20402177 - Tweco 2040-2177 Conduit Nut for MIG Gun Liners

Keep Your Wire Feeding Smooth with the Tweco 2040-2177 Nut

Every welder knows the frustration of erratic wire feeding. You pull the trigger, and the wire stutters, burns back, or birdnests at the feeder. While it's easy to blame the liner or the contact tip, sometimes the culprit is the small hardware holding it all together. The Tweco 2040-2177 Conduit Nut is the unsung hero of your MIG gun's back end. It is the specific nut designed to lock your liner in place where the gun connects to the machine. If this nut goes missing during a liner change, or if the threads get stripped out from years of use, your liner can float back and forth, killing your arc stability.

This is a genuine Tweco replacement part, meaning it fits your Tweco gun exactly as intended. Don't try to jam a hardware store nut onto your welding gun; the thread pitch and depth on the 2040-2177 are specific to Tweco adapters. Using the wrong part can ruin the threads on your expensive power pin. This nut is built tough to handle the vibration and heat of the welding environment, ensuring that once you tighten it down, it stays tight.

Whether you are running a classic Tweco Spray Master or another compatible model, keeping a spare conduit nut in your toolbox is a smart move. It's one of those small parts that is easy to lose in a dark shop floor when you're swapping out a kinked liner. Having a fresh 2040-2177 on hand means you can get your gun back together and get back to burning wire without a trip to the supply store. It’s a small investment that protects the performance of your entire rig.

Installation is easy: simply slide your new liner into the gun, seat the O-rings or collet, and thread the 2040-2177 nut over the liner protruding from the back. Tighten it down snugly to ensure the liner is fully seated against the diffuser at the front end. A properly secured liner means less friction, smoother feeding, and better welds. Don't let a loose liner ruin your bead—secure it with the right hardware.