Sandvik Coromant 5781873 Laydown Threading Insert

Product Description

The SANDVIK COROMANT 5781873 is a laydown threading insert designed for right-hand external Metric 60-degree thread cutting on CNC and manual lathes. Manufactured from solid carbide with a PVD-applied TiCrAlN and TiAlN dual-layer coating, this insert delivers wear resistance and thermal stability during continuous threading passes. It carries a 1.50 mm pitch and fits the CoroThread 266 series toolholding system. The inscribed circle measures 3/8 inches (9.53 mm), and insert thickness is 5/32 inches (3.97 mm). Catalog designation is 266RG-16MM01C150M in grade 1125. Machinists and CNC operators install this insert in production and job-shop environments where repeatable thread form accuracy is critical.

This insert is suited for external Metric 60-degree threading operations on ferrous and non-ferrous workpieces in both production and precision machining environments. The C chipbreaker geometry supports controlled chip evacuation during threading, making it appropriate for close-tolerance work on lathes where chip interference can affect thread quality. It is packaged individually and sold with a minimum order quantity of 10 units, consistent with tooling-room replenishment purchasing.

Key Features

• Solid carbide substrate with PVD TiCrAlN and TiAlN dual-layer coating for extended tool life
• Right-hand external Metric 60-degree thread form at 1.50 mm pitch
• CoroThread 266 series insert style code 266RG, size code 16
• C chipbreaker geometry for controlled chip flow during threading passes
• Inscribed circle of 3/8 inches (9.53 mm) with 0.1732-inch hole diameter
• Grade 1125 carbide with PVD coating process for thermal and abrasion resistance

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting 266RG-style laydown threading inserts with a 16 insert size code.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the lathe is locked out before changing inserts. Seat the insert fully into the toolholder pocket and torque the clamping screw to the toolholder manufacturer's specified value using the appropriate Torx or hex key. Verify insert seating and thread form with a thread gauge before returning the machine to production.