Sandvik Coromant 5757945 Threading Insert 12 Tpi Un

Product Description

The SANDVIK COROMANT 5757945 is a laydown threading insert from the CoroThread 266 series, designed for cutting external UN threads on CNC lathes and turning centers. It is manufactured from solid carbide with a PVD-applied TiAlN and TiCrAlN dual coating that resists heat and wear during continuous threading passes. The insert is right-hand oriented, cuts at 12 threads per inch, and carries a 60-degree included angle standard for unified thread profiles. With a 3/8-inch inscribed circle and a thickness of 0.1563 inches, it seats in CoroThread 266-compatible toolholders. This insert is used by machinists and CNC tooling professionals in production threading operations.

This insert is suited for external UN thread turning on ferrous and non-ferrous workpieces in both light production and high-volume shop environments. The 266 series laydown style positions the insert at a low cutting angle, reducing vibration and improving surface finish on threaded features. Two teeth per side and the A chipbreaker geometry support controlled chip evacuation during threading cycles. Typical applications include threading on shafts, fasteners, fittings, and hydraulic components where UN thread accuracy is required.

Key Features

• Solid carbide substrate for rigidity and wear resistance in threading applications
• PVD TiAlN and TiCrAlN dual coating for extended tool life at elevated cutting temperatures
• Right-hand external UN thread configuration at 12 TPI with 60-degree included angle
• A chipbreaker geometry promotes controlled chip flow and reduces recutting
• Two teeth per side maximize insert utilization and reduce per-part tooling cost
• CoroThread 266 series compatibility for use with matching Sandvik Coromant toolholders

Compatibility

Designed for use with CoroThread 266 series toolholders accepting the 266 insert style with a 16 insert size code. Consult the Sandvik Coromant toolholder catalog to confirm seat and clamping compatibility before installation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and locked out before seating or indexing the insert. Use the correct torque wrench and Sandvik Coromant clamping hardware specified for the CoroThread 266 toolholder to avoid seat damage. Inspect the insert pocket and clamping screw for wear or debris before fitting a new insert.