Sandvik Coromant 5757971 Threading Insert 14 Tpi Npt

Product Description

The SANDVIK COROMANT 5757971 is a solid carbide laydown threading insert engineered for right-hand internal NPT thread cutting at 14 threads per inch. Part of the CoroThread 266 series, it carries a dual PVD coating of TiAlN and TiCrAlN for heat resistance and extended cutting life. The insert measures 3/8 inches inscribed circle and 5/32 inches thick, fitting the 266RL16NT01A140M 1125 designation with an A-style chipbreaker and a 60-degree included angle. Machinists and CNC operators working in production threading applications will find this insert suited to demanding internal pipe thread profiles.

This insert is applied in internal NPT threading operations on lathes and CNC turning centers. It is used in machining environments where pipe fitting threads must meet NPT standard profiles in materials such as steel and alloys. The 14 TPI designation targets standard NPT pipe thread sizes, making it a common choice for shops producing hydraulic fittings, fluid line components, and instrumentation ports. It is sold in minimum order quantities of 10, consistent with production-volume tooling programs.

Key Features

• Solid carbide substrate with PVD-applied TiAlN and TiCrAlN dual coating for thermal stability and wear resistance
• Right-hand internal NPT thread form at 14 TPI with 60-degree included angle
• 3/8 inch (9.53 mm) inscribed circle and 5/32 inch (3.97 mm) thickness for 266-style toolholders
• A-style chipbreaker for controlled chip formation in internal threading
• CoroThread 266 series insert with manufacturer grade 1125
• Hole diameter of 0.1732 inches (4.40 mm) for secure clamping in compatible toolholders

Compatibility

Designed as a replacement-style insert for SANDVIK COROMANT CoroThread 266 series toolholders accepting size 16 laydown threading inserts with the 266RL designation.

Installation Notes

This insert is installed and replaced by a qualified machinist or CNC tooling technician. The machine spindle must be brought to a full stop and the toolholder must be secured before seating or removing the insert. Use the appropriate torx or clamping screw specified for the 266 toolholder to achieve proper clamping force without overtightening the insert seat. Inspect the insert pocket and clamping components for wear or debris before each insert change.