Iscar 5902115 Threading Insert 18 Tpi Npt IC908 Carbide

Product Description

The ISCAR 5902115 is a laydown-style external threading insert engineered for NPT thread-form cutting on CNC lathes and turning centers. Built from submicron-grade solid carbide with a PVD-applied TiAlN coating, the IC908 grade delivers wear resistance and edge integrity across a broad range of workpiece materials. The insert cuts right-hand external NPT threads at 18 threads per inch (TPI) with a 3/8-inch inscribed circle and a 0.002-inch corner radius. It is designed for machinists and toolroom operators running production or job-shop threading operations where consistent thread form and insert life are critical.

This insert is suited for external NPT pipe thread applications in both production and maintenance machining environments. The universal primary workpiece material classification means it performs across steel, stainless, cast iron, non-ferrous alloys, and high-temperature alloys. Typical use cases include threading hydraulic fittings, pipe nipples, and fluid-system components where NPT sealing-thread accuracy is required. The insert seats in the laydown orientation within compatible 16ER-series toolholders.

Key Features

• IC908 submicron solid carbide grade with PVD TiAlN coating for extended tool life
• 18 TPI NPT thread form, right-hand external cut
• 3/8-inch (9.52 mm) inscribed circle for use in 16ER-series toolholders
• 0.002-inch corner radius for accurate NPT thread-form geometry
• Universal material grade compatibility: steel, stainless, cast iron, non-ferrous, and high-temperature alloys
• Compliant with ISO 13399 cutting tool data standards

Compatibility

Designed for use in 16ER-series laydown threading toolholders. The 16ER insert style and 3/8-inch inscribed circle must match the designated pocket geometry of the toolholder for proper seating and thread-form accuracy.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's clamping procedure. Power down and lock out the machine before indexing or replacing inserts. Use the correct torque wrench and seating screw specified by the toolholder manufacturer — do not overtighten the clamping screw. Verify insert seating and thread-form accuracy with a calibrated NPT thread gauge before running production parts.