Osg 1712801 Spiral Point Sti Tap 8-32 Unc 3 Flute

Product Description

The OSG 1712801 is a spiral point STI plug tap designed for cutting 8-32 UNC internal threads in through-hole applications. Built from vanadium high-speed steel with an oxide finish, it provides solid wear resistance and chip control under production tapping conditions. The spiral point geometry pushes chips ahead of the tap and out of the hole, reducing clogging and breakage risk. With 3 flutes, an H2 thread limit, and a plug chamfer, it suits general-purpose through-hole tapping where thread accuracy and tool life are the priority. Overall length is 2.382 inches with a thread length of 0.44 inches.

This tap is used in machining, maintenance, repair, and fabrication environments where 8-32 UNC threads are required. It fits standard tapping operations on steel, aluminum, and similar materials in through-hole configurations. The plug chamfer requires some starting clearance, making it appropriate for holes that pass fully through the workpiece. Machinists, tool-and-die technicians, and maintenance mechanics commonly use this tap on manual machines and CNC tapping centers alike.

Key Features

• Spiral point geometry pushes chips forward through the hole, reducing packing and tap breakage
• Vanadium high-speed steel construction provides elevated heat and wear resistance over standard HSS
• Oxide finish improves lubricity and corrosion resistance during operation
• Plug chamfer with 3-5 lead threads for through-hole tapping applications
• H2 thread limit for close-tolerance 8-32 UNC threads
• 3 flutes balance chip clearance with core strength at this thread size

Compatibility

Designed as an OEM-style replacement or direct-use tap for 8-32 UNC through-hole tapping operations in standard tap holders, collet chucks, and tapping attachments accepting a 0.22-inch shank diameter.

Installation Notes

Use the correct tap drill size for 8-32 UNC threads before tapping and ensure the workpiece is securely fixtured. Apply cutting fluid appropriate for the workpiece material to extend tool life and improve thread finish. Power down any machine spindle and confirm zero rotation before loading or unloading the tap. Follow applicable shop safety procedures and manufacturer recommendations for tapping speeds.