Osg 1707108 Spiral Point Tap 1/4-20 Unc Ticn Coated

Product Description

The OSG 1707108 is a spiral point tap designed for threading 1/4-20 UNC holes in demanding materials. Built from powdered metal and coated with TiCN for extended tool life, this plug-chamfer tap is engineered for right-hand threading in hardened steel, stainless steel, high-nickel alloys, and titanium. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole applications. With a 3B class of fit and H3 thread limit, it produces threads to close tolerances required in precision assemblies. Licensed machinists and tool-and-die tradespeople will find it fits standard tap holders and CNC tapping cycles.

This tap is used in production and maintenance machining environments where through-holes require consistent 1/4-20 UNC threads in tough or abrasive workpiece materials. The TiCN coating reduces friction and heat buildup, extending service intervals compared to uncoated tooling. It is appropriate for manual tapping, drill press setups, and CNC machining centers that support rigid or floating tap holders. The 312NI series designation indicates suitability for nickel alloys and titanium in addition to stainless and hardened steel applications.

Key Features

• 1/4-20 UNC thread form, right-hand cut, 3B class of fit with H3 thread limit
• 3-flute spiral point design pushes chips forward for through-hole threading
• Powdered metal construction provides wear resistance in abrasive materials
• TiCN coating reduces friction and extends tool life in hardened and high-alloy steels
• Plug chamfer for general-purpose through-hole starting and threading
• No coolant-through requirement — compatible with flood or external coolant delivery

Compatibility

Designed for threading 1/4-20 UNC through holes in hardened steel, stainless steel, high-nickel alloy, and titanium workpieces. Part of the OSG 312NI series.

Installation Notes

Installation should be performed by a qualified machinist following standard tapping procedures. Ensure the workpiece is securely fixtured and the spindle is properly aligned before engaging the tap. Use appropriate cutting fluid or coolant for the workpiece material to prevent galling, particularly with stainless steel and nickel alloys. Inspect the tap for wear or chipping between uses and replace before thread quality degrades.