Vargus 53709 Threading Insert 20 Tpi Un Solid Carbide

Product Description

The VARGUS 53709 is a laydown threading insert designed for right-hand internal UN thread cutting at 20 threads per inch (TPI). Built from solid carbide with a TiAlN coating applied via PVD process, this insert delivers consistent thread form geometry in a wide range of workpiece materials. The 3JIR insert style features a 9.53 mm inscribed circle, 3.60 mm thickness, and a 60-degree included angle with SCB chipbreaker geometry. It is intended for CNC lathe and turning center applications where precise, repeatable internal threading is required. Machinists and tooling technicians working in production or job-shop environments will find this insert suited to demanding threading operations.

This insert is used for cutting UN-standard internal threads per ANSI B1.1:74 on a variety of workpiece materials. The primary workpiece material codes cover a broad range including steel, stainless steel, cast iron, non-ferrous metals, high-temperature alloys, and universal applications. It fits standard 3JIR toolholders and is appropriate for both production threading and single-pass finishing operations on internal thread forms in residential and industrial machining environments.

Key Features

• Solid carbide construction with TiAlN PVD coating for wear resistance across multiple material groups
• Right-hand internal UN thread form at 20 TPI with 60-degree included angle
• 3JIR insert style with 9.53 mm (3/8 inch) inscribed circle
• SCB chipbreaker geometry for controlled chip evacuation in internal bores
• Conforms to ANSI B1.1:74 thread standard and manufactured under ISO 9001:2008 quality system
• Compatible with universal workpiece material groups: H, K, M, N, P, S

Compatibility

Designed as an OEM-style replacement insert for 3JIR-series internal threading toolholders accepting a 3/8-inch inscribed circle laydown insert with 20 TPI UN thread geometry.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the toolholder is secured before seating or replacing the insert. Verify insert orientation matches the right-hand cutting direction of the toolholder before clamping. Follow toolholder manufacturer torque guidelines for the clamping screw to avoid insert damage.