Osg 1709001 Spiral Point Tap 1/2-20 Unf 3 Flute Plug

Product Description

The OSG 1709001 is a spiral point plug tap designed for threading 1/2-20 UNF right-hand internal threads in demanding materials. Built from powdered metal with a steam oxide coating, it handles hardened steel, stainless steel, high-nickel alloys, and titanium without the brittleness of standard HSS tooling. The spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole tapping applications. The 2B class of fit and H5 thread limit ensure consistent tolerance control across production runs. Machinists and tool room technicians rely on this tap for precision threading in aerospace, defense, and industrial manufacturing environments.

The OSG 1709001 is used in through-hole tapping operations on materials that resist conventional tooling, including hardened steel, stainless steel, high-nickel alloys, and titanium. The plug chamfer provides a gradual lead-in that distributes cutting load across the first few threads, reducing torque and tap breakage in tougher workpiece materials. It is suited for CNC machining centers, drill presses, and tapping heads where consistent thread quality is required across medium to high production volumes.

Key Features

• Spiral point design pushes chips forward for clean through-hole threading
• Powdered metal construction offers greater toughness than standard HSS in difficult alloys
• Steam oxide coating reduces friction and improves chip flow
• Plug chamfer for progressive thread engagement and reduced tap breakage
• H5 thread limit and 2B class of fit for controlled tolerance production threading
• Rated for hardened steel, stainless steel, high-nickel alloy, and titanium applications

Compatibility

Designed for through-hole tapping of 1/2-20 UNF threads in hardened steel, stainless steel, high-nickel alloy, and titanium workpieces. Matched to 2B class of fit requirements per UNF thread standards. Series 312NI.

Installation Notes

This tap should be installed by a qualified machinist familiar with tapping speeds, feeds, and lubrication requirements for the target workpiece material. Always use a compatible cutting fluid rated for the material being tapped. Secure the workpiece and align the tap axis perpendicular to the tapped surface before engagement. Do not reverse the tap under power without confirming the machine spindle is set for the correct thread direction.