Iscar 5990325 Threading Insert 4 Tpi Un IC908 Tialn

Product Description

The ISCAR 5990325 is a solid carbide laydown threading insert designed for external UN thread cutting at 4 threads per inch. Built to insert style 27ER, it carries ISCAR's IC908 grade with a PVD-applied TiAlN coating, giving it strong wear resistance across a wide range of workpiece materials. The insert is right-hand orientation and fits into compatible 27-series laydown toolholders. With a 15.88 mm (5/8 inch) inscribed circle and a corner radius of 0.85 mm (0.0330 inches), this insert is dimensionally consistent with ISO 13399 standards. It is sold individually with a minimum order quantity of 5 units.

This insert is suited for external threading operations on CNC lathes and turning centers in both job shop and production environments. The IC908 grade with TiAlN finish is rated for universal primary workpiece materials, including steel, stainless steel, cast iron, non-ferrous alloys, high-temperature alloys, and hardened materials, corresponding to ISO material groups H, K, M, N, P, and S. It fits applications where consistent thread form and tool life are priorities across varied material runs.

Key Features

• Insert style 27ER for external UN threading at 4 TPI
• IC908 carbide grade with PVD TiAlN coating for broad material compatibility
• Right-hand cutting orientation
• 15.88 mm inscribed circle (5/8 inch) for precise seating in 27-series holders
• Corner radius of 0.85 mm (0.0330 inches) for accurate thread root profile
• Compliant with ISO 13399 tooling data standards

Compatibility

Designed for use in 27ER-style laydown threading toolholders within the ISCARTHREAD series. Compatible across ISO material groups H, K, M, N, P, and S as rated for the IC908 grade.

Installation Notes

Installation is performed by a machinist or CNC tooling technician. Before seating the insert, ensure the toolholder pocket is clean and free of chips or debris that could affect insert positioning. Use the appropriate torx or clamping screw torqued per the toolholder manufacturer's specification. Inspect the thread form on the first part before committing to a full production run.