10401126 - Tweco Classic 4 MIG Gun, 400A, 20ft, Miller Backend

Heavy-Duty Industrial MIG Welding Gun

The Tweco Classic No. 4 MIG Gun (SKU: 1040-1126) is a premier choice for professional fabricators requiring a robust, air-cooled welding torch. Rated at 400 Amps with a 60% duty cycle using CO2 gas, this gun is engineered to handle high-volume production environments and structural steel fabrication. This specific configuration features a direct Miller-style rear connection, ensuring seamless integration with compatible Miller wire feeders and power sources without the need for additional adapters.

The assembly includes a 20-foot cable, providing significant reach for working on large weldments or in situations where the power source cannot be moved close to the workpiece. The cable is constructed with high-quality copper stranding and a durable outer jacket that resists cuts, abrasion, and heat. The gun comes pre-configured for wire diameters ranging from 0.035 inches to 0.045 inches, making it versatile for standard mild steel and stainless steel applications.

Maintenance and consumable replacement are straightforward with the Classic No. 4. It utilizes the industry-standard Tweco 14 Series contact tips, 24 Series gas nozzles, and 54 Series gas diffusers. These consumables are widely available and cost-effective, reducing long-term operational costs. The handle is ergonomically designed to reduce operator fatigue during long shifts, while the heavy-duty trigger switch is tested for millions of cycles. For industrial MRO and fabrication shops looking for reliability and proven performance, the Tweco Classic No. 4 remains the gold standard.