KP4523-1-62S - Lincoln Electric Magnum PRO Water-Cooled MIG Nozzle, 5/8" ID, 1/8" Stickout

Technical Overview of the Lincoln Electric KP4523-1-62S

The Lincoln Electric KP4523-1-62S is a specialized gas nozzle designed for the Magnum® PRO series of semi-automatic water-cooled welding guns. Specifically engineered for the 400A and 500A models, this component plays a critical role in the thermal management and gas shielding efficiency of high-amperage MIG welding systems. The nozzle features a 5/8-inch (15.9 mm) inside diameter (ID), which provides a broad umbrella of shielding gas, essential for protecting the weld pool from atmospheric contamination during heavy fabrication tasks.

A defining characteristic of this model is its 1/8-inch (3.2 mm) stickout geometry. In the context of the Magnum PRO expendable system, the stickout refers to the relationship between the contact tip and the nozzle exit. A 1/8" stickout typically means the contact tip is recessed slightly or positioned such that the wire extends 1/8" beyond the nozzle face when at the proper electrical stickout, or it refers to the nozzle extending past the tip depending on the specific reference point of the series; however, in Magnum PRO nomenclature, specific stickout/recess options allow operators to fine-tune their arc characteristics and joint access. This nozzle is constructed to withstand the intense radiant heat generated during high-duty cycle welding, leveraging the water-cooling capabilities of the host gun to prevent overheating and premature failure.

The KP4523-1-62S integrates seamlessly with the Magnum PRO front-end parts, ensuring a tight seal against gas leaks and maintaining electrical isolation where necessary. It is manufactured to strict tolerances to ensure concentricity with the contact tip, which is vital for consistent arc performance. Industrial procurement specialists should note that this nozzle is sold individually and is a direct OEM replacement part, ensuring full compatibility with existing Lincoln Electric water-cooled setups.