10401115 - Tweco Classic 4 MIG Gun, 400A, 25ft, 1/16 Wire, Tweco Backend

The Legend Returns: Tweco Classic No. 4 MIG Gun

For decades, professional welders have reached for the Tweco Classic No. 4 when the job calls for serious heat and reliability. This isn't just a welding gun; it's a tool built for the tradesman who demands performance. The Tweco 10401115 model brings you the robust 400-amp power you expect, paired with an extended 25-foot cable assembly that gives you the freedom to move around your workpiece. Whether you are climbing over a chassis or reaching across a large jig, the extra length ensures you aren't tethered too tightly to your machine.

What sets the Classic No. 4 apart is its feel. The patented oval handle shape fits naturally in the gloved hand, providing superior ergonomic control compared to modern "ergonomic" designs that often feel bulky. This handle shape helps you maintain the correct gun angle effortlessly, leading to better weld quality and less wrist strain at the end of the day. The heavy-duty metal-jacketed conductor tube (gooseneck) is built to take a beating, resisting bending and damage from accidental drops or spatter buildup.

This specific configuration is a beast for heavy wire applications. It comes out of the box ready to run 1/16-inch wire, making it the weapon of choice for structural welding and heavy equipment repair. The Tweco backend connection is the industry standard for a reason—it provides a solid, high-current path that doesn't overheat. If you are running a Lincoln, Miller, or ESAB feeder with a Tweco adapter, this gun will lock in and perform immediately.

Don't let downtime kill your productivity. The Classic No. 4 is designed to be completely serviceable. From the trigger switch to the cable liner, every part is replaceable. You won't need to throw this gun away if a component wears out; you simply fix it and get back to burning wire. It uses the standard Tweco consumables you likely already have in your toolbox, including the heavy-duty slip-on nozzles and coarse-thread contact tips that resist seizing.

Why Welders Choose the Classic No. 4

• Proven Durability: Built to survive drops, drags, and heat.
• Superior Reach: 25-foot cable allows for versatile positioning.
• High Amperage: 400A rating handles high-deposition welding with ease.
• Easy Maintenance: Simple design allows for quick liner and tip changes.
• Universal Fit: Tweco connection fits a vast range of industrial wire feeders.