Sandvik Coromant 5781914 Threading Insert 9 Tpi Solid Carbide

Product Description

The SANDVIK COROMANT 5781914 is a solid carbide laydown threading insert designed for external UN thread cutting operations. Part of the CoroThread 266 series, it features a 60-degree included angle, right-hand cutting orientation, and a dual PVD coating of TiAlN and TiCrAlN for wear resistance at elevated cutting temperatures. With 9 threads per inch (TPI) and a 3/8-inch inscribed circle (9.53 mm), this insert is engineered for precision threading on CNC lathes and turning centers. It is installed by machinists and toolroom professionals working in general metalworking, aerospace, automotive, and fluid power applications.

This insert is suited for right-hand external UN threading on turned components where consistent thread form and tool life are critical. The A-style chipbreaker geometry promotes controlled chip evacuation during threading passes. The insert mounts in compatible CoroThread 266 holders using a 0.1732-inch (4.40 mm) hole diameter for positive clamping and repeatable indexing. It is appropriate for use on steels, alloys, and similar materials in both production and jobbing environments.

Key Features

• Solid carbide substrate with PVD-applied TiAlN and TiCrAlN dual coating for extended tool life
• Right-hand external UN thread form with 60-degree included angle and 9 TPI
• 3/8-inch (9.53 mm) inscribed circle; 0.1563-inch (3.97 mm) thickness
• A-style chipbreaker for controlled chip flow during threading cuts
• Manufacturer grade 1125 optimized for CoroThread 266 series tooling systems
• Single tooth per side insert design for precise thread profile control

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series threading holders accepting 16-size laydown inserts. Refer to the CoroThread 266 holder selection guide to confirm shank size and clamping system compatibility before installation.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool builder and toolholder manufacturer guidelines. Power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque wrench and clamping screw specified for the CoroThread 266 holder to secure the insert without over-tightening. Verify thread form and pitch with a thread gauge after the first pass before committing to full production runs.