Vargus 021-07090 Threading Insert 20 Tpi 3/8 in Ic Un

Product Description

The VARGUS 021-07090 is a solid carbide laydown threading insert designed for external UN thread cutting at 20 threads per inch (TPI). Built to the 3ER insert style with a 3/8 inch inscribed circle and a 60-degree included angle, it is coated with an AlTiN finish applied via PVD process for extended tool life across a wide range of workpiece materials. At 3.60 mm thick, this right-hand insert seats in compatible laydown threading toolholders and is suited for CNC lathe operations on both light and production thread turning. Machinists and toolroom operators running external UN threads on mixed-material jobs are the primary users of this insert.

This insert is rated for universal primary workpiece material compatibility, covering material codes H, K, M, N, P, and S. That range includes steels, stainless steels, cast irons, non-ferrous metals, and high-temperature alloys. It is well suited for general-purpose threading on CNC turning centers producing external UN threads to ANSI B1.1:74 standards. The VRX manufacturer grade designation indicates a high-performance PVD-coated carbide substrate engineered for consistent thread form and edge integrity across varied material conditions.

Key Features

• Solid carbide substrate with AlTiN PVD coating for heat and wear resistance
• 20 TPI external UN thread form, conforming to ANSI B1.1:74
• 3/8 inch inscribed circle, 3ER insert style for laydown toolholder compatibility
• 60-degree included angle for standard UN thread profile
• Right-hand cut orientation for conventional external threading operations
• Universal material grade covering steels, stainless, cast iron, non-ferrous, and superalloys

Compatibility

Designed as an OEM-style replacement threading insert for laydown-style external threading toolholders accepting the 3ER insert style with a 3/8 inch inscribed circle.

Installation Notes

Installation is performed by qualified machinists or CNC toolroom personnel. Before indexing or replacing inserts, ensure the machine spindle is fully stopped and the toolholder is secured in the turret. Use the appropriate torx or clamping screw driver specified by the toolholder manufacturer to achieve proper clamping force without overtightening. Verify insert seating and thread form with a thread gauge after the first pass before committing to full production runs.