Hertel 16IR20UNJHG225T Threading Insert 20 Tpi 3/8 Ic

Product Description

The HERTEL 16IR20UNJHG225T is a solid carbide laydown threading insert engineered for internal UNJ thread cutting at 20 threads per inch. Built to insert style 16IR, it features a 3/8 inch (0.3750 inch) inscribed circle and a thickness of 0.146 inches. The TiAlN coating is applied via a PVD process, delivering a hard, wear-resistant surface layer that extends tool life in demanding threading operations. This insert is designed for right-hand internal threading and is used by machinists and toolroom professionals working on precision thread forms to UNJ standards.

This insert is suited for internal UNJ threading applications where controlled thread form and tight tolerances are required. UNJ threads feature a controlled root radius that improves fatigue strength compared to standard UN threads, making them common in aerospace and high-cycle mechanical assemblies. The 16IR style seats as a laydown insert in compatible toolholders, and the solid carbide substrate provides rigidity and dimensional stability across a range of materials and cutting conditions.

Key Features

• Solid carbide substrate for rigidity and wear resistance in threading operations
• TiAlN coating applied by PVD process for extended tool life and thermal resistance
• 20 TPI internal UNJ thread form with controlled root radius geometry
• Right-hand cut orientation for standard internal threading setups
• 3/8 inch inscribed circle with 0.146 inch thickness per 16IR insert style
• Manufacturer grade HG225TR suited to a broad range of workpiece materials

Compatibility

Designed for use in 16IR-style laydown threading insert toolholders that accept a 3/8 inch inscribed circle insert. Verify toolholder seat geometry and pocket dimensions before installation.

Installation Notes

Installation is performed by machinists or toolroom technicians following standard insert seating procedures for laydown threading toolholders. Ensure the machine spindle is fully stopped and the toolholder is secure before seating or replacing the insert. Use the appropriate torque wrench and insert screw per the toolholder manufacturer specification — do not overtighten, as carbide inserts are brittle and can fracture under excess clamping force. Confirm insert orientation matches the right-hand internal thread direction before beginning a cut.