Sandvik Coromant 5781888 Threading Insert 8 Tpi Npt

Product Description

The SANDVIK COROMANT 5781888 is a laydown threading insert from the CoroThread 266 series, designed for cutting external NPT threads at 8 threads per inch. It is machined from solid carbide and finished with a PVD-applied TiCrAlN/TiN coating for improved wear resistance and tool life at elevated cutting temperatures. The insert features a 60-degree included angle, a 3/8-inch inscribed circle, and a right-hand cutting orientation. It is sized at 5/32 inch thick and carries a manufacturer grade of 1135. CNC machinists and tooling specialists install this insert in compatible CoroThread 266 toolholders on turning centers and lathes.

This insert is suited for producing external NPT pipe threads on turning centers in both production shop and job shop environments. The NPT thread standard makes it applicable to pipe fittings, fluid system components, and hydraulic or pneumatic connection parts where tapered thread sealing is required. The chipbreaker designation A and single tooth-per-side geometry support controlled chip formation in threading operations. It is sold individually with a minimum order quantity of 10 units.

Key Features

• Solid carbide substrate with PVD TiCrAlN/TiN coating for extended tool life
• Right-hand external NPT thread form at 8 TPI with 60-degree included angle
• CoroThread 266 series insert style for use in compatible SANDVIK COROMANT toolholders
• 3/8-inch inscribed circle with 0.1732-inch hole diameter for secure seating
• Chipbreaker style A supports consistent chip control during threading passes
• Weighs 0.12 pounds per unit; compact profile at 1.54 inches wide and 3.74 inches long

Compatibility

Designed for use in SANDVIK COROMANT CoroThread 266 series toolholders that accept insert size code 16 laydown threading inserts. Specific compatible toolholder part numbers were not provided in the available data; consult SANDVIK COROMANT toolholder selection guides for confirmed fitment.

Installation Notes

Installation is performed by qualified machinists or tooling technicians on CNC turning centers or manual lathes. Power down and lock out the machine before changing inserts. Seat the insert fully in the pocket and torque the clamping screw to the toolholder manufacturer specification using the correct Torx or hex key. Inspect the insert pocket for chips or wear before seating a new insert to ensure proper clamping and thread geometry.