Vargus 51494 Threading Insert 3ER 18 Tpi Unj Solid Carbide

Product Description

The VARGUS 51494 is a solid carbide laydown threading insert designed for external UNJ thread forms at 18 threads per inch. Finished with a PVD-applied TiN coating, this right-hand insert provides wear resistance and edge integrity across a broad range of workpiece materials. The 3ER insert style features a 60-degree included angle and a 3/8-inch inscribed circle, making it a standard geometry for external threading operations on CNC lathes and turning centers. It is installed and changed by machinists and toolroom technicians working in precision and production threading applications.

This insert is suited for external threading operations across multiple material categories, including ferrous and non-ferrous metals, stainless, titanium alloys, and heat-resistant superalloys. The UNJ thread standard is commonly specified in aerospace and defense applications where radius root threads are required per MIL-S-8879C. The universal primary workpiece material rating makes this insert viable across varied production environments, from job shops to dedicated aerospace component manufacturing.

Key Features

• Solid carbide substrate for high rigidity and precise thread form control
• PVD TiN coating improves wear resistance and surface finish on threaded workpieces
• 60-degree included angle, 3ER style, right-hand cutting direction
• 18 TPI external UNJ thread form per MIL-S-8879C
• 3/8-inch inscribed circle fits standard 3ER toolholders
• Compatible with primary workpiece material codes H, K, M, N, P, and S

Compatibility

Designed for use in standard 3ER external threading toolholders. Compatible with workpiece material groups H, K, M, N, P, and S as specified in the supplier data. Meets ISO 9001:2008 and MIL-S-8879C standards.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's torque and clamping specifications. Power down and lock out the machine spindle before changing inserts. Inspect the insert pocket and clamping screw for debris or wear before seating a new insert. Do not mix insert styles or thread forms within the same toolholder setup.