Sandvik Coromant 5757931 Laydown Threading Insert

Product Description

The SANDVIK COROMANT 5757931 is a solid carbide laydown threading insert designed for external Metric 60-degree thread cutting operations. Part of the CoroThread 266 series, this insert features a dual-layer PVD coating of TiAlN and TiCrAlN for extended tool life in demanding threading applications. It carries a 0.75 mm pitch and is configured for right-hand cutting. The insert measures 3/8 inch (9.53 mm) inscribed circle and 5/32 inch (3.97 mm) thick, with a chipbreaker style A geometry. Installed by machinists and tooling technicians, this insert suits precision CNC and manual lathe threading work where dimensional accuracy and surface finish are critical.

This insert is suited for external threading on turned components requiring Metric 60-degree thread profiles. The 0.75 mm pitch targets fine-thread applications on smaller-diameter workpieces. The CoroThread 266 platform is a common choice in production turning environments where consistent thread quality and repeatable insert changeover are priorities. Typical applications include threading on steel and alloy components in general manufacturing, automotive, and aerospace part production.

Key Features

• Solid carbide substrate with PVD-applied TiAlN and TiCrAlN dual-layer coating for wear resistance
• External right-hand Metric 60-degree thread geometry, 0.75 mm pitch
• 3/8 inch (9.53 mm) inscribed circle; 5/32 inch (3.97 mm) nominal thickness
• Chipbreaker style A for controlled chip formation in threading passes
• Part of the CoroThread 266 series — manufacturer grade 1125
• Single cutting tooth per side; hole diameter 0.1732 inch (4.40 mm)

Compatibility

Designed for use in CoroThread 266 series toolholders accepting insert size code 16 laydown threading inserts. Manufacturer catalog reference: 266RG-16MM01A075M 1125.

Installation Notes

Installation should be performed by qualified tooling technicians with the machine fully powered down and in a locked-out state before insert changeover. Seat the insert firmly in the holder pocket and torque the clamping screw to the toolholder manufacturer's specification — do not use impact tools. Verify insert orientation for right-hand cutting direction before resuming operation. Inspect the pocket and clamping components for wear or debris before seating a new insert.