Vargus 51291 Laydown Threading Insert 3ER12UN Vtx Carbide

Product Description

The VARGUS 51291 is a solid carbide laydown threading insert designed for external UN thread cutting at 12 threads per inch. Manufactured in the 3ER insert style with a VTX grade and PVD-applied TiAlN coating, this insert delivers consistent thread form in a wide range of workpiece materials including steel, stainless, cast iron, non-ferrous alloys, and superalloys. The 60-degree included angle produces standard UN thread geometry conforming to ANSI B1.1:74. Right-hand cutting orientation and a 3.60 mm thickness make it a direct fit for compatible 3ER toolholders used in CNC turning and threading operations.

This insert is suited for external threading operations on CNC lathes and turning centers in both production and job-shop environments. The universal material compatibility designation covers ISO material groups H, K, M, N, P, and S, making it appropriate for shops working across a broad mix of workpiece materials. It is commonly used in industrial machining applications requiring precise, repeatable UN thread profiles on turned components. Machinists and CNC operators in manufacturing and machine shops are the primary installers of this insert type.

Key Features

• Solid carbide construction with VTX grade for wear resistance across universal material groups
• PVD TiAlN coating for extended tool life in demanding cutting conditions
• 12 TPI external UN thread form with 60-degree included angle per ANSI B1.1:74
• Right-hand cutting orientation in 3ER insert style
• 9.53 mm (3/8 inch) inscribed circle with 3.60 mm thickness for secure seating in 3ER holders
• Single tooth per side geometry for clean thread profile generation

Compatibility

Designed for use in 3ER-style laydown threading toolholders. Compatible with workpiece materials across ISO groups H, K, M, N, P, and S. Conforms to ANSI B1.1:74 UN thread standard.

Installation Notes

Insert replacement should be performed with the machine powered down and the spindle at a complete stop. Use the appropriate torque wrench and insert key specified by the toolholder manufacturer when seating the insert to avoid cracking the carbide substrate. Verify insert orientation and hand designation against the toolholder before engaging the cut. Inspect the insert seat and clamping components for debris or wear before installing a new insert.