K346A - Lincoln Electric NA-5S Wire Drive Head Assembly (142:1 Ratio)

Reliable Feeding for Your Sub-Arc Setup

If you are running a sub-arc beam line or welding heavy wall pipe, you know that the wire feeder is the heart of the operation. The Lincoln Electric K346A Wire Drive is built specifically for the legendary NA-5S system, giving you the muscle you need to push thick wire all day long. With a 142:1 gear ratio, this drive head doesn't struggle. It is designed to grab onto wires as thick as 7/32 inch (5.5mm) and feed them with absolute consistency. No more stuttering starts or inconsistent burn-offs—just smooth, reliable delivery that lets you focus on the weld puddle and the travel speed.

One of the biggest frustrations in automatic welding is wire cast causing the arc to wander off the seam. The K346A solves this with a heavy-duty wire straightener included right in the assembly. This straightener takes the curve out of the wire before it hits the contact tip, ensuring the arc hits exactly where you aimed it. This extends the life of your contact tips and reduces the need for constant adjustments during long runs. It’s a simple feature that makes a massive difference in daily operation.

The package is ready to work right out of the box. It includes the flux hopper, which mounts directly to the assembly, keeping your flux delivery right next to the arc where it belongs. You also get the necessary 4-foot cords for the motor and the hopper, making connections to your NA-5 control box quick and easy. The construction is classic Lincoln Electric tough—metal housings, heavy gears, and industrial-grade connectors that can take the heat and abuse of a real shop environment.

Whether you are welding bridge girders, pressure vessels, or ship panels, the K346A gives you the control and reliability you need. It turns your NA-5S setup into a workhorse that can handle the heaviest wires and the longest shifts. Don't let a weak feeder ruin your deposition rates; upgrade to the K346A and keep the arc burning smooth.