Sandvik Coromant 5757976 Threading Insert 18 Tpi Npt

Product Description

The SANDVIK COROMANT 5757976 is a laydown threading insert designed for cutting external NPT threads in machining applications. Built from solid carbide and finished with a PVD-applied TiCrAlN/TiAlN dual-layer coating, this insert delivers wear resistance and thermal stability during threading operations. It features a 60-degree included angle, 18 threads per inch, a 3/8 inch inscribed circle, and measures 5/32 inch thick. Belonging to the CoroThread 266 series, it is intended for right-hand external threading and is well suited for machinists and tooling professionals working on pipe fitting and fluid system components requiring NPT thread profiles.

This insert is used in CNC lathe and turning center applications where NPT-standard external threads must be cut with precision and repeatability. The single-tooth-per-side geometry and chipbreaker style A support controlled chip formation during threading passes. Typical applications include producing tapered pipe threads on fittings, valve bodies, and connectors in production and job shop environments. It is sold individually and is subject to a minimum order quantity of 10 units.

Key Features

• Solid carbide substrate with PVD-applied TiCrAlN/TiAlN coating for extended tool life
• 18 TPI for NPT external tapered pipe thread standard
• 60-degree included angle with chipbreaker style A for controlled chip evacuation
• Right-hand cut orientation for standard lathe threading operations
• 3/8 inch inscribed circle and 0.1563 inch thickness for consistent insert seating
• CoroThread 266 series insert style 266, size code 16

Compatibility

Designed as an OEM-style replacement threading insert for CoroThread 266 series toolholders accepting size 16 laydown inserts. Refer to the manufacturer catalog number 266RG-16NT01A180M 1125 for confirmed holder compatibility.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the turning center or CNC lathe is fully powered down and the spindle is locked before seating or replacing the insert. Use the correct torque wrench and insert screw per the toolholder manufacturer's specification. Inspect the insert pocket for debris or damage before mounting to ensure proper seating and thread accuracy.