Vargus 51588 Laydown Threading Insert 3ER20UN Vkx 20 Tpi

Product Description

The VARGUS 51588 is a solid carbide laydown threading insert designed for right-hand external UN thread cutting at 20 threads per inch. It carries the VKX manufacturer grade with a TiN coating applied via PVD process, delivering wear resistance suited for threading operations across a broad range of workpiece materials. The 3ER insert style features a 3/8-inch inscribed circle and a 60-degree included angle conforming to the UN thread profile. Licensed machinists and CNC lathe operators use this insert for high-precision external threading on production and job-shop turning centers.

This insert is suited for external threading on universal workpiece materials, covering ferrous, non-ferrous, stainless, heat-resistant alloys, and cast materials as indicated by material codes H, K, M, N, P, and S. It fits standard 3ER toolholders and is appropriate for both general-purpose and high-volume external thread turning in the 20 TPI UN class. Applications span aerospace, automotive, and general industrial manufacturing where consistent UN thread form accuracy is required.

Key Features

• Solid carbide substrate with VKX grade for extended tool life in threading applications
• TiN coating applied by PVD process for surface hardness and reduced friction
• Right-hand external UN thread form at 20 TPI with 60-degree included angle
• 3/8-inch inscribed circle in 3ER insert style for use with standard laydown toolholders
• Universal material compatibility covering steel, stainless, cast iron, non-ferrous, and heat-resistant alloys
• Conforms to ANSI B1.1:74 UN thread standard and manufactured under ISO 9001:2008 quality system

Compatibility

Designed for use with standard 3ER laydown threading toolholders. Compatible with workpiece material groups H, K, M, N, P, and S as specified by the manufacturer. Suitable for UN external thread applications at 20 TPI per ANSI B1.1:74.

Installation Notes

Installation and indexing should be performed by a qualified machinist or CNC setup technician with the machine powered down and the spindle locked. Ensure the toolholder pocket and clamping screw are clean and free of chips before seating the insert. Follow the toolholder manufacturer torque guidance for the clamping screw. Verify thread pitch and form with a thread gauge after the first pass before committing to a full production run.