Sandvik Coromant 5757947 Threading Insert 14 Tpi Un

Product Description

The SANDVIK COROMANT 5757947 is a solid carbide laydown threading insert designed for external UN thread cutting at 14 threads per inch. Part of the CoroThread 266 series, it carries a dual PVD coating of TiCrAlN and TiAlN for wear resistance in demanding threading operations. The insert features a right-hand cutting orientation, a 60-degree included angle, and two teeth per side. With an inscribed circle of 3/8 inches and a thickness of 5/32 inches, this insert is sized for precision threading work on CNC lathes and turning centers. It is installed by machinists and toolroom technicians working to UN thread standards.

This insert is suited for external UN threaded profiles in production and job-shop turning environments. The 266RG style and size code 16 fit CoroThread 266 toolholders configured for laydown insert geometry. The chipbreaker designation A and the 14 TPI specification make it appropriate for producing standard unified national thread forms on external diameters. Applications typically include threaded fastener features, fittings, and shaft threads machined from steel and alloy workpiece materials where PVD-coated carbide grades are indicated.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN and TiAlN dual coating for extended tool life
• 14 TPI external UN thread form with 60-degree included angle
• Right-hand cutting orientation for standard lathe threading passes
• Two teeth per side for full-profile UN thread generation
• Inscribed circle of 3/8 inches (9.53 mm) and thickness of 5/32 inches (3.97 mm)
• Manufacturer grade 1125 with chipbreaker style A for controlled chip flow

Compatibility

Designed for use in CoroThread 266 series toolholders accepting size code 16 laydown threading inserts. Confirm holder bore diameter compatibility with the insert hole diameter of 0.1732 inches (4.40 mm) before installation.

Installation Notes

Threading inserts of this type are installed by qualified machinists on CNC or manual turning equipment. Power down and lock out the machine spindle before seating or removing inserts. Use the correct torx or hex key torque tool per the toolholder manufacturer's seating specification — do not overtighten the clamping screw. Verify insert orientation and hand designation match the programmed thread pass direction before cutting.