Guhring 9039160222250 Spiral Point Tap 7/8-9 Unc Tin

Product Description

The GUHRING 9039160222250 is a spiral point tap designed for through-hole threading in steel applications. It cuts a 7/8-9 UNC right-hand thread to a 2B class of fit and is manufactured from HSS-E cobalt high-speed steel for improved wear resistance and heat tolerance compared to standard HSS. A titanium nitride (TiN) coating further extends tool life and reduces friction during cutting. With four flutes and a plug chamfer, this tap drives chips forward through the hole, making it well-suited for production tapping on through-hole work. Licensed machinists, tool-and-die makers, and maintenance mechanics are the primary users of this tap.

This tap is built for through-hole threading in steel at the 7/8-9 UNC thread size. The plug chamfer provides a gradual thread lead-in, which helps reduce entry force in moderate-to-hard materials. The H6/H7 thread limit designation supports consistent fit tolerances across production runs. It is commonly used in machine shops, MRO environments, and heavy equipment manufacturing where UNC fastener threads are standard. The 4.689-inch overall length provides clearance for use in standard tap holders and CNC rigid-tap setups.

Key Features

• 7/8-9 UNC thread form, right-hand cut, 2B class of fit
• HSS-E cobalt construction for elevated heat and wear resistance
• TiN coating reduces friction and extends cutting life
• Plug chamfer (4-5 thread lead-in) for through-hole applications
• 4 flutes with spiral point geometry to push chips forward through the hole
• H6/H7 thread limit for consistent tolerance control in production use

Compatibility

Designed for through-hole threading in steel. Compatible with standard tap holders, drill presses, and CNC machining centers configured for 7/8-9 UNC tapping with rigid or floating tap holders.

Installation Notes

This tap should be installed in a properly sized tap holder that matches the shank diameter to ensure concentricity and prevent slippage. Always ensure the workpiece is securely fixtured and the spindle speed is set per the tap manufacturer guidelines for the material being threaded. Use appropriate cutting fluid for steel to reduce heat buildup and improve thread quality. Inspect the tap for chipping or wear before each use and do not force a worn tap, as breakage in the bore can result in costly extraction work.