Sandvik Coromant 5781866 Threading Insert Metric 60 Solid Carbide

Product Description

The SANDVIK COROMANT 5781866 is a laydown threading insert designed for right-hand external threading operations on Metric 60-degree thread forms. Built from solid carbide with a PVD-applied TiCrAlN/TiN finish, this insert delivers wear resistance and edge stability in demanding threading applications. It carries a 1.50 mm pitch, a 3/8-inch (9.53 mm) inscribed circle, and a thickness of 5/32 inch (3.97 mm). Part of the CoroThread 266 series, it is engineered for use in CNC turning centers and threading toolholders that accept the 266 insert style. Installation and operation are performed by machining professionals working to close thread tolerances.

This insert is suited for external metric thread cutting in precision machining environments, including job shops and production turning cells. The chipbreaker designation A and the 60-degree included angle make it appropriate for standard Metric 60-degree thread profiles at a 1.50 mm pitch. It is a single-tooth insert intended for use where consistent thread form and surface finish are required across production runs. Compatible toolholders and boring bars designed for the CoroThread 266 platform are the standard pairing for this insert geometry.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiN coating for extended tool life in external threading
• Right-hand, external Metric 60-degree thread form with 1.50 mm pitch
• CoroThread 266 series insert style with chipbreaker designation A
• 3/8-inch (9.53 mm) inscribed circle; 5/32-inch (3.97 mm) thickness
• Hole diameter of 0.1732 inch (4.40 mm) for secure clamping in compatible toolholders
• Single tooth per side for controlled thread engagement

Compatibility

Designed for use with CoroThread 266 series toolholders and clamping systems that accept the 266 insert style and 16 insert size code. The manufacturers catalog number for this insert is 266RG-16MM01A150M 1135.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or replacing the insert. Use the correct torque wrench and clamping screw specified by the toolholder manufacturer to avoid insert movement during operation. Inspect the insert pocket and clamping components for wear or debris before installing a new insert.