Hertel 16EL12UNJHG225T Threading Insert 12 Tpi Solid Carbide

Product Description

The HERTEL 16EL12UNJHG225T is a laydown threading insert designed for left-hand external UNJ thread cutting applications. Manufactured from solid carbide and finished with a PVD-applied TiAlN coating, this insert delivers heat resistance and edge wear performance in demanding threading operations. It carries a 3/8 inch inscribed circle (IC) and measures 0.146 inches thick. At 12 threads per inch (TPI), it is suited for precision UNJ-standard thread profiles commonly required in aerospace and high-strength fastener applications. Machining professionals and CNC operators specify this insert for its dimensional consistency and coating durability across production runs.

This insert is intended for use in CNC lathes and turning centers equipped with compatible 16 EL-style laydown toolholders. Left-hand configuration makes it appropriate for threading operations where the spindle direction or workpiece orientation requires a mirrored cutting approach. The UNJ thread standard, with its controlled root radius, is typically specified for aerospace, defense, and precision mechanical assemblies where fatigue resistance is critical. The HERTEL HG225TR grade is formulated for threading in steels and other ferrous materials under moderate to high cutting speeds.

Key Features

• Solid carbide construction for rigidity and edge retention in threading operations
• TiAlN coating applied via PVD process for elevated heat resistance and extended tool life
• Left-hand external thread orientation for mirrored or reverse-direction threading setups
• UNJ thread standard with controlled root radius suited for fatigue-critical assemblies
• 12 TPI cutting geometry for consistent thread profile accuracy
• 3/8 inch inscribed circle for use in standard 16 EL-style laydown toolholders

Compatibility

Designed for use in 16 EL-style laydown threading toolholders. Confirm toolholder pocket geometry and insert seating style before installation. No additional model-specific compatibility data was provided in the product input.

Installation Notes

Insert installation should be performed by a qualified machinist or CNC tooling technician with the machine in a full stopped and locked-out state. Use the appropriate torx or hex key at the manufacturer-recommended seating method to secure the insert without over-torquing the clamping screw. Inspect the insert pocket for debris or damage before seating, as contamination can affect thread profile accuracy. Verify thread direction and insert hand orientation against the programmed toolpath before commencing any cutting operation.