Hertel 16ERZ18NPTHG225 Threading Insert 18 Tpi Npt Carbide

Product Description

The HERTEL 16ERZ18NPTHG225 is a laydown-style threading insert designed for cutting external NPT (National Pipe Taper) threads on CNC lathes and threading machines. Manufactured from solid carbide with a PVD-applied TiAlN coating, this insert delivers thermal resistance and edge hardness suited to interrupted cuts and abrasive materials. It runs at 18 threads per inch (TPI) with a 3/8-inch inscribed circle and a thickness of 0.1614 inches (4.10 mm). The HG225TR grade is engineered for consistent thread form accuracy in production environments, making it a standard choice for machinists and tool-room professionals working to NPT pipe thread specifications.

This insert is used in external NPT threading applications on materials including steel, stainless, and cast iron where a tapered pipe thread form is required. Right-hand orientation suits standard lathe rotation for conventional threading passes. Typical install scenarios include production threading of pipe fittings, hydraulic adapters, and fluid-system components where NPT thread form integrity is critical to sealing performance. The 16ER insert style is a common laydown geometry compatible with industry-standard 16ER toolholders used in both manual and CNC turning setups.

Key Features

• Solid carbide substrate with PVD TiAlN coating for heat and wear resistance
• 18 TPI for standard NPT pipe thread pitches
• 3/8-inch inscribed circle, 16ER laydown style insert geometry
• Right-hand cut for external threading on standard CNC and manual lathes
• HG225TR manufacturer grade suited to production threading in ferrous and alloy materials
• Thickness of 0.1614 inches (4.10 mm) for precise seating in compatible toolholders

Compatibility

Designed for use with 16ER-style laydown threading toolholders. Compatible with external NPT thread forms at 18 TPI. Catalog reference number 16ER Z 18 NPT per manufacturer documentation.

Installation Notes

Installation is performed by qualified machinists or tool-room technicians. Ensure the lathe or CNC turning center is fully stopped and de-energized before indexing or replacing inserts. Seat the insert fully in the toolholder pocket and torque the clamping screw to the toolholder manufacturer specification. Verify thread form with a calibrated NPT thread gauge after the first pass before committing to a full production run.