Sandvik Coromant 5757893 Threading Insert 12 Tpi Un

Product Description

The SANDVIK COROMANT 5757893 is a solid carbide laydown threading insert engineered for precision internal UN thread cutting. Designated under the CoroThread 266 series, this insert carries a dual PVD coating of TiAlN and TiCrAlN for extended wear resistance in demanding threading applications. It is configured for left-hand internal threading at 12 threads per inch (TPI) with a 60-degree included angle. The inscribed circle measures 3/8 inches and the insert thickness is 5/32 inches. Manufacturer grade 1125 provides a balanced combination of toughness and heat resistance. Licensed machinists and CNC threading specialists are the primary users of this tooling component.

This insert is suited for internal threading operations on turning centers and CNC lathes where UN-standard left-hand threads are required. The chipbreaker designation A and single tooth per side geometry make it appropriate for controlled, consistent thread profile production in ferrous and non-ferrous materials. It fits toolholders designed for the CoroThread 266 insert style 266 with insert size code 16, making it a direct fit in compatible SANDVIK COROMANT CoroThread 266 toolholder systems.

Key Features

• Solid carbide substrate with PVD-applied TiAlN and TiCrAlN dual-layer coating for thermal and wear resistance
• Left-hand internal UN thread configuration at 12 TPI with 60-degree included angle
• CoroThread 266 series insert style with size code 16
• Chipbreaker style A for controlled chip formation during threading passes
• Inscribed circle of 3/8 inches (9.53 mm); insert thickness of 5/32 inches (3.97 mm)
• Hole diameter of 0.1732 inches (4.40 mm) for secure toolholder seating

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting insert style 266, size code 16, for left-hand internal UN threading applications. Manufacturer catalog number reference: 266LL-16UN01A120M 1125.

Installation Notes

Installation should be performed by qualified machinists following the toolholder manufacturer torque and clamping specifications for the CoroThread 266 insert pocket. Power down and lock out the machine spindle before seating or removing the insert. Inspect the insert pocket and clamping screw for wear or damage prior to installation. Dispose of worn inserts in accordance with applicable shop safety and carbide recycling procedures.