Iscar 5901961 Laydown Threading Insert 16ER16UN IC908

Product Description

The ISCAR 5901961 is a laydown-style carbide threading insert designed for external UN thread forms. It carries the IC908 grade designation, a PVD-coated solid carbide with a TiAlN finish engineered for wear resistance and thermal stability at the cutting edge. The insert cuts right-hand external threads at 16 threads per inch, fits a 3/8-inch (0.375 inch) inscribed circle toolholder seat, and measures 0.143 inches thick. It is intended for use on CNC lathes and turning centers by machinists and toolroom technicians performing precision threading operations.

This insert is suited for single-point threading passes on a wide range of workpiece materials. The IC908 grade with PVD coating covers universal application across carbon steels, alloy steels, cast irons, stainless, high-temperature alloys, and non-ferrous materials, corresponding to ISO material groups P, M, K, N, S, and H. It fits standard 16ER-style laydown threading toolholders. Typical use is production threading on shaft diameters requiring unified national (UN) thread forms in both job-shop and production-floor environments.

Key Features

• IC908 solid carbide grade with PVD-applied TiAlN coating for elevated cutting-edge hardness and heat resistance
• 16 TPI external UN thread standard, right-hand cut
• 16ER insert style with 3/8-inch inscribed circle (0.375 inch) for compatibility with standard 16ER toolholders
• 0.143-inch insert thickness for precise seating in laydown-style pockets
• Corner radius of 0.18 mm for defined thread root geometry
• Compliant with ISO 13399 tooling data standards

Compatibility

Designed as a direct-fit replacement for standard 16ER-style laydown threading toolholders requiring a 3/8-inch inscribed circle insert with a UN external thread form. Compatible with workpiece material grades C1, C2, C6, and C7 per ISO designation.

Installation Notes

This insert is installed by a machinist or toolroom technician on a CNC lathe or manual turning center. Power down and lock out the spindle before changing inserts. Seat the insert fully into the toolholder pocket and torque the clamping screw to the toolholder manufacturer's specification — do not use impact tools on insert clamping hardware. Verify thread pitch and insert orientation before taking a first threading pass.