Sandvik Coromant 5781926 Threading Insert 12 Tpi 3/8 Inch Ic

Product Description

The SANDVIK COROMANT 5781926 is a laydown threading insert designed for external UN thread cutting operations on CNC lathes and turning centers. Part of the CoroThread 266 series, it is made from solid carbide with a PVD-applied TiCrAlN/TiAlN dual-layer coating that extends tool life in both steel and stainless steel applications. The insert cuts right-hand external threads at 12 threads per inch with a 60-degree included angle. It measures 3/8 inches inscribed circle and 5/32 inches thick. Machinists and CNC operators install this insert on compatible CoroThread 266 toolholders for precision threading work in production environments.

This insert is suited for external UN threading in medium to high-volume turning applications. The C chipbreaker geometry supports controlled chip evacuation during threading passes. At 12 TPI, it covers common fastener and fitting thread pitches used in industrial, hydraulic, and mechanical assemblies. The single-tooth cutting edge profile delivers consistent thread form across repeated passes. It is typically used in job shop and production machining environments where UN-standard thread accuracy is required.

Key Features

• Solid carbide substrate provides rigidity and wear resistance for threading interrupted and continuous cuts
• PVD TiCrAlN/TiAlN coating improves surface hardness and heat resistance at the cutting edge
• Right-hand external UN thread geometry at 12 TPI with 60-degree included angle
• C chipbreaker design promotes chip control during threading cycles
• 3/8 inch (9.53 mm) inscribed circle with 0.1732 inch hole diameter for secure toolholder mounting
• CoroThread 266 series insert style 266 for use with matching 266-series toolholders

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series toolholding systems accepting insert size code 16 with a 0.1732 inch (4.40 mm) hole diameter. Consult the CoroThread 266 toolholder selection guide to confirm holder compatibility before installation.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machine spindle before seating or changing inserts. Use the appropriate torx or insert clamping screw torque tool per the toolholder manufacturer specification. Inspect the insert pocket and clamping screw for wear or damage before installing a new insert to ensure proper seating and thread form accuracy.