Sandvik Coromant 5857542 Threading Insert 8-16 Tpi

Product Description

The SANDVIK COROMANT 5857542 is a laydown threading insert engineered for precision internal thread cutting on lathes and turning centers. Part of the CoroThread 266 series, this solid carbide insert features a TiCrAlN/TiN PVD coating that extends tool life in demanding threading operations. It is configured for left-hand internal 60-degree V threads across a range of 8 to 16 TPI (1.50 to 3.00 mm pitch). The 3/8-inch inscribed circle and 5/32-inch thickness conform to standard insert geometry. Machinists and CNC operators working in job shops, production turning, or maintenance machining will find this insert suited to threading bores in steel and alloy components.

This insert is applied in internal threading operations where a left-hand thread orientation is required. The 60-degree V thread standard covers a broad range of common unified and metric thread profiles. It is intended for use in CoroThread 266 compatible toolholders and is appropriate for threading operations in both production and repair machining environments. The A chipbreaker geometry supports chip control across the supported pitch range.

Key Features

• Solid carbide substrate with TiCrAlN/TiN PVD coating for extended wear resistance
• Left-hand internal 60-degree V thread configuration, 8-16 TPI (1.50-3.00 mm pitch)
• CoroThread 266 series insert style with A chipbreaker geometry
• Inscribed circle: 3/8 inch (9.53 mm); thickness: 5/32 inch (3.97 mm)
• Corner radius: 0.0035 inch (0.09 mm) for accurate thread form
• Hole diameter: 0.1732 inch (4.40 mm) for standard clamping screw fitment

Compatibility

Designed for use in CoroThread 266 series compatible internal threading toolholders accepting a 16-size laydown insert. Catalog reference number 266LL-16VM01A002M 1135.

Installation Notes

Installation and replacement of threading inserts should be performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before changing inserts. Use the correct torque wrench and clamping screw specified for the CoroThread 266 toolholder to seat the insert properly. Inspect the insert pocket and clamping components for wear or damage before installing a new insert.