KP2743-1-62S-B25 - Lincoln Magnum PRO 550A MIG Nozzle, 5/8" ID, 1/8" Stickout, Thread-on (25-Pack)

High-Performance Lincoln Electric Magnum PRO Nozzle

The Lincoln Electric KP2743-1-62S-B25 is a premium gas nozzle designed specifically for the Magnum PRO series of semi-automatic welding guns. Engineered to meet the rigorous demands of industrial welding environments, this nozzle is rated for high-amperage applications up to 550 amps. It features a substantial 5/8-inch (15.9 mm) inner diameter, ensuring broad and consistent shielding gas coverage over the weld pool, which is critical for maintaining weld quality and preventing porosity in heavy-duty fabrication tasks.

One of the defining characteristics of this nozzle is its 1/8-inch (3.2 mm) stickout geometry. This design allows the contact tip to protrude slightly beyond the nozzle face, providing better visibility of the arc and wire placement, particularly in tight joints or when specific arc characteristics are required. The thread-on connection mechanism ensures a secure fit to the diffuser, maximizing electrical conductivity and thermal transfer while preventing the nozzle from becoming loose during operation due to thermal expansion or vibration.

Manufactured with Lincoln Electric's proprietary copper alloy, these nozzles are built to withstand extreme heat and resist spatter adhesion. This durability translates to longer service life and reduced downtime for consumable changes. The "B25" in the part number indicates a bulk package of 25 units, making this SKU an ideal choice for high-volume manufacturing facilities looking to optimize inventory management and reduce per-unit costs. By maintaining a steady supply of fresh nozzles, operators can ensure consistent gas flow and arc stability across shifts.

Optimized for the Magnum PRO platform, the KP2743-1-62S integrates seamlessly with Lincoln's Copper Plus contact tips and diffusers. This system approach helps keep the front end of the gun cooler, extending the life of all consumables in the stack. Whether welding structural steel, heavy machinery, or pressure vessels, this 550A nozzle delivers the reliability professional welders expect from Lincoln Electric.