Sandvik Coromant 5757929 Threading Insert 4 Tpi Acme

Product Description

The SANDVIK COROMANT 5757929 is a solid carbide laydown threading insert designed for right-hand external Acme thread cutting at 4 threads per inch (TPI). Part of the CoroThread 266 series, this insert features a PVD-applied TiN coating that extends tool life in demanding threading operations. It carries manufacturer grade 1020 and an included angle of 60 degrees. The 1/2-inch (12.70 mm) inscribed circle and 5.56 mm (0.2190 inch) thickness fit standard CoroThread 266 toolholders. Machinists and toolroom technicians install this insert on CNC lathes and manual threading setups when producing precision Acme-profile external threads.

This insert is suited for single-point threading of Acme-standard external threads in production and job-shop environments. The F chipbreaker geometry targets controlled chip flow during thread form passes. With one tooth per side and a 4 TPI designation, it is appropriate for coarse Acme thread profiles commonly found in lead screws, jack screws, and linear motion components. The 0.2244-inch (5.70 mm) hole diameter aligns with CoroThread 266 series insert seating. Sold individually, with a minimum order quantity of 10 units.

Key Features

• Solid carbide substrate with PVD TiN coating for extended wear resistance
• Right-hand external Acme thread profile at 4 TPI with 60-degree included angle
• CoroThread 266 series insert style — compatible with 266 series toolholders
• F chipbreaker for controlled chip management during threading passes
• 1/2-inch inscribed circle (12.70 mm) with 5.56 mm thickness
• Insert size code 22 — manufacturer catalog number 266RG-22AC01F040E 1020

Compatibility

Designed for use with CoroThread 266 series threading toolholders that accept insert size code 22 with a 5.70 mm hole diameter. No additional model-specific compatibility data was provided in the product input.

Installation Notes

Insert replacement should be performed by a qualified machinist with the machine in a safe, powered-down state and all motion axes locked or at rest. Use the appropriate torque wrench and insert key specified for CoroThread 266 toolholders — do not over-tighten the clamping screw. Verify insert seating and alignment before resuming cutting operations. Handle solid carbide inserts carefully to avoid chipping the cutting edge during installation.