997031 - ESAB ST-21 MIG Gun Guide Insulator (Pack of 2)

Keep Your ST-21 Torch in Top Shape

If you are running an ESAB ST-21 or ST-21M MIG gun, you know it's a workhorse of a torch, but even the toughest equipment needs maintenance. The ESAB 997031 Guide Insulator is that small but mighty part that keeps you welding without interruption. Located inside the torch head, this little insulator does exactly what its name says: it guides the wire and insulates the hot parts from the parts that shouldn't be hot. When this part wears out, cracks, or gets clogged with spatter, you start seeing problems like erratic arcs, internal arcing, or wire that just doesn't want to feed smooth.

We know that downtime is money lost, which is why this product comes in a convenient pack of two. Having a spare in your toolbox means that when you pop the nozzle off for a cleaning and notice the old insulator is toasted, you can swap it out in seconds and get back under the hood. You don't want to be stuck waiting on a shipping truck for a five-dollar part while a job sits unfinished. These are genuine ESAB parts, so you don't have to worry about filing them down or forcing them to fit—they are made specifically for your ST-21 setup.

Why replace it? Over time, the heat from the arc makes plastic and composite parts brittle. Once they crack, electricity can jump to places it shouldn't, potentially ruining your nozzle, your contact tip adapter, or even damaging the torch neck. A fresh guide insulator ensures your gas flows correctly and your electricity stays focused on the puddle, not the inside of your gun. It’s cheap insurance for your welding rig.

Whether you are in a heavy fabrication shop or a garage, keeping your consumables fresh is the key to consistent, high-quality welds. Don't let a worn-out guide insulator cause you headaches. Grab this 2-pack and keep your ST-21 performing like the day you bought it.