10401900 - Tweco Classic 4 MIG Gun, 400A, 15ft, Tweco Connection, 1/16 Wire

The Industry Standard: Tweco Classic No. 4 MIG Gun

The Tweco Classic No. 4 MIG Gun (SKU: 10401900) is widely recognized as the standard of the industry for heavy-duty air-cooled welding. Designed for professional welders who demand reliability and performance, this gun is rated at 400 Amps at a 60% duty cycle, making it capable of handling rigorous industrial applications. The Classic No. 4 has been a staple in fabrication shops, shipyards, and manufacturing plants for decades due to its robust construction and ease of service.

This specific configuration features a 15-foot cable assembly, providing ample reach for working around large assemblies or fixtures. 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 factory setup for 1/16-inch (1.6mm) welding wire, ideal for heavy structural steel welding and high-deposition applications.

Maintenance is straightforward with the Classic No. 4. It utilizes the legendary Tweco 14 Series contact tips, 24 Series gas nozzles, and 54 Series gas diffusers—consumables that are available virtually everywhere. The metal-jacketed conductor tube and heavy-duty handle are built to withstand drops, heat, and the general abuse of a welding environment. Whether you are welding thick plate or performing production fabrication, the Tweco Classic No. 4 delivers consistent arc performance and wire feeding.

Key Features:

• High Amperage: 400A rating allows for high-heat input welding without overheating.
• Durable Construction: Built with high-quality copper and impact-resistant materials.
• Easy Maintenance: Simple design allows for quick liner and consumable changes.
• Ergonomic: The classic handle shape provides a secure grip for all-day welding.