Iscar 5903398 Threading Insert 8 Tpi Npt IC808 Carbide

Product Description

The ISCAR 5903398 is a solid carbide laydown threading insert designed for external NPT thread cutting at 8 threads per inch (TPI). It carries the IC808 manufacturer grade and features a TiN/TiAlN PVD coating, which provides wear resistance and heat tolerance across a wide range of workpiece materials. The insert uses a right-hand cutting orientation and is classified under the 16ERM insert style with a size code of 16. With a 9.53 mm (3/8 inch) inscribed circle and a thickness of 0.143 inches, this insert fits standard laydown threading toolholders used in CNC lathe and turning center applications. Machinists and toolroom professionals working with NPT threaded fittings and pipe components are the primary users.

This insert is suited for producing external NPT taper pipe threads on turning centers and CNC lathes in production and job-shop environments. The IC808 grade with PVD coating supports threading in universal material classifications including steels, stainless steels, cast irons, non-ferrous metals, and high-temperature alloys, corresponding to ISO material groups H, K, M, N, P, and S. It is part of the ISCARTHREAD series and is appropriate for both light production runs and high-volume thread machining where consistent thread form and tool life are required.

Key Features

• IC808 solid carbide grade with TiN/TiAlN PVD coating for broad material compatibility
• Right-hand external NPT thread profile at 8 TPI
• 16ERM laydown insert style with 9.53 mm inscribed circle
• Thickness of 0.143 inches for secure seating in compatible toolholders
• Corner radius of 0.13 mm (0.0050 inches) for precise thread form
• Chipbreaker style B included for controlled chip evacuation during threading

Compatibility

Designed as an OEM-style replacement threading insert for standard 16ERM-style laydown threading toolholders used in external NPT pipe thread applications on CNC lathes and turning centers.

Installation Notes

Threading inserts of this type are installed and replaced by machinists and CNC toolroom technicians. Always index or replace the insert with the machine powered down and in a safe, locked-out state. Use the appropriate torx or clamping screw driver specified for the toolholder to achieve proper seating torque without overtightening. Verify insert orientation and thread profile against the workpiece drawing before commencing a threading pass.