Sandvik Coromant 5757915 Threading Insert 8-16 Tpi

Product Description

The SANDVIK COROMANT 5757915 is a solid carbide laydown threading insert designed for external 60-degree V-thread cutting operations. It carries manufacturer grade 1125 with a PVD-applied TiAlN and TiCrAlN dual-layer coating that supports high cutting speeds and extended tool life. The insert covers a thread range of 8 to 16 TPI (1.50 to 3.00 mm pitch), features a 3/8 inch (9.53 mm) inscribed circle, and is 5/32 inch (3.97 mm) thick. It belongs to the CoroThread 266 series and is installed by machinists and CNC tooling technicians in production threading applications on lathes and turning centers.

This insert is suited for external threading on turned components in job shop and production environments. The right-hand cutting geometry and single-tooth profile make it appropriate for generating 60-degree V-form threads on ferrous and non-ferrous workpieces. The A chipbreaker designation is optimized for controlled chip evacuation during threading passes. Applications include threading on steel, stainless, and similar materials where a consistent, repeatable thread form is required across medium-to-high volume runs.

Key Features

• Solid carbide substrate with PVD TiAlN and TiCrAlN dual-layer coating for heat and wear resistance
• Covers 8-16 TPI (1.50-3.00 mm pitch) external 60-degree V-thread range in a single insert
• Right-hand cutting orientation for standard external threading operations
• CoroThread 266 series insert style with A chipbreaker for reliable chip control
• 0.20 mm (0.0079 inch) corner radius for precise thread root geometry
• Mounting hole diameter of 4.40 mm (0.1732 inch) for positive insert clamping

Compatibility

Designed as an OEM-style replacement insert for SANDVIK COROMANT CoroThread 266 series toolholders accepting 16-size laydown threading inserts with the 266RG insert style designation.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or removing the insert. Use the manufacturer-specified torx or clamping screw driver to secure the insert at the correct clamping torque per the toolholder documentation. Inspect the insert pocket and clamping screw for wear or debris before installing a new insert to ensure proper seating and thread form accuracy.