Sandvik Coromant 5781917 Threading Insert 12 Tpi Un

Product Description

The SANDVIK COROMANT 5781917 is a solid carbide laydown threading insert from the CoroThread 266 series, designed for external UN thread cutting on CNC lathes and turning centers. It features a TiCrAlN/TiN PVD coating applied over a solid carbide substrate, delivering wear resistance and thermal stability during high-speed threading operations. The insert cuts at 12 threads per inch with a 60-degree included angle and a single tooth per side geometry, producing right-hand external threads. With a 3/8-inch inscribed circle and a thickness of 5/32 inches, it fits standard CoroThread 266 toolholders used in precision threading applications.

This insert is suited for threading operations in general machining environments where UN external thread profiles are required. The CoroThread 266 series is commonly used in precision part manufacturing, fluid system components, and fastener production. The TiCrAlN/TiN PVD coating makes it a strong choice for threading a range of steel and stainless alloys. Licensed machinists and CNC operators in job shops, production facilities, and maintenance machine shops are the primary installers of this insert type.

Key Features

• Solid carbide substrate with TiCrAlN/TiN PVD coating for wear and thermal resistance
• 12 TPI external UN thread profile with 60-degree included angle
• Right-hand cut geometry, single tooth per side
• 3/8-inch (9.53 mm) inscribed circle, 5/32-inch (3.97 mm) thickness
• CoroThread 266 series insert style, grade 1135
• Chipbreaker style A for controlled chip evacuation during threading passes

Compatibility

Designed for use with CoroThread 266 series toolholders that accept 16-size laydown threading inserts. Refer to the SANDVIK COROMANT CoroThread 266 toolholder selection guide to confirm holder compatibility before installation.

Installation Notes

Installation is performed by qualified CNC machinists or tooling technicians. The machine spindle must be stopped and the toolholder fully de-energized before seating or replacing inserts. Use the correct torx or insert clamping screw to the manufacturer-specified clamping method for the CoroThread 266 holder style. Inspect the insert pocket and clamping screw for wear or debris before seating the new insert to ensure proper contact and repeatability.