Hertel 16ER16UNJHG225T Threading Insert 16 Tpi Unj Carbide

Product Description

The HERTEL 16ER16UNJHG225T is a solid carbide laydown threading insert designed for external UNJ thread-form cutting at 16 threads per inch. Built to the UNJ standard, this right-hand insert features a TiAlN coating applied via PVD process, which improves surface hardness and heat resistance during high-speed threading operations. With a 3/8-inch inscribed circle and a thickness of 0.146 inches, it fits standard ER-style insert pockets on CNC lathes and threading toolholders. Machinists and toolroom operators working on aerospace-grade and high-tolerance threaded components will find this insert well-suited to demanding external threading applications.

This insert is intended for external threading operations requiring UNJ thread form compliance, which specifies a controlled root radius to reduce stress concentration in critical fastener applications. Typical use cases include threading of aerospace fasteners, hydraulic fittings, and other high-strength components where UNJ geometry is specified. The 16-style insert designation indicates it is compatible with ER-series laydown insert pockets of the appropriate size. It is installed in a right-hand orientation and is suited for both roughing and finishing passes depending on depth-of-cut and feed rate parameters set by the operator.

Key Features

• Solid carbide substrate for rigidity and wear resistance in threading operations
• TiAlN PVD coating enhances heat resistance and extends tool life in ferrous materials
• UNJ external thread form with controlled root radius for aerospace and high-stress applications
• 16 TPI cutting geometry for consistent thread pitch accuracy
• Right-hand, laydown-style insert for use in ER-series toolholders
• 3/8-inch inscribed circle fits standard ER-pocket toolholding systems

Compatibility

Designed for use in ER-style laydown threading toolholders that accept 16-series external threading inserts with a 3/8-inch inscribed circle.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians on CNC or manual lathes. Ensure the machine spindle is fully stopped and locked out before seating or removing the insert. Use the correct torx or clamp screw specified by the toolholder manufacturer to secure the insert — do not overtighten, as solid carbide inserts are brittle and susceptible to fracture under excessive clamping force. Verify insert pocket seating surface is clean and free of chips before installation.