12101100 - Tweco 21-37 MIG Gun Nozzle, 3/8" Bore, Slip-On (2-Pack)

Get the Job Done with Tweco 21-37 Nozzles

If you are running a Tweco #1 or Mini-MIG gun, the 21-37 nozzle is likely your go-to front-end part for day-to-day welding. This pack of two gives you a fresh start for your torch, ensuring you aren't fighting against a clogged or battered nozzle while trying to lay down a smooth bead. The 3/8-inch opening is slightly smaller than the heavy-duty 1/2-inch versions, making it the perfect choice when you need to see the puddle clearly or get your gun into a tight corner on a car frame or bracket.

One of the best features of the 21 Series nozzles is the slip-on design. We've all struggled with threaded nozzles that get welded shut by spatter or seized up from heat. With the 21-37, you simply twist and pull to remove the old one, and push the new one right onto the insulator. It stays put during welding but comes off easily when it's time to clean out the spatter or change a contact tip. The solid copper construction handles the heat of a 180-amp gun without melting or deforming, provided you keep it relatively clean.

Spatter buildup is inevitable, but these copper nozzles clean up nicely. A quick dip in nozzle gel before you start welding will keep the spatter from sticking too hard. When the spatter does build up, the smooth bore makes it easy to ream out with a pair of MIG pliers. Don't let a beat-up nozzle ruin your gas coverage and cause porosity in your welds; keep a couple of these 21-37s in your toolbox so you are always ready to weld.