Sandvik Coromant 5781875 Laydown Threading Insert

Product Description

The SANDVIK COROMANT 5781875 is a solid carbide laydown threading insert from the CoroThread 266 series, engineered for right-hand external Metric 60-degree thread cutting on CNC lathes and turning centers. The insert carries a PVD-applied TiCrAlN/TiAlN dual-layer coating, which provides thermal resistance and wear protection during high-speed threading operations. Key dimensions include a 3/8-inch (9.53 mm) inscribed circle and a thickness of 5/32 inch (3.97 mm). With a 2.00 mm pitch and a single tooth per side, this insert is suited for precision threading passes where consistent thread form and surface finish are required. Manufacturer grade 1125 with chipbreaker designation C completes the specification profile.

This insert is intended for use in external threading applications on metalworking lathes and multi-axis turning centers in production and job-shop environments. It is most commonly used by machinists and CNC operators producing Metric 60-degree external threads at a 2.00 mm pitch. The CoroThread 266 series platform is designed for use with compatible 266-style toolholders that accept 16-size inserts. It suits both high-volume production runs and precision single-piece work where thread quality is critical.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiAlN coating for extended tool life in threading operations
• Right-hand external Metric 60-degree thread form at 2.00 mm pitch
• Inscribed circle: 3/8 inch (9.53 mm); thickness: 5/32 inch (3.97 mm)
• Chipbreaker C geometry for controlled chip formation during threading
• Single tooth per side for precise thread profile control
• Hole diameter of 0.1732 inch (4.40 mm) for secure toolholder seating

Compatibility

Designed for use with CoroThread 266 series toolholders accepting 16-size laydown threading inserts. Manufacturer catalog reference: 266RG-16MM01C200M 1125.

Installation Notes

Installation and indexing should be performed by a qualified machinist or CNC tooling technician with the machine in a full stop and lockout/tagout procedure applied before changing inserts. Use the appropriate Torx or hex key to seat the insert firmly in the toolholder pocket without overtightening the clamping screw. Verify insert orientation for right-hand cutting direction before resuming machine operation. Confirm thread pitch and form with a thread gauge on the first part before committing to a production run.