Sandvik Coromant 5781913 Threading Insert 8 Tpi Un Carbide

Product Description

The SANDVIK COROMANT 5781913 is a solid carbide laydown threading insert from the CoroThread 266 series, designed for external UN thread cutting at 8 threads per inch (TPI). It features a TiCrAlN/TiN PVD coating that provides wear resistance and thermal stability during threading operations. The insert has a 3/8 inch (9.53 mm) inscribed circle and measures 5/32 inch (3.97 mm) thick. With a 60-degree included angle and a single tooth per side, this right-hand insert is suited for precision external thread profiling on CNC lathes and turning centers. It is intended for use by machinists and toolroom professionals working with UN-standard threaded components.

This insert is used in external threading operations requiring UN thread form at 8 TPI. It fits into CoroThread 266 series toolholders designed for laydown-style inserts. Typical applications include threading on ferrous and non-ferrous workpieces in production and job shop environments. The A chipbreaker geometry supports controlled chip evacuation during threading passes. This insert is appropriate for both moderate and finish threading cuts on turning equipment where consistent thread form and surface finish are required.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN/TiN coating for extended tool life
• 8 TPI UN external thread form with 60-degree included angle
• Right-hand cutting orientation for standard external threading applications
• A chipbreaker for controlled chip management during threading passes
• CoroThread 266 series insert style compatible with 266-series toolholders
• 3/8 inch inscribed circle with 0.1732 inch hole diameter for secure clamping

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders that accept size 16 laydown threading inserts with a 3/8 inch inscribed circle and 0.1732 inch hole diameter.

Installation Notes

Threading inserts should be installed by qualified machinists following the toolholder manufacturer's clamping torque specifications. Power down and lock out the machine spindle before changing inserts. Inspect the toolholder pocket and clamping screw for wear or debris before seating the insert. Handle carbide inserts carefully to avoid chipping the cutting edge prior to use.