Osg 31420508 Spiral Point Sti Tap 10-32 Unf 3 Flute

Product Description

The OSG 31420508 is a spiral point STI tap designed for cutting 10-32 UNF threads in a variety of metalworking and repair applications. Spiral point geometry pushes chips ahead of the tap and into the hole, making it well suited for through-hole tapping operations. The tap is manufactured from powdered metal and carries a V finish, which supports wear resistance during production runs. With a 2B class of fit and an H3 thread limit, it produces accurate, standard-tolerance threads compatible with 10-32 UNF fastener systems. The 3-flute, plug chamfer configuration makes it a practical choice for machinists, maintenance technicians, and tool-and-die professionals working in industrial or manufacturing environments.

This tap is used in through-hole tapping scenarios where chip evacuation is critical to thread quality and tool life. The plug chamfer provides a gradual lead-in, making it appropriate for starting in pre-drilled holes and running through materials such as steel, aluminum, and similar metals. The powdered metal construction suits repetitive tapping cycles in production settings. Technicians and machinists performing STI (Screw Thread Insert) thread repair or original equipment manufacturing will find this tap fits standard STI tooling setups for 10-32 UNF applications.

Key Features

• Spiral point geometry pushes chips forward for clean through-hole tapping
• Powdered metal construction provides durability in production-volume use
• V finish supports wear resistance and smooth cutting action
• Plug chamfer allows gradual thread engagement from a pre-drilled hole
• H3 thread limit and 2B class of fit deliver standard-tolerance 10-32 UNF threads
• 3-flute design balances chip clearance with thread support

Compatibility

Designed for STI tapping applications requiring 10-32 UNF threads with a 2B class of fit, compatible with standard STI insert systems and toolholders accepting a 0.255-inch shank diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard tap wrench, tapping head, or CNC machine toolholder. Always ensure the workpiece is secured and the pilot hole is drilled to the correct STI tap drill size before tapping. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Do not reverse the tap aggressively under power, as this can cause breakage in harder materials.