Vargus 51287 3ER 12UN Vkx Solid Carbide Threading Insert

Product Description

The VARGUS 51287 is a laydown-style threading insert designed for external UN thread cutting on CNC lathes and turning centers. Built from solid carbide and finished with a PVD-applied TiN coating, it delivers consistent thread form across a wide range of workpiece materials. The 3ER insert style produces a 60-degree included angle conforming to the UN thread standard at 12 threads per inch. With a 3/8-inch inscribed circle, this insert is sized for standard toolholders in the 3ER series. It is a right-hand insert suited to conventional external threading passes on turned components.

This insert is intended for external threading operations on materials spanning multiple workpiece categories, including steel, stainless steel, cast iron, non-ferrous alloys, high-temperature alloys, and general-purpose stock. It is a production-grade tool for shops running high-mix or high-volume turning work where thread quality and tool life consistency are critical. Machinists and CNC turning technicians are the primary users. The insert meets ANSI B1.1:74 thread standards and is manufactured under ISO 9001:2008 quality guidelines.

Key Features

• Solid carbide substrate with PVD TiN coating for wear resistance across diverse workpiece materials
• 3ER laydown insert style fits standard 3ER series external threading toolholders
• 60-degree included angle produces correct UN thread form per ANSI B1.1:74
• 12 TPI pitch for right-hand external UN thread cutting
• 3/8-inch inscribed circle for accurate, repeatable seating in the pocket
• Universal primary workpiece material rating - suitable for steel, stainless, cast iron, non-ferrous, and superalloys

Compatibility

Designed as an OEM-style replacement insert for external threading toolholders accepting the 3ER insert style, used in conventional and CNC turning applications requiring UN 12 TPI thread forms.

Installation Notes

Insert seating and clamping should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and the toolholder is secured before changing inserts. Seat the insert fully in the pocket and torque the clamping screw according to the toolholder manufacturer specification. Inspect the insert edge and coating condition before each run to confirm there is no chipping or wear that would affect thread form accuracy.