Iscar 5995935 Threading Insert 11 Tpi Un Internal IC908

Product Description

The ISCAR 5995935 is a laydown-style threading insert designed for internal UN thread cutting operations. Built from solid carbide with an IC908 grade designation and a PVD-applied TiAlN coating, this insert delivers hardness and thermal resistance suited to interrupted cuts and multi-pass threading cycles. The insert profiles an 11 TPI UN thread form with a right-hand cutting direction and fits toolholders accepting the 11IR insert style. Inscribed circle diameter is 0.250 inches and overall thickness is 0.126 inches. Licensed machinists and CNC turning center operators use this insert on lathes and turning centers equipped for internal threading.

This insert is intended for internal threading applications on materials spanning multiple workpiece categories, including steel, stainless steel, cast iron, non-ferrous alloys, and heat-resistant superalloys, corresponding to ISO material groups P, M, K, N, S, and H. The IC908 carbide substrate with PVD coating supports consistent thread quality across these material groups in both light and medium-duty cutting conditions. Typical use cases include threading bored holes on precision parts in job-shop and production turning environments.

Key Features

• IC908 solid carbide grade with PVD TiAlN coating for wear resistance across a broad material range
• 11IR insert style in 11 TPI for UN internal thread form
• Right-hand cutting orientation for standard internal threading setups
• 0.250 inch inscribed circle and 0.126 inch thickness for compatibility with standard 11IR toolholders
• Corner radius of 0.0055 inches (0.14 mm) for accurate thread root geometry
• Conforms to ISO 13399 tooling data standards for CAM and tooling management integration

Compatibility

Designed as a direct-fit replacement for 11IR-style internal threading insert seats accepting a 1/4 inch inscribed circle and 0.126 inch thickness. Part of the ISCARTHREAD series.

Installation Notes

Installation is performed by qualified machinists or CNC tooling setup personnel. Power down and lock out the machine spindle before seating or changing the insert. Use the correct torx or clamping screw specified for the toolholder to secure the insert without over-torquing the clamping mechanism. Verify insert orientation for right-hand internal threading before starting the program cycle.