists, tool-and-die workers, and maintenance technicians use this tap where precise 2B class of fit threads are required in through-hole configurations.

This tap is suited for through-hole threading in ferrous and non-ferrous materials, with a stated material application of stainless steel. The TiN coating reduces friction and resists built-up edge, making it effective in production environments where tool changes slow throughput. It carries an H3/H4 thread limit designation, which is appropriate for standard 2B tolerance threading in UNF fastener applications. The 5/16-24 UNF thread form is common in precision mechanical assemblies, automotive components, and structural fastening applications where fine thread engagement is specified.

Key Features

• Spiral point geometry pushes chips forward, keeping flutes clear during through-hole operations
• High-Speed Steel-E-PM substrate provides toughness and wear resistance beyond standard HSS
• TiN coating lowers friction and extends tool life in stainless steel and similar materials
• Plug chamfer with 3-5 thread lead allows gradual entry and reduced torque at start
• H3/H4 thread limit ensures consistent 2B class of fit across production runs
• Right-hand cut, no coolant-through requirement — compatible with flood coolant or cutting oil at the surface

Compatibility

Designed for through-hole threading in 5/16-24 UNF applications. Stated material application is stainless steel. Part of GUHRING Series 3908. No specific machine or holder compatibility was provided in the product data.

Installation Notes

This tap is installed by qualified machinists or maintenance technicians using a tapping chuck, tap wrench, or CNC rigid-tapping spindle. Always ensure the workpiece is securely fixtured and the spindle is properly aligned before engaging the tap to avoid thread runout or tool breakage. Use an appropriate cutting fluid or tapping compound, particularly when working in stainless steel, to reduce heat and extend tool life. Follow your machine tool manufacturer guidelines and applicable shop safety procedures when setting torque limits and feed rates.