374551 - Tweco 3/4-Inch Keyed Flat Washer for Wire Feeders

Keep Your Wire Feeder Running Smoothly

Every welder knows that a smooth wire feed is the heartbeat of a good MIG process. If your drive rolls are slipping or your spool tension feels off, it might be time to check the internal hardware of your feeder. The Tweco 374551 3/4" Keyed Flat Washer is an essential replacement part for welders who maintain their own equipment. This isn't just a spacer; it is a keyed washer designed to slide onto the slotted shafts found in many professional wire feeders. The keyway ensures the washer rotates with the shaft—or stays locked in position relative to it—preventing the kind of free-spinning wear that can ruin expensive drive shafts over time.

During routine maintenance or when changing out drive rolls for different wire sizes, small parts like washers can easily be dropped, lost, or overlooked. However, reassembling your feeder without the proper keyed washer can lead to wobbly drive rolls and inconsistent wire feeding, which translates directly to frustration at the arc. This 3/4-inch flat washer provides the necessary spacing and bearing surface to keep your drive assembly tight and aligned. It acts as a secure buffer between the retaining mechanism and the moving parts of your feeder.

Don't compromise your machine's performance with makeshift hardware. This genuine Tweco part is built to handle the rigors of daily welding. Whether you are refurbishing an older feeder or simply replacing a lost part during a liner change, having the correct keyed washer ensures your machine goes back together exactly the way the factory intended. Keep your wire feeding consistent, your arc smooth, and your focus on the puddle, not on the feeder, by using the correct OEM parts for your Tweco equipment.