Sandvik Coromant 5857612 Threading Insert 10 Tpi Un

Product Description

The SANDVIK COROMANT 5857612 is a laydown threading insert designed for cutting internal UN threads in machining applications. Built from solid carbide with a PVD-applied TiCrAlN/TiN coating, this insert delivers wear resistance and thermal stability during threading operations. It is configured for right-hand internal threading at 10 threads per inch (TPI) with a 60-degree included angle. The 3/8-inch inscribed circle and 5/32-inch thickness place it in the CoroThread 266 series, making it a purpose-built insert for precision thread forms on CNC lathes and turning centers operated by machinists and tool-and-die professionals.

This insert is suited for internal UN thread applications in production and job-shop environments. It is used on CNC turning centers and lathes where consistent thread form and dimensional accuracy are required. The single-tooth-per-side geometry and chipbreaker style A are optimized for controlled chip evacuation during internal threading passes. Typical applications include threading bores in ferrous and non-ferrous workpieces where UN thread standards apply.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiN coating for extended tool life
• Right-hand internal UN thread configuration at 10 TPI
• 60-degree included angle for standard UN thread form
• Chipbreaker style A for controlled chip flow in internal threading
• CoroThread 266 series insert with style code 266RL-16UN01A100M
• 3/8-inch (9.53 mm) inscribed circle with 4.40 mm mounting hole diameter

Compatibility

Designed for use in CoroThread 266 series toolholders that accept laydown threading inserts with a 16-size insert code and 3/8-inch inscribed circle, as specified by the manufacturer for internal UN threading applications.

Installation Notes

This insert is installed by a qualified machinist or toolroom technician following the toolholder manufacturer's torque and clamping specifications. Ensure the machine spindle is fully stopped and the tool turret is locked before changing inserts. Verify insert seating and clamping integrity before initiating a threading cycle. Handle solid carbide inserts with care to avoid chipping cutting edges during installation or storage.