Tweco GC-500 Heavy Duty Steel Ground Clamp with Copper Shunt

Reliable Grounding for Professional Welders

Every experienced welder knows that a bad ground is the root cause of 90% of welding problems. Sputtering arcs, wandering puddles, and hard starts can often be traced back to a poor connection at the work clamp. The Tweco GC-500 is built to eliminate these headaches. With a massive 500-amp capacity, this clamp is a workhorse for fabrication shops, structural steel erection, and heavy equipment repair. It doesn't just look tough; it acts tough.

The secret to the GC-500's performance is the combination of brute strength and electrical finesse. The jaws are made of steel, not soft copper, meaning they won't bend or lose their grip when you clamp them down on a rusty I-beam. The heavy-duty spring delivers a crushing grip that cuts through surface contaminants to establish a solid electrical contact. However, steel isn't the best conductor, which is why Tweco integrated a heavy-gauge copper shunt strap. This strap carries the welding current directly to the jaws, bypassing the spring and hinge. This means your clamp won't heat up in your hand, and the hinge won't seize up from arcing.

Designed for comfort and efficiency, the GC-500 is easy to install on your existing leads. The ball-point screw connection is simple to tighten and holds your cable securely, preventing it from pulling out during a long day of dragging leads around the shop. Whether you are burning heavy flux-cored wire or running high-amperage stick rods, this clamp ensures that the power from your machine actually makes it to your weld.

Why Choose the Tweco GC-500?

• Stays Cool: The copper shunt keeps the heat in the arc, not in the clamp.
• Lasts Longer: Steel body resists bending and breaking better than cast copper.
• Better Starts: High clamping force ensures immediate arc initiation.
• Versatile Fit: Opens wide enough for most common structural materials.