Sandvik Coromant 5857568 Threading Insert 10 Tpi Un

Product Description

The SANDVIK COROMANT 5857568 is a solid carbide laydown threading insert designed for external UN thread cutting operations. Part of the CoroThread 266 series, it features a TiCrAlN/TiN PVD coating that improves wear resistance and tool life in ferrous and abrasive materials. The insert produces a 60-degree included angle thread profile at 10 threads per inch, making it a direct match for standard UN external threading applications. It is right-hand oriented with a single tooth per side and an A-style chipbreaker. This insert is installed by machinists and toolroom technicians using compatible CoroThread 266 toolholders.

This insert is suited for external UN threading on CNC lathes and turning centers in both production and job-shop environments. The 266 insert style and size code 16 designate its seating geometry and clamping interface. With a 3/8-inch inscribed circle and 5/32-inch thickness, it fits standard laydown threading insert pockets designed for the CoroThread 266 platform. Typical applications include threading of steel, alloy steel, and similar machinable metals where a consistent 60-degree UN profile is required.

Key Features

• Solid carbide substrate with TiCrAlN/TiN PVD coating for extended wear resistance
• 10 TPI cutting edge for standard UN external thread profiles
• 60-degree included angle matches UN thread form geometry
• Right-hand orientation for conventional external threading passes
• A-style chipbreaker for controlled chip evacuation
• CoroThread 266 series insert style 16 seating geometry

Compatibility

Designed for use in CoroThread 266 series toolholders that accept size code 16 laydown threading inserts with a 3/8-inch inscribed circle. The manufacturers catalog number for this insert is 266RG-16UN01A100M 1135.

Installation Notes

Installation is performed by machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the toolholder is clear of the workpiece before swapping inserts. Seat the insert firmly into the pocket and torque the clamping screw per the toolholder manufacturer specification. Verify insert orientation and thread hand before resuming cutting operations.