KP4335-040S - Lincoln Electric .040 V-Groove Drive Roll Kit for Solid Wire

Smooth Feeding for Superior Welds

Every welder knows that a smooth, stable arc starts at the wire feeder. If your wire is slipping, stuttering, or birdnesting, your weld quality suffers, and your frustration levels rise. The Lincoln Electric KP4335-040S Drive Roll Kit is the solution for welders running .040 inch (1.0 mm) solid steel wire. These genuine Lincoln Electric replacement parts are designed to restore your machine's feeding performance to factory standards, ensuring that the wire is delivered to the puddle exactly when and how you need it.

Why V-Groove?
Using the correct drive roll for your wire type is Welding 101, but it is often overlooked. These rolls feature a V-Groove design, which is specifically engineered for hard, solid wires like mild steel and stainless steel. The "V" shape cradles the wire, providing a firm grip on two sides without crushing it. This is crucial because if you use the wrong roll—like a knurled roll meant for flux-cored wire—on solid wire, you will chew up the copper coating. That copper dust ends up clogging your liner and fusing your contact tip. The KP4335-040S prevents this, keeping your wire round and your liner clean.

Built for the Shop
Lincoln Electric builds these rolls from hardened steel to survive the daily grind of the fabrication shop. Whether you are welding structural steel, automotive parts, or general repairs, these rolls stand up to long shifts and heavy use. They are designed for easy installation, allowing you to swap them out quickly during maintenance or when changing wire sizes.

Troubleshooting Your Feed
If you are experiencing erratic feeding, check your drive rolls first. Worn grooves can lose traction, forcing you to crank down the tension knob, which only causes more problems. Replacing worn rolls with a fresh KP4335-040S kit allows you to back off the tension, extending the life of your gun liner and reducing the load on your feeder motor. Keep your arc smooth and your spatter low with the right drive rolls for the job.