Guhring 9039280079380 Spiral Point Tap 5/16-18 Unc Tin

Product Description

The GUHRING 9039280079380 is a spiral point tap designed for right-hand through-hole threading in 5/16-18 UNC applications. Built from HSS-E cobalt high-speed steel and finished with a titanium nitride (TiN) coating, this tap delivers extended tool life in non-ferrous metal applications. It carries a 3-flute, plug chamfer configuration with a 2B class of fit and an H4/H5 thread limit. Overall length is 2.721 inches, thread length is 1.377 inches, and shank diameter is 0.318 inches. Licensed machinists and maintenance technicians use this tool wherever consistent thread quality and coated-tool longevity are required.

This tap is suited for through-hole threading operations in non-ferrous metals such as aluminum, brass, and copper alloys. The spiral point geometry pushes chips forward ahead of the cut, making it well matched to CNC tapping centers, drill presses, and hand-tap applications in production or MRO environments. The plug chamfer allows progressive thread engagement at the start of the cut, reducing the chance of tap breakage on entry. Series 3928 taps from GUHRING are a standard choice in precision machining and general manufacturing shops requiring reliable UNC thread production.

Key Features

• 5/16-18 UNC thread size with 2B class of fit and H4/H5 thread limit for consistent dimensional tolerance
• HSS-E cobalt construction for improved heat and wear resistance over standard HSS
• TiN coating reduces friction and extends tool life in non-ferrous material applications
• 3-flute spiral point design pushes chips forward, ideal for through-hole tapping
• Plug chamfer provides gradual thread engagement for smooth tap entry
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for through-hole threading in non-ferrous metals with 5/16-18 UNC thread requirements. Fits standard tap holders and chucks accepting a 0.318-inch shank diameter.

Installation Notes

This tap should be installed by a qualified machinist or tooling technician using a properly sized tap holder or chuck rated for the shank diameter. Ensure the workpiece is securely fixtured and the spindle or tap driver is aligned perpendicular to the hole before engagement. Apply an appropriate cutting fluid for non-ferrous materials to maintain tool life and thread quality. Inspect the tap for wear or chipping before each use and replace if cutting edges show degradation.