I was at a local store the other day that has used tools and ran across some C clamps. Not regular C clamps though. Massive ones. They’re don’t have the largest capacity that I’ve seen but they’re tops when it comes to girth. They were a good price and I had to bring them home. They were a little rusty but still moved fine. They’re Armstrong model number 78-080 and are listed as the “strongest C-Clamp produced.” I’m not sure if that is overall or just by them. They have a capacity of 2.25″-8.25″ and weigh in at 27.5 lbs a piece. According to the literature they have a proof test of 31,250 lbf which is something I’m sure I’ll need. Here’s a pic of them as purchased. The table they’re laying on is 30″x20″.
To clean them up, I hit them with the wire wheel. I figure there’s not much chance I can hurt them. They wire wheel is quick and leaves a finish ready for oiling.
I’m sure there are lots of reasons for me to own a couple 30 lb C clamps. Perhaps I’ll need to press something together that requires more force than my arbor press can deliver. Perhaps they’ll be useful on those big welding jobs I have. Just look how useful they could be.
On second thought, maybe I’ll just curl them during downtime in the garage.