10401104 - Tweco Classic No. 4 MIG Gun, 400 Amp, 20ft Cable, Tweco Connection

The Industry Standard: Tweco Classic No. 4 MIG Gun

When professional fabricators think of a heavy-duty, air-cooled MIG gun, the Tweco Classic No. 4 is often the first tool that comes to mind. For decades, this welding gun has set the benchmark for durability, simplicity, and performance in the harshest industrial environments. The Tweco 10401104 model is a specific configuration of this legendary series, boasting a generous 20-foot cable and a standard Tweco backend connection, making it compatible with a vast array of wire feeders found in shops across the globe.

Designed for high-amperage applications, the Classic No. 4 is rated at 400 Amps at 60% duty cycle using CO2 gas. This makes it an ideal choice for structural steel fabrication, heavy equipment repair, shipbuilding, and general manufacturing where long arc-on times are the norm. The air-cooled design eliminates the complexity of water coolers, relying instead on heavy copper conductors and robust construction to manage heat effectively. This simplicity translates to lower maintenance costs and higher reliability on the shop floor.

One of the key benefits of the Tweco Classic series is the ease of maintenance. The gun utilizes the world-renowned Tweco consumable platform. From the 14-Series contact tips to the 24-Series nozzles and 54-Series gas diffusers, replacement parts are inexpensive and available at virtually every welding supply store. The mechanical connection of the cable to the gun handle and the backend allows for field repairs, ensuring that a damaged cable doesn't necessarily mean buying a whole new gun. The handle itself is designed with an ergonomic curve that balances well in the hand, reducing operator fatigue during long welds.

This 20-foot version provides significant reach advantages over standard 10 or 12-foot guns, allowing welders to move around large assemblies without constantly repositioning the wire feeder. Whether you are running solid wire or flux-cored wire, the Tweco Classic No. 4 delivers consistent wire feeding and electrical conductivity, ensuring your welds meet the highest quality standards.