Sandvik Coromant 5781892 Threading Insert 11.5 Tpi Npt

Product Description

The SANDVIK COROMANT 5781892 is a solid carbide laydown threading insert engineered for right hand external NPT thread cutting at 11.5 threads per inch (TPI). Part of the CoroThread 266 series, it carries a dual PVD coating of TiCrAlN and TiAlN for wear resistance at elevated cutting temperatures. The insert features a 3/8 inch inscribed circle, a 60-degree included angle, and a C-type chipbreaker geometry. It is designed for use on CNC lathes and turning centers where consistent NPT pipe thread profiles are required. Licensed machinists and tooling specialists install and index this insert during threading operations.

This insert is suited for external NPT pipe thread applications in production and job-shop turning environments. The CoroThread 266 platform is commonly used in the machining of pipe fittings, couplings, and hydraulic components requiring tapered NPT thread profiles. At 11.5 TPI, the insert matches standard 3/8 inch NPT thread pitch requirements. The solid carbide substrate combined with PVD coating makes it appropriate for medium to high cutting speeds in steel, stainless, and alloy workpiece materials.

Key Features

• Solid carbide substrate with dual PVD coating: TiCrAlN and TiAlN for extended tool life
• Right hand external NPT thread profile at 11.5 TPI with 60-degree included angle
• CoroThread 266 series insert style 266, size code 16
• C-type chipbreaker for controlled chip formation during threading passes
• 3/8 inch (9.53 mm) inscribed circle for compatible holder seating
• Single tooth per side geometry for precise thread form control

Compatibility

Designed as an OEM-style replacement insert for CoroThread 266 series threading toolholders accepting size 16 laydown inserts with a 0.1732 inch hole diameter. Consult the SANDVIK COROMANT CoroThread 266 toolholder selection guide to confirm holder compatibility before ordering.

Installation Notes

Insert indexing and replacement should be performed by a qualified machinist with the machine in a full stop condition and all axes locked. Use the correct torque wrench and insert screw specified by the toolholder manufacturer to avoid seat damage or insert fracture. Inspect the toolholder pocket and clamping screw for wear or contamination before seating a new insert. Follow your facility safety procedures and applicable OSHA machine guarding requirements during tooling changes.