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

Tweco 10401104 Classic No. 4 MIG Gun - 400A, 20ft

The Tweco Classic No. 4 MIG Gun (Part Number 10401104) is a high-performance, air-cooled welding torch designed for professional welders who demand reliability and power. Rated for 400 Amps, this gun is engineered to handle the heat of high-deposition welding processes, including GMAW (MIG) and FCAW (Flux-Cored). This specific assembly features a 20-foot (6.1 meter) cable, providing exceptional reach for working on large weldments, trailers, and structural components.

Technical Specifications & Performance

The Classic No. 4 is built around a heavy-duty coaxial cable that ensures optimal current transfer and shielding gas flow. The gun is rated at 400 Amps at a 60% duty cycle with CO2 gas, or 300 Amps at 60% duty cycle with mixed gases. It comes set up for .035" to .045" (0.9mm - 1.2mm) wire diameters, covering the most common range for industrial fabrication. The backend connection is a standard Tweco style, ensuring plug-and-play compatibility with Lincoln, Miller, ESAB, and other feeders equipped with Tweco adapters.

Consumables & Maintenance

Maintenance is streamlined thanks to the use of standard Tweco consumables, which are the most widely used in the industry. The front-end parts include:

• Contact Tips: Uses 14-Series tips (e.g., 14-35, 14-45).
• Nozzles: Compatible with 24-Series slip-on nozzles (e.g., 24A-62).
• Diffusers: Uses 54A gas diffusers.
• Liners: Uses 44-Series liners tailored to the wire size and cable length.

The gun features a 60-degree conductor tube (gooseneck) which provides a comfortable working angle for most flat and horizontal welding positions. The metal-jacketed conductor tube is insulated to prevent electrical shorts and is swiveling in some configurations to reduce wrist strain. The trigger switch is a heavy-duty mechanical type, designed for millions of cycles. If you need a MIG gun that can survive the rigors of a shipyard or a heavy fab shop while delivering consistent arc performance, the Tweco Classic No. 4 is the proven choice.