Kennametal 1799405 Threading Insert 18 Tpi External Un

Product Description

The KENNAMETAL 1799405 is a carbide threading insert designed for external UN thread cutting at 18 threads per inch (TPI). It carries a TiAlN finish applied via PVD coating process, which improves wear resistance and tool life at elevated cutting temperatures. The insert is manufactured to the Top Notch series standard in grade KC5010, a coated carbide grade suited for threading steel and cast iron workpiece materials in the C3 and C4 material grade range. This insert is used by machinists and toolroom technicians running CNC lathes or manual threading operations that require consistent 60-degree included angle UN thread profiles.

The 1799405 is intended for external threading applications on right-hand threads conforming to the UN thread standard. It fits Top Notch series toolholders and is a standard replacement insert for production threading operations in metalworking environments, including job shops, aerospace component machining, and general manufacturing. The PVD TiAlN coating makes it appropriate for dry or semi-dry cutting conditions where thermal resistance is a priority.

Key Features

• TiAlN PVD coating for extended tool life and heat resistance
• 18 TPI external UN thread form with 60-degree included angle
• Right-hand cutting orientation
• Carbide substrate in manufacturer grade KC5010 for C3 and C4 material applications
• Top Notch series insert style for secure clamping in compatible toolholders
• Corner radius of 0.0071 inches (0.18 mm) for controlled thread root geometry

Compatibility

Designed for use with Top Notch series threading toolholders accepting NTC3R insert style. Compatible with UN thread standard applications in material grades C3 and C4.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel following standard insert indexing procedures for Top Notch series toolholders. Ensure the machine spindle is fully stopped and the toolholder is clear of the workpiece before seating or removing the insert. Verify torque on the clamping screw to the toolholder manufacturer specification and confirm insert seating is flush before resuming cuts. Inspect the insert edge condition regularly during production runs, as TiAlN-coated carbide inserts should be indexed or replaced at first signs of edge wear to maintain thread form accuracy.