Sandvik Coromant 5757994 Threading Insert 14 Tpi

Product Description

The SANDVIK COROMANT 5757994 is a laydown threading insert designed for precision external thread cutting on metalworking lathes and turning centers. Part of the CoroThread 266 series, it is manufactured from solid carbide with a PVD-applied TiAlN and TiCrAlN dual coating that provides heat resistance and extended tool life. The insert produces right-hand external UNJ threads at 14 threads per inch with a 60-degree included angle. It features a 3/8 inch (9.53 mm) inscribed circle and a thickness of 5/32 inch (0.1563 inch decimal). This insert is sized at insert size code 16 and carries a single tooth per side with chipbreaker style A. It is intended for use by machinists and tool-room professionals in production and job-shop environments.

This insert is suited for external UNJ thread-form applications in aerospace, defense, and precision machining contexts where tight thread tolerances are required. The UNJ thread standard incorporates a controlled radius at the root, making it a common specification for high-strength fastener applications. The CoroThread 266 insert style and grade 1125 substrate combination is matched to threading operations on a range of metallic workpiece materials. Installation into a compatible 266-series toolholder positions the insert at the correct geometry for consistent thread profile and surface finish across production runs.

Key Features

• Solid carbide substrate with PVD TiAlN and TiCrAlN coating for thermal stability and wear resistance
• Right-hand external UNJ thread form at 14 TPI with 60-degree included angle
• 3/8 inch inscribed circle with 0.1563 inch (5/32 inch) thickness
• Chipbreaker style A for controlled chip evacuation during threading passes
• CoroThread 266 series with insert size code 16 and single tooth per side
• Manufacturer grade 1125 for consistent performance across threading applications

Compatibility

Designed for use with compatible SANDVIK COROMANT CoroThread 266 series toolholders that accept size 16 laydown threading inserts. Manufacturer catalog number 266RG-16NJ01A140E 1125. Verify toolholder seat geometry and clamping system before installation.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's clamping torque and seating instructions. Power down and lock out the machine spindle before changing inserts. Inspect the toolholder pocket for debris or damage before seating the insert. Do not force the insert into the pocket; proper seating ensures correct thread geometry and prevents premature edge failure.