KP2745-18-B100 - Lincoln Magnum PRO 550A Contact Tip 1/8 Inch (100 Pack)

High-Performance Magnum PRO Copper Plus Tips

For professional welders operating high-amperage equipment, the contact tip is the critical point of power transfer. The Lincoln Electric KP2745-18-B100 Copper Plus® Contact Tip is engineered to withstand the rigors of 550A welding while maintaining precise electrical contact. Designed for use with 1/8 inch (3.2 mm) wire, this tip is built for the heavy jobs—thick plate fabrication, structural beam welding, and other applications requiring substantial deposition rates.

The defining feature of this consumable is the Copper Plus® alloy and design. Unlike standard tips that can soften and deform under the intense heat of a 550A arc, Copper Plus tips possess a larger mass and superior thermal properties. This allows for more efficient heat dissipation, keeping the tip cooler and preventing the wire from fusing to the bore (burnback) or the tip from fusing to the diffuser. The result is a contact tip that lasts longer, maintains a stable arc, and reduces the frustration of constant replacements.

Mechanically, the Magnum PRO tips feature a flattened thread profile. This innovation serves two purposes: it increases the surface area for electrical conductivity between the diffuser and the tip, and it acts as an anti-seize mechanism. Even after hours of welding at high amperages, the tip resists seizing, making changeovers quick and tool-friendly. The 1.5-inch (38 mm) length is standard for the 550A Magnum PRO setup, ensuring proper nozzle stick-out and gas coverage geometry.

This 100-pack ensures you have a ready supply of fresh tips. When welding with 1/8" wire, micro-arcing inside the tip can degrade performance over time. Having a fresh Copper Plus tip on hand ensures you can maintain the highest quality weld bead without fighting your equipment. Upgrade your front-end consumables to Lincoln's Magnum PRO standard and experience the difference in arc stability and part life.