Vargus 51695 3ER 28UN Vkx Threading Insert Solid Carbide

Product Description

The VARGUS 51695 is a laydown-style threading insert designed for external UN thread cutting operations. Manufactured from solid carbide with a PVD-applied TiN coating, this insert delivers consistent thread form and extended cutting life across a broad range of workpiece materials. It is configured for right-hand external threading at 28 threads per inch (TPI) with a 60-degree included angle conforming to the UN thread standard. The 3ER insert style fits standard laydown threading toolholders and features a 3/8-inch inscribed circle (IC). Machinists and CNC turning specialists rely on inserts of this type for precision thread-cutting in production and job-shop environments.

This insert is suited for threading on CNC lathes and manual turning centers where UN external threads at 28 TPI are required. The VKX grade with TiN coating makes it compatible with a wide range of workpiece materials including carbon steel, stainless steel, cast iron, aluminum, titanium, and heat-resistant alloys. It is appropriate for both production threading runs and maintenance or repair threading applications where precise UN thread form is critical.

Key Features

• Solid carbide substrate with PVD TiN coating for wear resistance and extended tool life
• 3ER laydown insert style for use in standard external threading toolholders
• 28 TPI external UN thread profile with 60-degree included angle per ANSI B1.1:74
• 3/8-inch inscribed circle (IC) for precise seating and repeatable thread geometry
• Universal workpiece material compatibility including steel, stainless, aluminum, cast iron, titanium, and high-temperature alloys
• Right-hand cut configuration for standard external threading direction

Compatibility

Designed as an OEM-style replacement laydown threading insert for standard 3ER external threading toolholders. Specific toolholder compatibility should be verified against the toolholder manufacturer's insert specification chart prior to installation.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and all motion is locked out before indexing or replacing the insert. Use the appropriate torx or hex key as specified by the toolholder manufacturer to secure the clamping screw to the correct seating torque - do not overtighten. Verify insert seating and thread pitch with a thread gauge before resuming production to confirm correct UN thread form.