Iscar 5993425 Threading Insert 20 Tpi Un IC228 Carbide

Product Description

The ISCAR 5993425 is a solid carbide laydown threading insert designed for cutting internal UN threads at 20 threads per inch. Finished with a PVD-applied TiCN/TiN coating, this right-hand insert offers improved wear resistance and surface finish on a broad range of workpiece materials. It carries ISCAR manufacturer grade IC228 and conforms to ISO 13399 standards. The 3/16-inch inscribed circle and 0.079-inch thickness place it in the compact 08IR insert style, suited for smaller-bore internal threading operations on CNC lathes and turning centers. Machinists and toolroom operators in production and job-shop environments rely on this insert for consistent thread-form accuracy on UN-standard profiles.

This insert is used in internal threading applications on ferrous metals, non-ferrous alloys, heat-resistant superalloys, and other materials corresponding to ISO workpiece material groups H, K, M, N, P, and S. It fits standard 08IR toolholders and is appropriate for CNC turning centers performing right-hand internal UN threading passes on components such as fittings, couplings, and threaded bores requiring 20 TPI UN thread forms.

Key Features

• Solid carbide construction with PVD TiCN/TiN coating for wear resistance
• ISCAR IC228 grade rated for universal workpiece material compatibility
• Right-hand cutting geometry for standard internal threading direction
• 20 TPI UN thread standard profile
• 3/16-inch inscribed circle, 08IR insert style for compact bore applications
• Conforms to ISO 13399 for tooling data compatibility

Compatibility

Designed for use with 08IR-style internal threading toolholders within the ISCARTHREAD series. Compatible with workpiece material groups H, K, M, N, P, and S per ISO classification. Specific toolholder compatibility should be verified against ISCAR ISCARTHREAD toolholder documentation.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the CNC turning center is fully stopped and the program is in a safe state before indexing or replacing inserts. Use the correct torque driver for the clamping screw to avoid seat damage — refer to the toolholder manufacturer specification for clamping torque. Inspect the insert pocket and seating surface for chips or debris before seating the new insert.