K487-25 - Lincoln Magnum SG Aluminum Spool Gun 250A 25ft

Precision Aluminum Welding Solution

The Lincoln Electric Magnum SG Spool Gun (K487-25) is a high-performance semi-automatic wire feeder gun designed specifically to address the challenges of welding aluminum. Unlike standard MIG guns that push soft aluminum wire through long liners—often resulting in bird-nesting and erratic feeding—the Magnum SG mounts a 4-inch wire spool directly on the gun. This short travel distance ensures smooth, consistent delivery of wire to the arc, making it an essential tool for fabrication shops, automotive repair, and marine applications. Rated at 250 amps at a 60% duty cycle, this air-cooled unit provides the power necessary for light to medium-duty industrial projects.

Ergonomic Design and Remote Control

Operator comfort and efficiency are at the forefront of the Magnum SG's design. The gun is lightweight and well-balanced, minimizing wrist strain during long welding sessions. A large, easy-grip handle and a sizable trigger allow for precise manipulation even when wearing heavy protective gloves. One of the standout features is the remote wire speed control dial integrated directly into the handle. This innovation allows the welder to fine-tune the wire feed speed at the workpiece without having to walk back to the power source, which is particularly advantageous when utilizing the full extension of the 25-foot (7.5 m) cable assembly.

Durability and Visibility

Lincoln Electric has engineered the Magnum SG for the rigors of the workshop. The unit features a clear spool gun body cover, providing a direct view of the wire drive path for quick inspection and troubleshooting. Similarly, a clear electrode wire spool cover allows the operator to check the remaining wire supply at a glance, preventing unexpected interruptions. The gas nozzle is constructed from durable materials to resist heat and impact. Compatible with wire diameters ranging from .023" to 3/64", the Magnum SG is a versatile addition to any professional welder's arsenal, compatible with a wide range of CV power sources and engine-driven welders.