Hertel H08712598 Threading Insert 14 Tpi 3/8 in Npt

Product Description

The HERTEL H08712598 is a solid carbide laydown threading insert designed for cutting external NPT (National Pipe Taper) threads on a lathe or threading machine. This insert features a 16ER style profile with a 3/8 inch inscribed circle and a thickness of 0.146 inches. The TiC/TiN multilayer coating improves surface hardness and wear resistance, extending tool life in production threading applications. At 14 threads per inch, it is matched to standard NPT thread forms used across plumbing, pipe fitting, and fluid system fabrication. The right-hand cutting geometry suits the most common threading setups in a machining environment.

This insert is used in threading operations where a repeatable, accurate NPT thread profile is required on external pipe ends or fittings. Typical applications include production machining of pipe nipples, hydraulic fittings, and industrial fluid connectors in materials suited to carbide tooling. It is installed in a compatible 16ER insert holder and is appropriate for CNC lathes and manual engine lathes operated by machinists and toolroom technicians. The 0 degree relief angle indicates a laydown-style seat, which requires a holder designed for this insert geometry.

Key Features

• Solid carbide substrate for rigidity and wear resistance in threading cuts
• TiC/TiN coating for improved hardness and reduced tool wear
• 14 TPI NPT thread form for standard tapered pipe thread production
• 16ER insert style with 3/8 inch inscribed circle for precise holder fitment
• Right-hand external thread cutting geometry
• 0 degree relief angle — laydown seating requires a matching holder

Compatibility

Designed for use in 16ER-style threading insert holders configured for laydown inserts with a 0 degree relief angle and a 3/8 inch inscribed circle seat.

Installation Notes

Installation is performed by qualified machinists following standard insert indexing procedures. Power down and lock out the lathe spindle before seating or replacing the insert. Use the correct torque wrench and insert screw specified by the holder manufacturer — do not overtighten, as carbide inserts are brittle and can crack under excess clamping force. Verify holder and insert style compatibility before first use to ensure proper seating and thread form accuracy.