QWORK Beam Clamp, 20 Pcs 5/16" Zinc Plated Iron Safety Beam Clamp, 13/16" Jaw Opening

I purchased these to attach electrical wiring to an I-beam ... worked great.

Worked great as beam clamps. When purchased, it appeared as the bolts would screw into clamps. But, had to modify with nuts to clamp bolts in place onto beam clamp (one nut on top, one on bottom). Still, good value and sturdy to hold ufo lights on metal C channel/perlin.

Thankfully I’m only using these to clamp some sheet metal together but I’d be worried if you’re planning to hang things from beams like they are designed. Out of the first 10 I grabbed from the box, two of them the threads gave out before they were tight and one cracked. And before you say I probably over tightened them, I used a 14mm socket on a 1/4 ratchet. For something that’s rated to hold 250lbs that’s pretty bad.

I had to try these for the price, but I found out why they were so cheap. The ones I received were of mixed conditions. some looked old and dirty, some rusty and painted, some looked fairly new. We had about a 15% failure rate our of 6 boxes we ended up ordering in total. Some were cracked, some stripped, one or two were seized up and would not move. Over all, we ended up spending more time and money to use these, than just buying the good ones.

Needed these to clamp several pieces of metal together. Screws and welding were not an option.

They were easy-to-use and saved our greenhouse in the wind and snow

Product was as advertised, delivered timely and without defects.Decent product that did its intended job

Why call it 3/8" if there are no threads? Its just a hole that you slide your all thread rod through and you have to put a nut on the other side to keep it from sliding back out. Kind of lame. I ordered off amazon to get a few quick til my order of real beam clamps came in....i didnt know about this "minor" detail until they came in. They'll work though.