Sandvik Coromant 5757987 Threading Insert Carbide Unj

Product Description

The SANDVIK COROMANT 5757987 is a carbide threading insert designed for external thread cutting operations. It belongs to the CoroThread 266 series and carries manufacturer grade 1125, a PVD-coated carbide grade suited for threading in a range of workpiece materials. The insert profile follows the UNJ thread standard with a 60-degree included angle and a right-hand cutting orientation. At 0.1563 inches (3.97 mm) thick, it is engineered for indexable toolholders in the CoroThread 266 system. Licensed machinists and CNC operators rely on this insert for precision external thread generation on turning centers and CNC lathes.

This insert is intended for external threading applications in precision machining environments, including aerospace, defense, and industrial manufacturing where UNJ thread forms are specified. The UNJ standard features a controlled root radius, making it common in high-stress fastener applications. The CoroThread 266 series is designed for productive, stable threading with reliable chip control. This insert is sold individually but carries a minimum order quantity of 10 units.

Key Features

• Carbide substrate with PVD coating for wear resistance and edge integrity
• UNJ thread standard with 60-degree included angle for precision thread form accuracy
• Right-hand external threading orientation
• Insert style 266RG16NJ01A080E, grade 1125
• Part of the CoroThread 266 indexable threading system
• Thickness of 0.1563 inches for consistent seating in compatible toolholders

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders that accept the 266RG insert style. Consult the CoroThread 266 system documentation to confirm holder and insert compatibility before ordering.

Installation Notes

Installation is performed by CNC machinists and turning center operators. Power down and lock out the machine before indexing or replacing inserts. Use the appropriate Torx or insert-clamping key specified for the CoroThread 266 toolholder to secure the insert without over-driving the clamping screw. Inspect the insert pocket and clamping seat for debris or wear before seating a new insert.