KP3161-1-62R - Lincoln Magnum PRO 550A Thread-On Bottleneck Nozzle 5/8 ID

Lincoln Electric KP3161-1-62R Magnum PRO 550A MIG Nozzle

The Lincoln Electric KP3161-1-62R is a premium-grade gas nozzle designed specifically for the Magnum PRO 550A series of MIG welding guns. Engineered for high-performance industrial environments, this consumable plays a critical role in shielding gas coverage and thermal management at the front end of the torch. With a robust 550-amp rating, it is built to withstand the intense heat and duty cycles associated with heavy fabrication, structural steel, and manufacturing applications. The nozzle is manufactured to strict tolerances to ensure compatibility and performance within the Lincoln Electric Magnum PRO ecosystem.

This nozzle features a specialized "bottleneck" geometry. Unlike standard cylindrical nozzles, the bottleneck design tapers towards the outlet, significantly improving operator visibility of the weld puddle and arc. This profile also facilitates access into tighter joints and corners where a wider nozzle might be obstructed. The bore diameter is precision-machined to 5/8 inch (15.9 mm), providing an optimal balance of gas flow velocity and coverage area for standard wire sizes ranging from .035 to 1/8 inch. This ensures that the weld pool remains protected from atmospheric contamination, reducing porosity and rework.

A key feature of the KP3161-1-62R is its thread-on connection mechanism. Designed to mate exclusively with 550A thread-on gas diffusers, this system ensures a secure, concentric fit that maintains precise contact tip alignment. The threaded interface also promotes superior heat transfer away from the front end, helping to extend the service life of both the nozzle and the internal consumables. The nozzle provides a 1/8 inch (3.2 mm) tip recess, which positions the contact tip slightly back from the nozzle edge. This recess offers protection against spatter bridging and electrical shorts, particularly when welding at higher parameters or in overhead positions.

Part of the Magnum PRO expendables line, this nozzle benefits from Lincoln's focus on durability and reduced downtime. The single-piece construction is robust and resistant to deformation under thermal stress. By maintaining a cool front end, the nozzle minimizes spatter adhesion, making it easier to clean and maintain during long shifts. It is an essential component for operators utilizing Magnum PRO 550A guns who require consistent shielding gas performance and reliable arc stability in demanding industrial settings.