Guhring 9039280158750 Spiral Point Tap 5/8-11 Unc Tin Hss-e

Product Description

The GUHRING 9039280158750 is a spiral point tap designed for right-hand through-hole threading in 5/8-11 UNC applications. Built from HSS-E cobalt high-speed steel and finished with a TiN (titanium nitride) coating, this tap delivers extended tool life in non-ferrous metal applications. The plug chamfer provides a gradual thread lead-in, making it well suited for through-hole work where chip evacuation is critical. With 3 flutes, an overall length of 3.811 inches, and a thread length of 1.875 inches, this tap meets 2B class of fit tolerances at H5/H6 thread limits. Licensed machinists and maintenance technicians will find this tap appropriate for production and repair threading operations.

This tap is intended for through-hole threading in non-ferrous metals such as aluminum, brass, and copper alloys. The spiral point geometry pushes chips forward ahead of the tap rather than packing them into the flutes, reducing the risk of breakage in production environments. The TiN coating reduces friction and wear, extending service intervals between tool changes. It is part of the GUHRING Series 3928 and is sized for 5/8-11 UNC thread form, which is common in structural fastener applications, machine bases, and equipment frames.

Key Features

• 5/8-11 UNC thread form with 2B class of fit and H5/H6 thread limit for consistent tolerance control
• HSS-E cobalt base material provides higher heat and wear resistance compared to standard HSS
• TiN coating reduces friction and extends tool life in non-ferrous metal cutting
• Spiral point geometry pushes chips forward — optimized for through-hole threading operations
• Plug chamfer (3-5 thread lead) allows smooth entry and accurate thread start
• Right-hand thread direction, no coolant-through requirement, no interrupted thread design needed

Compatibility

Designed for through-hole threading in non-ferrous metals. Suitable for use in standard 5/8-11 UNC tapping applications where a 2B class of fit is specified.

Installation Notes

This tap should be installed in a rigid tapping holder or CNC tapping head to minimize runout and avoid breakage. Always ensure the workpiece is securely fixtured and the pilot hole diameter is correct for a 5/8-11 UNC tap before beginning the threading operation. Apply appropriate cutting fluid for non-ferrous materials to improve finish and protect the coating. Reverse the tap periodically during hand-tapping operations to break chips and prevent binding.