Sandvik Coromant 5757949 Threading Insert 16 Tpi Un Carbide

Product Description

The SANDVIK COROMANT 5757949 is a solid carbide laydown threading insert engineered for right-hand external UN threading operations. Part of the CoroThread 266 series, it carries a dual PVD coating of TiCrAlN and TiAlN for wear resistance in demanding threading applications. The insert cuts at 16 threads per inch with a 60-degree included angle and features a 3/8 inch (9.53 mm) inscribed circle and a thickness of 5/32 inch (0.1563 inch decimal). It is sized with insert size code 16 and uses an A-style chipbreaker. Machinists and CNC operators install this insert in CoroThread 266 compatible toolholders for precision thread turning on lathes and turning centers.

This insert is suited for external UN thread turning in production and job-shop environments. The 266 series is commonly applied in horizontal and vertical turning setups where consistent thread form and tool life are priorities. With two teeth per side and a manufacturer grade of 1125, it is appropriate for threading steel, alloy steel, and similar workpiece materials where a PVD-coated carbide grade performs reliably. It ships in individual packaging with a minimum order quantity of 10 pieces.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN and TiAlN dual coating for extended wear resistance
• Right-hand external UN thread form, 16 TPI, 60-degree included angle
• 3/8 inch inscribed circle and 5/32 inch thickness (0.1563 inch decimal)
• A-style chipbreaker with 2 teeth per side for controlled chip flow
• Insert size code 16, manufacturer grade 1125, part of the CoroThread 266 series
• Mounting hole diameter of 0.1732 inch (4.40 mm) for secure clamping in compatible holders

Compatibility

Designed for use in CoroThread 266 series toolholders that accept size-16 laydown threading inserts for right-hand external UN thread turning applications.

Installation Notes

Installation is performed by machinist or CNC tooling personnel. The machine spindle must be stopped and all energy locked out before seating or replacing the insert. Use the correct torx or clamping key specified for the CoroThread 266 holder to secure the insert without overtightening. Inspect the seating pocket for chips or debris before each insert change to ensure proper insert orientation and thread form accuracy.