Iscar 5902391 Threading Insert 4 Tpi Acme IC908 Carbide

Product Description

The ISCAR 5902391 is a solid carbide laydown threading insert designed for external Acme thread cutting at 4 threads per inch (TPI). It carries the IC908 manufacturer grade with a PVD-applied TiAlN coating, offering wear resistance across a broad range of workpiece materials. The insert features a 1/2 inch (0.5000 inch decimal) inscribed circle and a thickness of 0.188 inches. It is used in right-hand external threading operations and follows the ISO 13399 standard for cutting tool data representation. This insert is part of the ISCARTHREAD series and is intended for installation by machinists and tooling professionals in production and job-shop environments.

This insert is suited for external Acme thread forms at 4 TPI on a variety of workpiece materials, including steel, stainless steel, cast iron, non-ferrous metals, and high-temperature alloys, as indicated by the primary workpiece material codes H, K, M, N, P, and S. The Acme thread standard is common in lead screws, power transmission components, and industrial machinery applications. The IC908 grade with TiAlN coating supports use across these material categories with a single insert style, reducing the need for grade changes across diverse jobs.

Key Features

• Solid carbide construction with PVD TiAlN coating for extended tool life
• IC908 grade rated for universal workpiece material compatibility (H, K, M, N, P, S material codes)
• Right-hand external Acme thread form at 4 TPI
• 1/2 inch inscribed circle (0.5000 inch decimal) laydown insert geometry
• Complies with ISO 13399 cutting tool data standard
• Part of the ISCARTHREAD series for consistent toolholder compatibility

Compatibility

Designed as an OEM-style replacement threading insert for toolholders accepting 22ER-style laydown inserts within the ISCARTHREAD series.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before changing inserts. Seat the insert firmly and evenly in the toolholder pocket and secure with the appropriate clamping screw to the toolholder manufacturer's specified procedure. Verify thread form and pitch with a thread gauge before running production.