Sandvik Coromant 5757954 Threading Insert 12 Tpi Un

Product Description

The SANDVIK COROMANT 5757954 is a laydown threading insert designed for cutting internal UN threads in precision machining applications. Part of the CoroThread 266 series, this solid carbide insert carries a dual PVD coating of TiCrAlN and TiAlN for improved wear resistance and tool life. It is configured for right-hand internal threading at 12 threads per inch (TPI) with a 60-degree included angle. The insert measures 3/8 inches inscribed circle and 5/32 inches thick. It is sized to the 266RL-16UN01A120M 1125 catalog designation and is intended for use by machinists and CNC operators in industrial threading operations.

This insert is suited for internal UN thread forming on CNC lathes and turning centers in manufacturing environments. The A chipbreaker geometry supports controlled chip evacuation during internal threading passes. With a single tooth per side and compact insert geometry, it is commonly used in production threading of fittings, connectors, and threaded bores requiring standard UN thread form compliance. The manufacturer grade 1125 indicates a PVD-coated carbide substrate optimized for threading ferrous and non-ferrous workpiece materials under stable cutting conditions.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN and TiAlN dual coating for wear resistance
• Right-hand internal UN thread form at 12 TPI with 60-degree included angle
• CoroThread 266 series insert style with A chipbreaker geometry
• 3/8-inch inscribed circle (9.53 mm) and 5/32-inch thickness (3.97 mm)
• Insert size code 16 with 0.1732-inch hole diameter for secure clamping
• Manufacturer grade 1125 for consistent performance in production threading

Compatibility

Designed for use with CoroThread 266 series toolholders that accept size 16 laydown threading inserts with the corresponding bore and seating geometry for internal UN thread applications.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. The machine spindle must be stopped and all motion arrested before seating or removing the insert. Use the appropriate torx or clamping screw driver specified for the CoroThread 266 holder to secure the insert without over-torquing the clamp screw. Verify thread form, TPI, and hand orientation against the workpiece drawing before initiating a threading cycle.