039901 - Miller Dialarc 250 Male Cable Plug Connector Black #1-#4 AWG

Restore Your Dialarc's Performance

If you are running a classic Miller Dialarc 250, you know these machines are built like tanks and can last for decades. However, the connection points where your leads plug into the machine are often the first things to show wear. A loose or pitted plug doesn't just feel sloppy; it robs you of power, creates heat, and causes your arc to sputter. The Miller 039901 Insulated Male Jack Plug is the genuine replacement you need to get your leads locking in tight again. Designed specifically for the Dialarc series, this plug eliminates the guesswork of trying to jam a generic "universal" connector into your machine's specific receptacles.

Built for the Shop Environment
This plug handles welding cable sizes from #4 up to #1 AWG, covering the most common lead sizes used with 250-amp machines. The installation is straightforward—just strip your cable, insert it into the brass body, and tighten it down for a solid mechanical connection. The heavy-duty black rubber cover slides over the assembly to protect you from shocks and keep the connector shielded from sparks, dirt, and shop grease. The black color is perfect for marking your ground lead or keeping your AC/DC setups organized.

Why Stick with OEM?
Cheap aftermarket plugs often have poor tolerances. If a plug is slightly too small, it arcs inside the terminal; if it's too big, it won't seat fully. This Miller 039901 plug features the exact taper required for the Dialarc 250 and 250P, ensuring maximum surface contact. This means cooler running terminals, consistent amperage delivery to your stick electrode or TIG torch, and less wear on your machine's front panel. Don't let a $20 part compromise a $2,000 welder—refresh your connections with the part made for the job.