Sandvik Coromant 5757935 Laydown Threading Insert

Product Description

The SANDVIK COROMANT 5757935 is a solid carbide laydown threading insert designed for external Metric 60 degree thread forms. Part of the CoroThread 266 series, it carries a dual PVD coating of TiCrAlN and TiAlN for wear resistance and thermal stability at the cutting edge. The insert features a 1.25 mm pitch, a 3/8 inch (9.53 mm) inscribed circle, and a 5/32 inch (3.97 mm) thickness. It is sized under the 266RG-16MM01A125M designation with manufacturer grade 1125, indicating a carbide substrate and coating combination suited to threading operations on steel and similar workpiece materials. Installation is performed by trained machinists on CNC lathes and turning centers.

This insert is applied in right-hand external threading operations on Metric 60 degree thread forms. Typical use is in CNC turning centers and manual lathes equipped with CoroThread 266 compatible toolholders. The chipbreaker designation A and the single tooth-per-side geometry make it appropriate for threading passes on medium to moderate-hardness workpieces. It is a one-insert-per-package item sold with a minimum order quantity of 10 units, making it suitable for shop stocking as a production consumable.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN and TiAlN dual coating for extended tool life
• Right-hand external Metric 60 degree thread form, 1.25 mm pitch
• CoroThread 266 series, insert style 266, size code 16
• Chipbreaker style A for controlled chip formation during threading passes
• 3/8 inch (9.53 mm) inscribed circle, 5/32 inch (3.97 mm) thickness
• Hole diameter 0.1732 inch (4.40 mm) for secure toolholder seating

Compatibility

Designed as an OEM-style replacement insert for CoroThread 266 series toolholders accepting a size 16 laydown threading insert with a 0.1732 inch mounting hole diameter.

Installation Notes

Threading inserts of this type are seated and clamped by a qualified machinist following the toolholder manufacturer torque and clamping procedures for CoroThread 266 holders. Power down and lock out the machine spindle before changing inserts. Inspect the insert pocket and clamping screw for debris or damage before seating the new insert. Confirm thread pitch and hand orientation match the programmed toolpath before resuming cutting.