KP2879-4 - Magnum PRO 250LX Barrel Liner .025-3/64 Inch

Lincoln Electric KP2879-4 Expendable Liner Overview

The Lincoln Electric KP2879-4 is a specialized expendable liner designed to ensure optimal performance for your Magnum PRO 250LX and Magnum PRO 250LX GT spool guns. In the demanding world of industrial welding, the integrity of your wire feeding path is paramount, especially when utilizing spool guns for aluminum or soft wire applications. This liner is engineered to fit precisely within the 45-degree and 60-degree barrel assemblies of the specified Magnum PRO models, providing a smooth, low-friction conduit for welding wire.

Technical Precision and Compatibility

Rated for up to 550 amps, this liner is built to withstand the heat and electrical current associated with heavy-duty welding cycles. It accommodates a wire diameter range of .025 inches to 3/64 inches, covering the most common sizes used in spool gun applications. The liner acts as a critical interface between the wire drive and the contact tip, navigating the curvature of the gun barrel. By maintaining a consistent internal diameter through the bend, it prevents wire shaving, micro-arcing inside the barrel, and erratic feeding speeds that can lead to burn-back.

Maintenance and Performance

Regular replacement of the barrel liner is essential for maintaining weld quality. Over time, liners can accumulate debris, copper dust, or become deformed due to heat and mechanical stress. A compromised liner often manifests as unstable arc starts or "chatter" in the wire feed. The KP2879-4 is designed as an expendable part, meaning it is intended for easy removal and replacement during routine maintenance intervals. Installing a fresh liner restores the gun's feeding characteristics to factory standards, ensuring that your Magnum PRO 250LX operates at peak efficiency. Whether you are fabricating aluminum trailers, repairing signage, or performing general maintenance, this genuine Lincoln Electric component is the reliable choice for your equipment.