Seco 00077859 Threading Insert 18 Tpi Npt Solid Carbide

Product Description

The SECO 00077859 is a laydown threading insert designed for internal NPT thread cutting at 18 threads per inch. Built from solid carbide micrograin substrate in the CP500 grade, it carries a PVD-applied TiAlN/TiN coating for extended tool life across a wide range of workpiece materials. The 11NR insert style features a 60-degree included angle, a 1/4-inch inscribed circle, and a thickness of 0.1181 inches. Right-hand cutting geometry makes it suitable for standard internal threading operations on pipe fittings and threaded bores requiring NPT form compliance. Licensed machinists and CNC operators use this insert in lathe and turning-center applications.

This insert is intended for internal NPT threading on universal workpiece materials including cast iron, steel, non-ferrous metals, heat-resistant alloys, and stainless steel, as indicated by the material grade codes K, M, N, P, and S. It is part of the SECO Snap Tap series and is suited to both production turning environments and job-shop threading work where consistent thread form and insert repeatability are required. The NPT standard profile is commonly applied in pipe and fitting manufacture, fluid system components, and pressure-rated threaded connections.

Key Features

• Solid carbide micrograin substrate in CP500 grade for wear resistance and edge stability
• PVD-applied TiAlN/TiN coating for reduced heat buildup and extended insert life
• 60-degree included angle cut to NPT thread form standard
• Right-hand internal cutting geometry for standard NPT bore threading
• ISO-compliant 11NR insert style for compatibility with standard Snap Tap toolholders
• Universal material grade rating covers ferrous, non-ferrous, and high-temp alloy workpieces

Compatibility

Designed for use in SECO Snap Tap series toolholders accepting the 11NR insert style. Suitable for internal NPT threading at 18 TPI across workpiece material codes K, M, N, P, and S as specified by the manufacturer.

Installation Notes

Installation is performed by machinists or CNC operators on lathes or turning centers equipped with appropriate Snap Tap toolholders. Power down and lock out the machine before seating or replacing any insert. Ensure the insert pocket and clamping surfaces are clean and free of chips before seating the insert. Do not exceed the toolholder manufacturer's recommended clamping torque specifications for the 11NR insert style.