8-4014 - Tweco 4A-70 Conductor Tube for No. 4 MIG Guns

Reliable Replacement for Industrial MIG Systems

The Tweco 8-4014 (4A-70) Torch Head Main Body is an essential replacement component designed to maintain the high-performance standards of Tweco No. 4 series MIG guns. In heavy industrial environments, the conductor tube (or gooseneck) is subjected to intense heat, spatter, and mechanical stress. Over time, this can lead to degraded electrical conductivity or gas flow issues. The 4A-70 body is engineered to restore your equipment to factory specifications, ensuring that your welding operations continue without interruption.

This specific model features a 70-degree bend angle, which is the standard configuration for general-purpose fabrication. The angle is carefully calculated to provide the welder with a comfortable hand position while maintaining excellent visibility of the weld puddle. Whether you are welding in flat, horizontal, or vertical positions, the 70-degree neck allows for natural wrist movement, reducing operator fatigue during long shifts.

Constructed from high-grade copper and brass alloys, the Tweco 8-4014 ensures superior thermal and electrical conductivity. Efficient heat dissipation is critical for air-cooled guns like the No. 4 series (rated at 400 Amps), preventing the handle from becoming uncomfortably hot. The robust outer insulation protects the component from short circuits against the workpiece, enhancing safety and durability. Compatible with standard Tweco consumables—including diffusers, nozzles, and contact tips—this torch head integrates seamlessly into your existing inventory of spare parts.

Key Benefits for Industrial Users:

• Exact Fit: Designed precisely for the Tweco No. 4 platform, eliminating compatibility guesswork.


• Durability: Built to withstand the rigors of structural steel, heavy manufacturing, and shipyard environments.


• Performance: Maintains stable arc characteristics and smooth wire feeding by replacing worn or bent tubes.