Sandvik Coromant 5757973 Threading Insert 11.5 Tpi Nptf

Product Description

The SANDVIK COROMANT 5757973 is a laydown threading insert designed for cutting external NPTF threads at 11.5 threads per inch (TPI). Part of the CoroThread 266 series, it is manufactured from solid carbide and carries a PVD-applied TiCrAlN/TiAlN dual-layer coating that supports wear resistance in demanding threading operations. The insert features a 60-degree included angle, a right-hand cutting orientation, and a single tooth per side. Machinists and CNC lathe operators working on pipe fitting and fluid-system components use this insert for consistent, precision NPTF thread profiles.

This insert is suited for external NPTF threading applications on lathes and turning centers. NPTF threads are a taper pipe thread standard used in fluid and gas system connections where a pressure-tight seal is required without additional sealant. The CoroThread 266 insert style is a laydown configuration, meaning the insert seats flat in a dedicated 266-series toolholder. This geometry is common in production environments where thread quality and repeatability are critical across high-volume runs on ferrous and non-ferrous workpieces.

Key Features

• Solid carbide substrate for rigidity and wear resistance in threading operations
• PVD-applied TiCrAlN/TiAlN coating for extended tool life
• Right-hand external NPTF thread profile at 11.5 TPI
• 60-degree included angle with chipbreaker style A
• 3/8 inch (9.53 mm) inscribed circle, 5/32 inch (3.97 mm) thickness
• Designed for use with CoroThread 266 series toolholders

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting insert style 266 with size code 16. Manufacturer catalog reference: 266RG-16NT01A115M 1125.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Before changing inserts, ensure the machine spindle is fully stopped and the machine is placed in a safe, locked-out state per shop safety procedures. Use the appropriate torx or hex key as specified by the toolholder manufacturer when seating the insert clamp screw. Do not exceed the clamping torque range indicated on the toolholder documentation, and inspect the insert pocket and seating surface for debris before securing the insert.