Sandvik Coromant 5781887 Threading Insert 8 Tpi Npt

Product Description

The SANDVIK COROMANT 5781887 is a laydown threading insert engineered for external NPT thread cutting at 8 threads per inch. Part of the CoroThread 266 series, this insert is manufactured from solid carbide and coated with a TiCrAlN/TiAlN PVD finish for extended cutting life and heat resistance at the edge. The insert features a 60-degree included angle appropriate for standard NPT thread form, a right-hand cutting direction, and a single tooth per side geometry. With a 3/8-inch inscribed circle and 5/32-inch thickness, it seats into compatible 266-series toolholders used in turning and threading operations on CNC lathes and manual turning centers.

This insert is suited for threading operations producing NPT external pipe threads on turned components across manufacturing, maintenance, and industrial production environments. The 1125 grade with PVD coating is well-matched for threading steel, alloy steel, and similar materials where edge toughness and wear resistance are priorities. It is typically installed by machinists and tool-and-die professionals performing single-point threading passes on pipe fittings, couplings, and threaded connectors.

Key Features

• Solid carbide substrate with dual-layer TiCrAlN/TiAlN PVD coating for wear resistance and thermal stability
• Right-hand external NPT thread form at 8 TPI with 60-degree included angle
• CoroThread 266 series insert style for use with compatible indexable threading toolholders
• 3/8-inch (9.53 mm) inscribed circle and 5/32-inch (3.97 mm) thickness for precise, repeatable seating
• Chipbreaker style A for controlled chip formation during threading passes
• PVD coating process preserves sharp cutting edge geometry longer than CVD alternatives on fine thread profiles

Compatibility

Designed for use with Sandvik Coromant CoroThread 266 series indexable threading toolholders that accept the 266RG-16 insert style. Confirm toolholder pocket specification before installation.

Installation Notes

This insert is installed by qualified machinists following standard indexable insert replacement procedures. Power down and lock out the machine before changing inserts. Use the appropriate torx or hex key torque tool as specified by the toolholder manufacturer — do not exceed the recommended clamping torque. Inspect the toolholder pocket and clamping components for wear or debris before seating the new insert.