Sandvik Coromant 5857574 Threading Insert 32 Tpi Un

Product Description

The SANDVIK COROMANT 5857574 is a laydown threading insert from the CoroThread 266 series, designed for external UN thread cutting on metalworking lathes and turning centers. Built from solid carbide with a PVD-applied TiCrAlN/TiN coating, this right-hand insert delivers consistent thread form at 32 threads per inch with a 60-degree included angle. The 3/8-inch inscribed circle and 5/32-inch thickness conform to standard insert seat dimensions. A single-tooth-per-side geometry combined with the A-series chipbreaker makes it well suited for controlled chip management in threading passes on steel and alloy materials.

This insert is intended for professional machining applications where precise external UN thread profiles are required. It fits lathes and CNC turning centers equipped with CoroThread 266 insert-style toolholders accepting a size 16 insert. Typical use cases include production threading of fasteners, fittings, and threaded shaft features in job shop and production environments. Installation and use require a qualified machinist or CNC programmer operating appropriate turning equipment.

Key Features

• Solid carbide substrate provides hardness and thermal stability during threading passes
• PVD TiCrAlN/TiN coating improves wear resistance and edge integrity
• 32 TPI external UN thread form with 60-degree included angle
• Right-hand cutting orientation for standard external thread direction
• A-series chipbreaker geometry for controlled chip formation
• 3/8-inch (9.53 mm) inscribed circle fits size 16 CoroThread 266 toolholders

Compatibility

Designed for use with CoroThread 266 series threading toolholders accepting insert size code 16 for external UN thread applications.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's guidelines. Power down and lock out the spindle before changing inserts. Verify insert seating and clamp torque using the toolholder manufacturer's recommended procedure. Do not use damaged or chipped inserts, as thread form accuracy and tool integrity depend on a sound cutting edge.