Vargus 51609 Laydown Threading Insert 3ER 24 Tpi Unj

Product Description

The VARGUS 51609 is a solid carbide laydown threading insert designed for external UNJ thread profiles at 24 threads per inch. Built to the 3ER insert style with a 3/8-inch (9.53 mm) inscribed circle and a thickness of 3.6 mm, this insert delivers precise, repeatable thread geometry on a wide range of workpiece materials. The TiAlN coating is applied via PVD process, providing thermal resistance and extended tool life under demanding cutting conditions. It carries a 60-degree included angle and a single tooth per side configuration. Machinists and CNC turning specialists working in aerospace, defense, and precision machining environments will find this insert meets both ISO 9001:2008 and MIL-S-8879C standards.

This insert is suited for right-hand external threading operations on lathes and turning centers where UNJ thread profiles are required. The UNJ standard specifies a controlled root radius, making it a common specification in aerospace fastener and structural applications governed by MIL-S-8879C. The universal primary workpiece material classification covers a broad material range including carbon steels, stainless steels, cast irons, non-ferrous alloys, high-temp alloys, and titanium alloys, indicated by material codes H, K, M, N, P, and S.

Key Features

• Solid carbide substrate with PVD-applied TiAlN coating for high-temperature wear resistance
• 3ER insert style, 24 TPI, 60-degree included angle for UNJ external thread profile
• 3/8-inch inscribed circle (9.53 mm) and 3.6 mm thickness for standard laydown toolholders
• Right-hand cutting configuration
• Compliant with ISO 9001:2008 and MIL-S-8879C standards
• Compatible with universal workpiece materials: H, K, M, N, P, and S material groups

Compatibility

Designed for use in laydown threading toolholders accepting 3ER-style inserts with a 3/8-inch inscribed circle. Suitable for external UNJ threading applications across the broad material groups designated H, K, M, N, P, and S.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or removing the insert. Ensure the insert pocket and clamping surfaces are clean and free of chips before installation. Do not exceed the toolholder manufacturer's recommended clamping torque for this insert size.