Sandvik Coromant 5757918 Laydown Threading Insert 14 Tpi Nptf

Product Description

The SANDVIK COROMANT 5757918 is a solid carbide laydown threading insert engineered for right-hand external NPTF thread cutting at 14 threads per inch. Part of the CoroThread 266 series, it carries a dual PVD coating of TiCrAlN and TiAlN under the manufacturer grade designation 1125. The insert features a 3/8-inch inscribed circle, a thickness of 5/32 inch (0.1563 inch decimal), and a 60-degree included angle with a single tooth per side and an A-style chipbreaker. It is sized for insert size code 16 and suits precision threading operations where consistent thread form and tool life are priorities for machining professionals.

This insert is intended for external NPTF tapered pipe thread applications requiring accurate 14 TPI cutting on metals. The CoroThread 266 platform is commonly used in CNC turning centers and dedicated threading lathes in production and job-shop environments. Machinists and tooling specialists working on pipe fittings, manifolds, and fluid-system components will find this insert appropriate for achieving pressure-tight NPTF thread forms in a single-pass or multi-pass threading cycle.

Key Features

• Solid carbide substrate with dual PVD coating: TiCrAlN and TiAlN for elevated wear resistance
• Right-hand external NPTF thread profile at 14 TPI with 60-degree included angle
• A-style chipbreaker for controlled chip evacuation during threading passes
• 3/8-inch (9.53 mm) inscribed circle, 5/32-inch (3.97 mm) thickness — insert size code 16
• CoroThread 266 series platform for compatibility with corresponding toolholders
• Manufacturer grade 1125 suited to a broad range of workpiece materials

Compatibility

Designed for use with CoroThread 266 series toolholders accepting insert size code 16 laydown threading inserts. Refer to the SANDVIK COROMANT CoroThread 266 toolholder selection guide to confirm correct holder pairing for your specific machine and application.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist with the machine spindle fully stopped and all motion controls locked out per shop safety procedures. Use the appropriate torx or clamp-screw driver specified by the toolholder manufacturer to seat the insert firmly without over-torquing the clamping screw. Confirm insert orientation and hand designation match the programmed threading direction before resuming the cycle. Inspect the insert seating pocket for chips or debris before each insert change to avoid improper seating and premature edge failure.