10401924 - Tweco Classic 4 MIG Gun, 400A, 25ft, Miller Connection

Tweco Classic No.4 MIG Gun – 400A, 25ft, Miller Connection

The Tweco Classic No.4 MIG Gun is a legend in the welding industry, renowned for its rugged durability and high-performance capabilities in heavy industrial environments. This specific configuration (SKU: 1040-1924) is engineered for welders who require exceptional reach and power. Rated at 400 Amps at 60% duty cycle, this air-cooled gun is built to handle high-amperage applications such as structural steel fabrication, heavy equipment manufacturing, and shipbuilding.

What sets this model apart is its 25-foot cable length. Standard MIG guns typically max out at 15 feet to prevent wire feeding issues, but this specialized assembly is designed to allow operators to weld at significant distances from the power source. This is particularly advantageous in large bays or when working on large vessels where moving the wire feeder is impractical. Due to the length, this gun is best suited for stiffer, larger diameter wires (such as 1/16" flux-cored or solid steel) to ensure smooth feedability.

The gun features a Miller-style backend connection, making it a direct plug-and-play replacement for Miller wire feeders and power sources. It utilizes Tweco’s industry-standard consumables, including the robust 14-series contact tips and 24-series nozzles, ensuring that replacement parts are easy to find and affordable. The handle is the traditional Classic No.4 design—ergonomic, impact-resistant, and favored by veteran welders for its balance and feel. Whether you are running flux-cored wire or solid MIG wire, the Tweco Classic No.4 delivers consistent arc stability and thermal management.

Key Benefits:

• Extended Reach: 25-foot cable allows for welding in hard-to-reach areas without relocating equipment.


• High Output: 400A rating handles thick plate welding with ease.


• Compatibility: Direct connection for Miller feeders eliminates the need for adapters.


• Durability: Heavy-duty construction withstands drops, heat, and harsh shop environments.