Sandvik Coromant 5757995 Threading Insert 16 Tpi Unj

Product Description

The SANDVIK COROMANT 5757995 is a solid carbide laydown threading insert from the CoroThread 266 series, designed for external UNJ thread turning applications. Carrying manufacturer grade 1125 and a dual-layer PVD coating of TiCrAlN and TiAlN, this insert delivers wear resistance and heat management suited to precision threading operations. It cuts right-hand external threads at 16 threads per inch with a 60-degree included angle and a single tooth per side geometry. The 3/8-inch inscribed circle and 5/32-inch thickness conform to standard insert size code 16 dimensions, making it a direct fit for compatible CoroThread 266 toolholders. Licensed machinists and CNC turning specialists typically install this insert in production and job-shop environments.

This insert is intended for external UNJ thread profiles, a thread standard commonly specified in aerospace and high-integrity fastener applications where root radius control is critical. The 16 TPI pitch suits medium-to-coarse thread applications on ferrous and non-ferrous workpieces. The A chipbreaker geometry supports controlled chip evacuation during threading passes. It is sold individually but carries a minimum order quantity of 10 units, which is standard for indexable carbide inserts at this size and grade.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN and TiAlN dual-layer coating for extended tool life
• 16 TPI right-hand external UNJ thread form with 60-degree included angle
• Insert size code 16 with 3/8-inch inscribed circle and 5/32-inch thickness
• A chipbreaker geometry for controlled chip flow during threading cycles
• Part of the CoroThread 266 series, compatible with 266-series toolholders
• Manufacturer grade 1125 suited to precision threading in demanding materials

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting insert style 266, size code 16. Manufacturer catalog number 266RG-16NJ01A160E 1125 identifies this insert within the CoroThread 266 system.

Installation Notes

Insert seating and clamping should be performed with the machine in a locked-out, zero-energy state before indexing or replacing inserts. Use the correct torx or clamping key specified for the CoroThread 266 toolholder to achieve proper seating torque without cracking the carbide substrate. Inspect the insert pocket and clamping screw for debris or wear before each insert change. Handle solid carbide inserts carefully to avoid chipping cutting edges prior to use.