Sandvik Coromant 5781916 Threading Insert 11 Tpi Solid Carbide

Product Description

The SANDVIK COROMANT 5781916 is a solid carbide laydown threading insert designed for external UN thread cutting on CNC lathes and turning centers. Part of the CoroThread 266 series, this insert features a PVD-applied dual-layer TiAlN and TiCrAlN coating for elevated wear resistance and edge retention at high cutting temperatures. It carries a 60-degree included angle, cuts right-hand threads at 11 threads per inch (TPI), and is sized with a 3/8-inch inscribed circle (IC) and a thickness of 0.1563 inches. Licensed machinists and CNC operators install this insert in compatible CoroThread 266 toolholders for precision external threading operations.

This insert is suited for external UN threading applications in production and job-shop environments on materials where PVD-coated carbide performs reliably. The CoroThread 266 insert style with chipbreaker designation A is applied in single-point threading passes on lathes and turn-mill centers. With a single tooth per side and right-hand orientation, it is configured for standard right-hand external UN thread forms on workpieces requiring precise thread geometry and consistent pitch control at 11 TPI.

Key Features

• Solid carbide substrate with PVD-applied TiAlN and TiCrAlN dual-layer coating for extended tool life
• Right-hand external UN thread form at 11 TPI with 60-degree included angle
• 3/8-inch inscribed circle (9.53 mm) and 0.1563-inch thickness (3.97 mm) for precise toolholder seating
• Chipbreaker style A for controlled chip formation during threading passes
• CoroThread 266 series geometry engineered for single-point external threading on turning equipment
• Manufacturer grade 1125 matched to the PVD coating process for thermal stability

Compatibility

Designed as an OEM-style replacement insert for SANDVIK COROMANT CoroThread 266 series toolholders accepting insert size code 16 laydown threading inserts with a 0.1732-inch hole diameter.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully and evenly in the toolholder pocket and verify clamp torque per the toolholder manufacturer specifications before resuming cuts. Inspect the insert pocket and clamping screw for wear or contamination before each insert change.