10401112 - Tweco Classic 4 MIG Gun 400A 12ft 1/16 Wire

The Industry Standard for Heavy-Duty MIG Welding

The Tweco Classic No. 4 MIG Gun (SKU: 10401112) represents the benchmark for air-cooled semi-automatic welding. For decades, the "Classic" series has been the preferred choice for industrial fabricators requiring a robust, reliable, and easily serviceable tool. This specific configuration is rated for 400 Amps at a 60% duty cycle using CO2 gas, making it ideal for structural steel, heavy equipment manufacturing, and general fabrication tasks where high heat and long arc-on times are common.

This model features a 12-foot cable assembly, offering a balance between reach and wire feedability. It comes equipped with a standard Tweco backend connection, ensuring compatibility with a vast range of wire feeders and power sources that utilize the Tweco style adapter. The gun is pre-configured with a liner and contact tip setup for 1/16" (1.6mm) welding wire, targeting heavy deposition applications. The Classic No. 4 utilizes the widely available Tweco 14 Series contact tips, 24 Series nozzles, and 54 Series gas diffusers, ensuring that consumables are always easy to source and cost-effective.

Engineered for longevity, the gun features a metal-jacketed conductor tube and a heavy-duty coaxial cable that resists cuts, burns, and abrasion. The air-cooled design eliminates the complexity of water coolers while maintaining high amperage capacity, providing a straightforward solution for harsh industrial environments. Whether you are upgrading existing equipment or outfitting a new welding cell, the Tweco Classic No. 4 delivers the consistent performance professionals demand.