Sandvik Coromant 5757916 Laydown Threading Insert Nptf

Product Description

The SANDVIK COROMANT 5757916 is a solid carbide laydown threading insert engineered for right-hand external NPTF threading operations. Part of the CoroThread 266 series, this insert carries a dual PVD coating of TiAlN and TiCrAlN for extended tool life in demanding thread-cutting applications. It is sized with a 3/8 inch inscribed circle and cuts at 11.5 threads per inch with a 60-degree included angle. Manufactured to grade 1125, it suits CNC lathe and turning center setups where consistent NPTF thread form accuracy is required. Machinists and tooling specialists working in precision threading applications will find this insert ready for direct installation into compatible CoroThread 266 toolholders.

This insert is intended for external NPTF thread production on CNC turning equipment in metalworking environments. NPTF threads are used in pipe fitting and fluid-power applications where pressure-tight connections are required without sealants. The 266RG-16NF01A115E 1125 designation specifies insert style 266, size code 16, chipbreaker designation A, and grade 1125. It is applicable in both production shop and job-shop environments where tapered pipe thread accuracy and surface finish are critical. This insert is sold individually with a minimum order quantity of 10 units.

Key Features

• Solid carbide construction with PVD-applied TiAlN and TiCrAlN dual coating for wear resistance
• Right-hand external NPTF thread form at 11.5 TPI with 60-degree included angle
• 3/8 inch (9.53 mm) inscribed circle, insert size code 16
• Chipbreaker style A for controlled chip formation during threading passes
• CoroThread 266 series compatibility for use with matching Sandvik Coromant toolholders
• Manufacturer grade 1125 optimized for consistent thread quality in steel and similar materials

Compatibility

Designed for use with SANDVIK COROMANT CoroThread 266 series threading toolholders that accept size code 16 laydown inserts. Specific toolholder compatibility should be confirmed against Sandvik Coromant toolholder documentation using insert style code 266RG-16NF01A115E 1125.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician familiar with CNC lathe insert replacement procedures. Ensure the machine is powered down and the spindle is locked before removing or seating the insert. Verify the insert pocket and clamping screw are clean and undamaged before torquing the clamp to the toolholder specification found in the Sandvik Coromant toolholder documentation. Do not use damaged or chipped inserts, as compromised cutting edges will produce out-of-tolerance NPTF thread forms.