Hertel 16ERZ8NPTHG225T Threading Insert 8 Tpi Npt Carbide

Product Description

The HERTEL 16ERZ8NPTHG225T is a solid carbide laydown threading insert designed for external NPT thread cutting at 8 threads per inch. Finished with a PVD-applied TiAlN coating, it delivers improved wear resistance and heat tolerance compared to uncoated carbide inserts. The insert features a 3/8 inch (0.3750 inch) inscribed circle and a thickness of 0.1614 inches (4.10 mm). It is manufactured to the 16ER insert style in HERTEL grade HG225TR. This insert is used in CNC lathes and manual turning centers by machinists and tool-and-die professionals performing threaded pipe fitting production and maintenance work.

This insert is suited for right-hand external NPT threading operations on pipe and pipe fitting stock. At 8 TPI, it produces the standard tapered thread profile required for pressure-rated pipe connections in plumbing, HVAC, and industrial piping applications. It is compatible with 16ER-style laydown threading toolholders. Solid carbide construction makes it appropriate for threading steel, stainless steel, cast iron, and similar materials at consistent chip loads.

Key Features

• Solid carbide substrate with PVD TiAlN coating for extended tool life in ferrous materials
• 8 threads per inch, right-hand external NPT thread standard
• 16ER insert style fits standard 16ER laydown threading toolholders
• 3/8 inch inscribed circle (0.3750 inch) for precise seating in compatible pockets
• 4.10 mm (0.1614 inch) thickness for rigid, chatter-resistant cutting
• HERTEL grade HG225TR optimized for general-purpose threading applications

Compatibility

Designed as a direct-fit replacement for 16ER-style laydown threading insert pockets requiring external NPT thread geometry at 8 TPI. Manufacturer catalog reference: 16ER Z 8 NPT.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's insert seating and clamping procedures. Ensure the machine spindle is fully stopped and the toolholder is secured in the turret before changing inserts. Use the correct torque driver or clamp screw specified by the toolholder manufacturer — do not overtighten, as carbide inserts are brittle and can fracture. Verify thread pitch and hand orientation against the workpiece drawing before beginning the threading pass.