Hertel 16ER18UNJHG225T Threading Insert 18 Tpi Solid Carbide

Product Description

The HERTEL 16ER18UNJHG225T is a solid carbide laydown threading insert designed for external UNJ thread cutting on CNC lathes and threading machines. It produces right-hand UNJ-profile threads at 18 threads per inch (TPI) and carries a PVD-applied TiAlN coating for extended tool life in ferrous and high-temperature alloy applications. The 3/8 inch inscribed circle and 0.146 inch thickness conform to standard 16ER seat geometry, making it a direct fit for compatible toolholders. Machinists and CNC operators in aerospace, defense, and precision machining shops are the primary users of this insert.

This insert is suited for external threading operations on materials including steel alloys and superalloys where UNJ thread forms are required by aerospace and fastener specifications. The UNJ thread standard features a controlled root radius that reduces stress concentrations, making it common in safety-critical and high-fatigue applications. The 16ER insert style fits standard laydown external threading toolholders with the corresponding 16ER seat. Minimum order quantity is 10 pieces; packaging is single-unit per pack.

Key Features

• Solid carbide substrate for rigidity and wear resistance in precision threading
• PVD TiAlN coating reduces heat buildup and extends tool life in alloy steels and superalloys
• Right-hand external UNJ thread form at 18 TPI with controlled root radius per UNJ standard
• 3/8 inch inscribed circle and 0.146 inch thickness fit standard 16ER laydown toolholder seats
• Manufacturer grade HG225TR optimized for threading performance across a range of workpiece materials

Compatibility

Designed for use in standard 16ER laydown external threading toolholders that accept a 3/8 inch inscribed circle insert with 0.146 inch thickness. Confirm toolholder seat geometry and clamping style before installation.

Installation Notes

Insert installation and indexing should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine before seating or replacing inserts. Use the appropriate torx or hex key to the toolholder manufacturer's specified seating procedure — do not overtighten the clamping screw. Verify thread form and pitch with a thread gauge on the first part before committing to a production run.