Osg 1708708 Spiral Point Tap 1/2-13 Unc Ticn Powdered Metal

Product Description

The OSG 1708708 is a spiral point plug tap designed for right-hand threading in demanding materials including hardened steel, stainless steel, high-nickel alloy, and titanium. Built from powdered metal and coated with TiCN, this tap delivers the wear resistance and toughness required for production tapping in tough-to-machine alloys. It cuts a 1/2-13 UNC thread to a 3B class of fit with an H3 thread limit, making it suitable for applications requiring controlled tolerance. The three-flute spiral point geometry pushes chips forward through the hole, keeping the cutting zone clear during through-hole operations.

This tap is intended for through-hole tapping in industrial and shop environments where stainless steels, titanium, and high-nickel alloys are regularly machined. The Series 312NI designation indicates this tool is optimized for nickel-based and high-temperature alloys, making it a practical choice for aerospace, oil and gas, and heavy industrial machining where standard high-speed steel taps fail prematurely. Licensed machinists and CNC operators working with production runs will benefit from the TiCN coating, which extends tool life in abrasive materials.

Key Features

• 1/2-13 UNC thread form with H3 thread limit and 3B class of fit for controlled tolerance threading
• Powdered metal construction provides superior toughness and wear resistance over standard HSS
• TiCN coating reduces friction and extends tool life in hardened and abrasive materials
• Three-flute spiral point geometry pushes chips forward, suited for through-hole applications
• Plug chamfer style for standard production tapping where the tap does not need to start in a blind hole
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed for through-hole tapping in hardened steel, stainless steel, high-nickel alloy, and titanium workpieces requiring a 1/2-13 UNC right-hand thread. Series 312NI is specifically engineered for nickel-based and high-temperature alloys.

Installation Notes

This tap is installed by machinists using a tapping head, CNC machine, or hand tap wrench with appropriate torque control. Always ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 1/2-13 UNC thread before tapping. Use a cutting fluid or tapping compound rated for the workpiece material, particularly when working with stainless steel or nickel alloys, to prevent galling and extend tool life. Do not reverse the tap under load without allowing chips to clear.