KP3359-1-50R - Lincoln Electric Magnum PRO 350A Extended Reach MIG Nozzle, 1/2" Bore, 1/8" Recess

Technical Overview of the Lincoln Electric KP3359-1-50R

The Lincoln Electric KP3359-1-50R is a specialized gas nozzle engineered for the Magnum® PRO series of semi-automatic MIG welding guns. This component is rated for 350 amps, making it suitable for medium to heavy-duty industrial fabrication environments. The nozzle features a 1/2-inch (12.7 mm) inner bore diameter and a 1/8-inch (3.2 mm) contact tip recess. The recessed tip configuration is essential for protecting the contact tip from radiant heat and short-circuit spatter, while also assisting in the laminar flow of shielding gas over the weld pool.

A distinguishing technical characteristic of this nozzle is its "Extended Reach" form factor. It provides an additional 1.5 inches of length compared to standard flush or recessed nozzles. This geometric extension is critical for applications involving deep groove welds, complex structural nodes, or restricted access areas where the gun handle would otherwise interfere with the workpiece. By extending the gas outlet, the nozzle allows the contact tip to reach the root of the joint without compromising the gas shield.

Material construction includes a high-quality copper alloy base for thermal conductivity, finished with a robust nickel plating. The nickel plating serves two primary functions: it reflects radiant heat from the arc to reduce the operating temperature of the front-end consumables, and it provides a low-surface-energy barrier that resists the adhesion of molten spatter. This ensures that the nozzle remains clear of obstructions for longer periods, reducing downtime associated with cleaning. The nozzle utilizes coarse threads for attachment to the diffuser, a design choice that mitigates the risk of cross-threading and seizing due to thermal expansion and contraction cycles. It is compatible with wire diameters ranging from .035" to 5/64" and fits Magnum® PRO Curve™ 200, 250, 350, 450, and 550 models.