Lincoln ElectricK910-2 Heavy Duty Wide Ground Clamp - 500 Amp Rating - Copper Plated Jaw - Braided Copper Shunt

I needed to replace the stock clamp on my Millermatic 150. This was a huge improvement. The clamp is strong, but manageable with one hand. I also liked the quality compared with the cheap stock option. I may replace the ground clamp on my other welder with this also.

Used on my Miller welder after original clamp came apart

This item is the best I've used to date, it fits over 2 3/8" OD pipe, has a strong spring, both sides of the jaws are connected to the ground lug by an internal copper strap, has two ground cable holes to keep the cable in place, and feels nice and sturdy. The ground lug bolt is 1/2'' which can be be replaced with a 3/8'' or whatever size your ground lug eye is intended to use, so don't let that affect your decision.

I have tried quite a few clamps of this "stamped" style and this one is by far the best. Opens nice and wide, exceptional quality (for the price), and the grip area flattens out so welders with smaller hands can still grip it with one hand to open it. I use other ground attachment styles as well depending on the project but for my clamp appropriate work this is my go-to.

Grounds well, has a strong spring.