KP2743-1-75F-B25 - Lincoln Magnum PRO 550A Flush MIG Nozzle 3/4 Inch Thread-On (25 Pack)

Industrial Grade Shielding for High-Amperage Welding

The Lincoln Electric KP2743-1-75F-B25 Magnum PRO Nozzle is a premium consumable component engineered to meet the rigorous demands of heavy industrial welding. Designed for use with the Magnum PRO series of semi-automatic MIG guns, this nozzle is rated for a substantial 550 amps. This high amperage rating makes it the ideal choice for fabrication environments where heat input is intense and duty cycles are demanding, such as in structural steel erection, shipbuilding, and heavy equipment manufacturing. The nozzle plays a critical role in directing shielding gas over the weld pool, and its robust construction ensures consistent performance even under extreme thermal stress.

Featuring a large 3/4 inch (19 mm) inner diameter, this nozzle is optimized for high-deposition welding processes. The wide bore allows for a voluminous flow of shielding gas, which is essential for protecting large weld puddles from atmospheric contamination. Inadequate gas coverage can lead to porosity and compromised weld integrity, but the generous opening of the KP2743-1-75F ensures a laminar flow that effectively displaces nitrogen and oxygen. The flush tip design aligns the nozzle exit with the contact tip, a configuration that many professional welders prefer for its balance of arc visibility and gas shielding efficiency. It allows for easy monitoring of the arc while maintaining a standard electrical stick-out.

One of the key advantages of the Magnum PRO system is the secure thread-on connection. Unlike friction-fit or slip-on nozzles that can loosen due to thermal expansion and contraction, the thread-on design maintains a tight mechanical seal and ensures perfect concentricity with the contact tip. This stability prevents the nozzle from wandering or falling off during operation, particularly in overhead or vertical positions. Additionally, the high-quality copper alloy material is engineered to resist spatter adhesion, making it easier to clean and extending the operational life of the consumable.

Supplied in a bulk package of 25, the KP2743-1-75F-B25 is tailored for high-volume operations that require a steady supply of reliable expendables. Managing inventory is simplified with this larger pack size, reducing the frequency of reordering and ensuring that welding stations remain productive. By choosing genuine Lincoln Electric consumables, you are investing in the longevity of your welding guns and the quality of your final product. These nozzles deliver the consistency and durability required to maintain peak efficiency in the most challenging welding environments.