Hertel 16IR12UNHG225TR Threading Insert 12 Tpi Solid Carbide

Product Description

The HERTEL 16IR12UNHG225TR is a laydown-style threading insert designed for internal thread-cutting operations on CNC lathes and turning centers. Manufactured from solid carbide with a PVD-applied TiAlN coating, this insert is built for right-hand internal threading to the UN thread standard at 12 threads per inch (TPI). The 3/8-inch (0.3750-inch) inscribed circle and 0.146-inch thickness conform to the 16IR insert geometry, making it a direct fit for compatible 16IR toolholders. The TiAlN coating provides thermal resistance and extended tool life in ferrous and hardened materials. Installation is performed by qualified machinists using standard insert-change tooling.

This insert is suited for internal threading on ferrous metals, alloy steels, and similar machinable materials in precision machining environments. It is appropriate for production threading operations where consistent thread form and dimensional accuracy are required. The 12 TPI UN thread profile targets common unified national thread fastener and fitting applications found in general manufacturing, hydraulic, and mechanical assembly work. Each package contains one insert, with a minimum order quantity of 10 pieces.

Key Features

• Solid carbide substrate for rigidity and wear resistance in threading operations
• TiAlN PVD coating for thermal stability and extended tool life
• Right-hand internal UN thread form at 12 TPI
• 16IR insert style with 3/8-inch (0.3750-inch) inscribed circle
• 0.146-inch insert thickness conforming to standard 16IR geometry
• Manufacturer grade HG225TR for consistent performance in production threading

Compatibility

Designed for use in 16IR-style internal threading toolholders compatible with the UN thread standard at 12 TPI.

Installation Notes

This insert is installed and changed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is stopped and all motion is locked out before changing inserts. Use the correct insert-seating torx or hex key as specified by the toolholder manufacturer to achieve proper clamping force without overtightening. Verify thread form and pitch with a thread gauge after the first pass when setting up a new insert.