KP2743-2-62R - Lincoln Magnum PRO 550A Slip-On Nozzle, 5/8" Bore, 1/8" Recess

High-Performance Consumable for Industrial Fabrication

The Lincoln Electric KP2743-2-62R is a premium gas nozzle engineered specifically for the Magnum PRO series of MIG welding guns. Designed to withstand the rigors of high-amperage industrial welding, this nozzle is rated for applications up to 550 amps. It features a robust construction utilizing high-quality copper alloy materials which provide excellent thermal conductivity, ensuring that heat is effectively dissipated away from the front end of the gun. This thermal management is critical for maintaining the structural integrity of the nozzle and preventing premature failure during long weld cycles.

The nozzle utilizes a slip-on connection mechanism, a significant improvement over traditional threaded designs. This feature allows operators to remove and replace the nozzle quickly and easily, often without the need for hand tools, thereby reducing downtime during maintenance or contact tip changes. The internal geometry is precision-machined to a 5/8 inch (15.9 mm) inner diameter, a standard size that balances gas flow velocity and coverage area, making it suitable for a wide range of wire diameters and transfer modes, including spray transfer and pulsed MIG.

A key specification of the KP2743-2-62R is its 1/8 inch (3.2 mm) contact tip recess. By positioning the contact tip slightly back from the nozzle edge, the design offers enhanced protection against spatter accumulation and radiant heat, which can degrade the tip's conductivity. This recess also assists in maintaining a consistent electrical stick-out (ESO), which is vital for arc stability. As part of the Magnum PRO system, this nozzle integrates seamlessly with Lincoln Electric's diffusers and insulators, ensuring a tight gas seal and consistent shielding gas delivery to the weld pool.

This component is essential for fabrication shops utilizing Lincoln Magnum PRO 250L, 350, 450, and 550 guns, as well as compatible robotic torch systems. Its durability and design efficiency make it a cost-effective choice for high-volume manufacturing environments.