Sandvik Coromant 5757872 Corothread 266 Threading Insert

Product Description

The SANDVIK COROMANT 5757872 is a solid carbide threading insert designed for internal thread cutting on CNC lathes and turning centers. Part of the CoroThread 266 series, it features a Metric 60 Degree thread standard with a 2.00 mm internal pitch and a left-hand insert orientation. The manufacturer grade is 1125, applied via a PVD coating process for extended tool life in a range of workpiece materials. The chipbreaker designation is A, and the insert carries ISO code 266LL16MM01A200M1125. This insert is installed and changed by machinists and CNC operators in production and job-shop environments.

This insert is suited for internal threading operations requiring a left-hand, Metric 60 Degree profile at a 2.00 mm pitch. It fits size 16 CoroThread 266 toolholders and is appropriate for use in both light and medium-duty turning applications on CNC equipment. The PVD-coated 1125 grade performs across a range of steel, stainless, and cast-iron workpiece materials in typical production threading scenarios.

Key Features

• Solid carbide substrate with PVD coating — grade 1125 for wear resistance and edge integrity
• Metric 60 Degree internal thread standard at 2.00 mm pitch
• Left-hand insert orientation for correct thread hand
• Chipbreaker style A for controlled chip formation during internal threading
• Insert size 16, compatible with CoroThread 266 series toolholders
• Thickness of 3.97 mm (0.1563 inches) for precise seating in holder pocket

Compatibility

Designed for use with CoroThread 266 series toolholders accepting size 16 threading inserts. Specific holder compatibility should be confirmed against SANDVIK COROMANT CoroThread 266 toolholder documentation for left-hand internal threading applications.

Installation Notes

Installation is performed by a machinist or CNC operator following standard indexable insert change procedures. Power down and lock out the machine before accessing the toolholder pocket. Use the correct Torx or hex key specified by the toolholder manufacturer to seat the insert without overtightening the clamping screw. Verify insert hand orientation and ISO code match the programmed threading cycle before resuming operation.