Hertel 16EL20UNJHG225T Threading Insert 20 Tpi Left Hand

Product Description

The HERTEL 16EL20UNJHG225T is a laydown-style threading insert engineered for external UNJ thread form cutting at 20 threads per inch. Manufactured from solid carbide and finished with a TiAlN coating applied via PVD process, this insert delivers the hardness and thermal resistance required for precision threading operations. The 3/8-inch inscribed circle and 0.146-inch thickness conform to the 16EL insert style geometry, providing consistent seating and repeatable thread form accuracy in compatible toolholders. It is a left-hand insert intended for specific threading directions and applications where right-hand inserts are not suitable.

This insert is suited for precision threading in metalworking and machining environments where UNJ thread standards are required, such as aerospace and defense component manufacturing. The UNJ thread form features a controlled root radius that improves fatigue strength over standard UN threads, making it a common specification in high-cycle or safety-critical assemblies. Machinists and CNC operators working with left-hand external thread applications on lathes and turning centers will find this insert fits standard 16EL toolholder pockets. Sold individually; minimum order quantity is 10 units.

Key Features

• Solid carbide substrate for high wear resistance and dimensional stability
• TiAlN coating via PVD process improves heat resistance at the cutting edge
• UNJ thread form with controlled root radius for fatigue-resistant thread profiles
• Left-hand external thread orientation for specialized machining directions
• 20 TPI pitch compatible with standard UNJ toolpath programming
• 16EL insert style geometry with 3/8-inch inscribed circle and 0.146-inch thickness

Compatibility

Designed for use in toolholders accepting the 16EL laydown insert style. Verify toolholder pocket geometry and clamp compatibility before installation. Specific compatible toolholder models were not provided in the product data.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine before changing inserts. Seat the insert fully into the toolholder pocket and secure the clamp or screw to the toolholder manufacturer's recommended procedure before resuming operation. Confirm thread hand orientation and programmed feed direction match the insert hand before cutting.