W7004020 - Lincoln Electric Polarity Board Knob for MIG 140/180 Series

Get Back to Welding with the Right Parts

There is nothing more frustrating than pausing a project because a small, essential part has gone missing or broken. If you own a Lincoln Electric MIG welder like the Easy MIG 140 or Weld-Pak 180HD, you know that switching between MIG welding with gas and flux-cored welding requires changing your polarity. The Lincoln Electric W7004020 Polarity Board Knob is the exact piece you need to secure those connections quickly and safely.

Over time, knobs can get stripped, lost during maintenance, or damaged in a busy shop environment. Using pliers or makeshift nuts to secure your polarity cables is unsafe and can lead to poor electrical connections, which results in an unstable arc and poor weld quality. This genuine Lincoln replacement knob is designed to be hand-tightened, giving you the grip you need to ensure a tight, conductive connection without reaching for the toolbox every time you swap processes.

Don't compromise on safety or convenience. This knob is built from durable, insulated material that protects your fingers and stands up to the heat and rigors of welding. Whether you are a hobbyist working in your garage or a pro relying on your portable MIG machine, keeping your equipment in top shape with OEM parts ensures your welder runs smoothly for years to come. Simply screw it on, check your cables, and you are ready to strike an arc.