Sandvik Coromant 5757942 Threading Insert 18 Tpi Solid Carbide

Product Description

The SANDVIK COROMANT 5757942 is a laydown threading insert designed for external UN thread cutting operations. Part of the CoroThread 266 series, it is manufactured from solid carbide and features a dual-layer PVD coating of TiCrAlN and TiAlN for extended tool life in demanding threading applications. The insert is configured for right-hand cutting at 18 threads per inch with a 60-degree included angle, a 3/8 inch inscribed circle, and a thickness of 5/32 inch (0.1563 inches). It carries manufacturer grade 1125 and chipbreaker designation A. This insert is installed by machinists and CNC operators working in metal fabrication, job shop, and production turning environments.

This insert is suited for external UN threading on CNC lathes and turning centers in both production and job shop settings. The CoroThread 266 platform is engineered for consistent thread form and reliable chip control across a range of workpiece materials. Typical applications include threading of fasteners, fittings, and mechanical components requiring standard unified national thread profiles. The single-tooth-per-side geometry and insert size code 16 configuration make it appropriate for moderate-depth threading passes on ferrous and non-ferrous materials.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN and TiAlN dual-layer coating for wear resistance
• Right-hand external UN thread profile at 18 TPI with 60-degree included angle
• 3/8 inch inscribed circle and 0.1563 inch thickness for precise seating in CoroThread 266 toolholders
• Chipbreaker designation A for controlled chip formation during threading passes
• Insert size code 16 with 0.1732 inch hole diameter for secure clamping
• Single tooth per side geometry suited for consistent thread form on each pass

Compatibility

Designed as an OEM-style replacement threading insert for use in CoroThread 266 series toolholders accepting insert size code 16 with a 3/8 inch inscribed circle and right-hand external UN thread configuration.

Installation Notes

Installation is performed by qualified machinists or CNC technicians. The machine spindle must be stopped and all motion arrested before indexing or replacing inserts. Use the appropriate torque wrench and clamping hardware specified for the CoroThread 266 toolholder to seat the insert correctly. Do not exceed the recommended depth of cut or feed rate for the grade and coating combination, and inspect the insert seat for chips or contamination before seating a new insert.