Hertel 16EL32UNJHG225T Threading Insert 32 Tpi Left Hand

Product Description

The HERTEL 16EL32UNJHG225T is a solid carbide laydown threading insert designed for left-hand external UNJ thread cutting on CNC lathes and threading machines. Built to the 16 EL insert style, it carries a TiAlN coating applied via PVD process, which improves surface hardness and heat resistance during high-speed threading operations. The insert cuts at 32 threads per inch (TPI) and features a 3/8 inch inscribed circle (0.3750 inches) with a thickness of 0.1460 inches. It is intended for use by machinists and tool and die professionals working with aerospace-standard UNJ thread forms.

This insert is suited for production threading applications where left-hand external UNJ thread profiles are required. UNJ threads feature a controlled root radius that improves fatigue resistance, making this insert common in aerospace, defense, and precision mechanical assembly work. It is compatible with toolholders designed for 16 EL style laydown threading inserts. The TiAlN coating supports dry or near-dry cutting at elevated speeds and extends tool life compared to uncoated carbide in demanding materials.

Key Features

• Solid carbide substrate provides rigidity and wear resistance for precision threading
• TiAlN coating via PVD process improves heat resistance and extends tool life
• Left-hand external UNJ thread form with controlled root radius for fatigue-resistant threads
• 32 TPI cutting geometry for consistent, repeatable thread profiles
• 3/8 inch inscribed circle (0.3750 inches) fits standard 16 EL compatible toolholders
• Laydown seating style for stable insert positioning under cutting loads

Compatibility

Designed for use in toolholders accepting 16 EL style laydown threading inserts. Verify toolholder specifications for insert seating geometry and clamping compatibility before installation.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer guidelines for clamping torque and insert seating. Ensure the machine spindle is fully stopped and locked out before changing inserts. Inspect the insert pocket and clamping screw for wear or debris before seating the new insert. Handle solid carbide inserts carefully to avoid chipping the cutting edge prior to use.