Hertel 16ER20UNJHG225T Threading Insert 20 Tpi Solid Carbide

Product Description

The HERTEL 16ER20UNJHG225T is a solid carbide laydown threading insert designed for external UNJ thread forms at 20 threads per inch. Built to the 16 ER insert style, it features a TiAlN coating applied via PVD process, which improves wear resistance and tool life in demanding threading operations. The insert has a 3/8 inch inscribed circle and a thickness of 0.146 inches. It is used by machinists and CNC operators working on aerospace, defense, and precision mechanical components where UNJ thread profiles are required. Right-hand cutting geometry supports standard external threading passes on turning centers and lathes.

This insert is suited for external threading operations on materials where a controlled thread root radius is required, as specified by the UNJ thread standard. That standard is common in aerospace and high-integrity fastener applications where fatigue resistance is critical. The 16 ER style fits standard laydown threading toolholders with matching ER-type pockets. The TiAlN PVD coating provides thermal stability during high-speed passes, making this insert appropriate for threading stainless steels, alloy steels, and similar materials. It is sold individually with a minimum order quantity of 10 pieces.

Key Features

• Solid carbide substrate for rigidity and dimensional consistency in threading operations
• TiAlN coating via PVD process for improved wear resistance and thermal performance
• 20 TPI cutting geometry for UNJ external thread forms
• Right-hand insert orientation for standard external threading direction
• 3/8 inch inscribed circle fits standard 16 ER-style laydown toolholders
• 0.146 inch insert thickness for secure seating in matched pockets

Compatibility

Designed for use in 16 ER-style laydown threading toolholders accepting a 3/8 inch inscribed circle insert with UNJ external thread geometry.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine before seating or removing inserts. Use the appropriate torx or hex key to the toolholder manufacturer's specified procedure when securing the insert clamp or screw. Verify insert seating and toolholder pocket condition before resuming cutting operations.