Sandvik Coromant 5857609 Threading Insert 12 Tpi Stub Acme

Product Description

The SANDVIK COROMANT 5857609 is a solid carbide laydown threading insert from the CoroThread 266 series, designed for cutting internal Stub Acme threads in precision machining applications. Configured for right-hand cutting, this insert carries a 12 TPI thread form with a 60-degree included angle and a 3/8-inch inscribed circle. The PVD-applied TiCrAlN/TiN coating improves wear resistance and extends tool life in demanding threading operations. The F chipbreaker geometry supports controlled chip evacuation. Machinists and CNC operators working in job shops, tool rooms, or production environments will find this insert suited for threading steel and other machinable alloys.

This insert is used in internal threading operations producing Stub Acme thread profiles, which are common in power transmission components, lead screws, and mechanical actuator assemblies. The CoroThread 266 insert style fits compatible SANDVIK COROMANT CoroThread 266 toolholders designed for the 16 insert size code. It is appropriate for CNC lathes and turning centers performing single-point threading passes on bores and internal features requiring the Stub Acme thread standard.

Key Features

• Solid carbide substrate for rigidity and wear resistance in internal threading
• PVD TiCrAlN/TiN coating for extended tool life and heat resistance
• Right-hand internal Stub Acme thread form at 12 TPI with 60-degree included angle
• F chipbreaker geometry for controlled chip flow in threading passes
• 3/8-inch inscribed circle with 0.1732-inch hole diameter for secure insert seating
• Insert thickness of 5/32 inch (0.1563 inch) for precise laydown positioning

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholders accepting the 16 insert size code and configured for right-hand internal threading. Verify holder specification against manufacturer catalog number 266RL-16SA01F120E 1135 before ordering.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down the machine and follow lockout/tagout procedures before seating or replacing threading inserts. Use the correct torque wrench and insert screw as specified by the toolholder manufacturer to avoid insert rocking or premature failure. Inspect the insert pocket and clamping components for wear or debris before each insert change.