1040096 - Miller MDX-100 Replacement MIG Gun Neck Assembly

Get Your MDX-100 Back in Action

If you are running a Miller MDX-100 MIG gun, you know it's a workhorse for light fabrication and shop projects. But even the best gear takes a beating. Maybe you dropped the gun, or maybe years of heat and spatter have just taken their toll on the neck. If your neck is bent, stripped, or clogging up, it’s going to ruin your welds and your day. This Miller Neck Assembly is the exact fix you need to get back to laying smooth beads.

This is the genuine replacement part for the MDX-100. You might see the number 1040096 in your manual, but Miller has updated it to 1040097. Don't worry—it fits perfectly. It’s the same shape, same angle, and same Miller quality you expect. Swapping out a damaged neck is often cheaper and faster than buying a whole new gun, and it makes your welder feel brand new again. A fresh neck ensures your wire feeds smoothly without drag, and your gas flows evenly without leaks, which means less spatter and better penetration.

Why replace the neck? A worn neck can cause "micro-arcing" inside the tube, which leads to erratic wire feeding and burn-backs. If you've been fighting with your wire feeder and changed the liner and tip with no luck, the neck might be the culprit. This assembly is built tough to handle the heat and the shop floor environment. It connects solidly to your handle and accepts your standard MDX consumables.

Don't let a busted gooseneck slow down your production. Keep a spare on hand or replace that wobbly one today. This part is designed for the welder who needs their tools to work as hard as they do. Simply remove the old neck, install this new one, check your liner length, and you are ready to pull the trigger.