Iscar 5921255 Threading Insert 16 Tpi Un External IC808

Product Description

The ISCAR 5921255 is a laydown-style solid carbide threading insert designed for external UN (Unified National) thread forms at 16 threads per inch (TPI). Coated with a PVD-applied TiAlN finish and offered in manufacturer grade IC808, this insert is built for consistent thread profile accuracy on a wide range of workpiece materials. The right-hand cutting geometry and M-chipbreaker designation make it a practical choice for production threading operations where chip control and tool life are priorities. Qualified machinists and CNC lathe operators working in job shops, production facilities, and toolrooms are the primary users.

This insert is suited for external threading applications on turning centers and engine lathes where UN thread standards are required. The 16ERM insert style fits compatible ISCAR ISCARTHREAD toolholders designed for laydown threading inserts. With a universal primary workpiece material classification, the IC808 grade handles a broad spectrum of materials including steels, stainless steels, cast irons, non-ferrous alloys, and high-temperature superalloys. It is appropriate for both light production runs and higher-volume threading cycles where dimensional consistency is required.

Key Features

• Solid carbide substrate with PVD TiAlN coating for wear resistance and thermal stability
• 16 TPI UN external thread form, right-hand cutting direction
• IC808 manufacturer grade rated for universal workpiece material compatibility (H, K, M, N, P, S material codes)
• 3/8 inch (0.3750 inch) inscribed circle with 0.143 inch insert thickness
• M-chipbreaker geometry for effective chip control during threading passes
• Conforms to ISO 13399 tooling data standards

Compatibility

Designed for use with ISCAR ISCARTHREAD series toolholders that accept the 16ERM laydown threading insert style. Verify toolholder pocket geometry and clamping method before installation.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully and evenly in the toolholder pocket and secure the clamping screw to the toolholder manufacturer's specified procedure before resuming cutting. Inspect the insert seat and clamping components for wear or debris prior to installation to ensure proper insert support and thread profile accuracy.