Vargus 51621 3ER24UN Vkx Threading Insert Solid Carbide Tin

Product Description

The VARGUS 51621 is a solid carbide laydown threading insert designed for right-hand external UN thread cutting at 24 threads per inch (TPI). Manufactured in the 3ER insert style with a 3/8-inch inscribed circle, this insert carries the VKX grade designation and features a PVD-applied titanium nitride (TiN) coating for extended wear resistance. The 60-degree included angle matches the standard UN thread form per ANSI B1.1:74. Machinists and toolroom operators use this insert in CNC lathes and manual turning centers where consistent, repeatable thread profiles are required on external workpiece diameters.

This insert is suited for threading operations across a broad range of workpiece materials. The VKX grade with TiN coating supports universal application, covering material groups including steel, stainless steel, cast iron, nonferrous metals, high-temperature alloys, and aluminum. It is appropriate for production environments handling both prototype and high-volume external UN threaded components in 24 TPI configurations.

Key Features

• Solid carbide substrate with PVD TiN coating for extended tool life
• 3ER insert style, size code 3, with 3/8-inch inscribed circle
• Right-hand external UN thread form at 24 TPI, 60-degree included angle
• VKX manufacturer grade rated for universal workpiece material compatibility
• Conforms to ANSI B1.1:74 thread standard and manufactured under ISO 9001:2008 quality system
• Standard series laydown geometry for drop-in compatibility with common 3ER toolholders

Compatibility

Designed as a replacement-style threading insert for standard 3ER insert toolholders requiring a right-hand external UN thread insert at 24 TPI with a 3/8-inch inscribed circle.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the toolholder is secured before seating or indexing the insert. Use the correct torque wrench and insert screw specified by the toolholder manufacturer to avoid cracking the carbide substrate. Verify thread pitch and insert orientation against the workpiece drawing before commencing the threading cycle.