Sandvik Coromant 5757992 Threading Insert 12 Tpi Unj

Product Description

The SANDVIK COROMANT 5757992 is a laydown threading insert from the CoroThread 266 series, designed for external UNJ thread-form cutting at 12 threads per inch. Constructed from solid carbide with a PVD-applied TiCrAlN/TiAlN dual-layer coating, this insert delivers wear resistance and edge stability in demanding threading operations. It carries a 3/8 inch inscribed circle, a thickness of 0.1563 inches, and a 60-degree included angle. Intended for right-hand cutting, it is suited for CNC turning centers and threading applications where consistent thread form and tight tolerances are required. Machining professionals and toolroom technicians are the primary users.

This insert is applied in precision external threading on materials where a UNJ thread form is specified, including aerospace and defense components that require the controlled root radius of the UNJ standard. The CoroThread 266 series is engineered for stable, repeatable threading passes on CNC lathes and turning machines. With a single tooth per side and an A-style chipbreaker, chip control is managed across a range of feed and depth conditions typical of 12 TPI threading cycles. The 1125 grade designation identifies the substrate and coating combination appropriate for this application.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiAlN dual-layer coating for extended tool life
• 12 TPI external UNJ thread form with 60-degree included angle
• Right-hand cutting orientation for standard CNC threading operations
• A-style chipbreaker for controlled chip formation during threading passes
• 3/8 inch inscribed circle and 0.1563 inch thickness for CoroThread 266 toolholder compatibility
• Manufacturer grade 1125 — PVD-coated carbide grade suited for threading in a range of workpiece materials

Compatibility

Designed for use in SANDVIK COROMANT CoroThread 266 series toolholders accepting a 16 insert size code with a 0.1732 inch hole diameter. Specific toolholder compatibility should be verified against the CoroThread 266 system documentation using insert style 266 and size code 16.

Installation Notes

Threading inserts should be seated and clamped according to the toolholder manufacturer torque and clamping specifications — do not use impact tools during insert changes. Ensure the machine spindle and all axes are at a full stop before indexing or replacing inserts. Confirm insert hand orientation and thread form match the programmed threading cycle before engaging the workpiece. Minimum order quantity for this insert is 10 pieces; package quantity is 1.