Sandvik Coromant 5857576 Threading Insert 12 Tpi Un

Product Description

The SANDVIK COROMANT 5857576 is a solid carbide laydown threading insert designed for external UN thread cutting at 12 threads per inch (TPI). Part of the CoroThread 266 series, this insert features a TiCrAlN/TiN PVD coating for wear resistance and thermal stability during threading operations. It carries a 60-degree included angle suited to unified thread profiles, with a 3/8-inch (9.53 mm) inscribed circle and a thickness of 5/32 inch (3.97 mm). Licensed machinists and CNC operators use this insert in indexable threading toolholders for external thread production on lathes and turning centers.

This insert is configured for right-hand external threading and is matched to the CoroThread 266 toolholder system. It uses the 266 insert style with a size code of 16 and an F chipbreaker geometry. The manufacturer grade 1135 with PVD-applied TiCrAlN/TiN coating makes it appropriate for threading steel and similar materials where controlled chip formation and surface finish are priorities. Typical applications include production threading of fittings, fasteners, and threaded mechanical components in job shop and production turning environments.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiN coating for extended tool life
• Right-hand external UN thread profile at 12 TPI with 60-degree included angle
• F chipbreaker geometry for controlled chip evacuation during threading
• 3/8-inch inscribed circle and 5/32-inch thickness for CoroThread 266 toolholder fitment
• Single tooth per side design for precise thread form engagement
• Manufacturer grade 1135 matched to PVD coating process for steel threading applications

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series indexable threading toolholders accepting 266-style inserts with a size code of 16. The catalog reference for this insert is 266RG-16UN01F120E 1135.

Installation Notes

Installation and indexing of threading inserts should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before seating or replacing inserts. Use the appropriate torx or hex key as specified by the toolholder manufacturer to achieve proper insert clamping without over-torquing the seating screw. Verify thread pitch and insert orientation against the toolholder documentation before resuming cutting operations.