A couple of years ago I bought a pair of Urko 32″ HiPer bar clamps from Amazon. I gave them a quick test when they arrived, and promptly sent them back.
I understand that some clamps might be purposely angled slightly, such that at strong clamping pressures the jaws are put under tension and reach parallel alignment.
But these jaws, in my opinion, then and now, seem to be too off-parallel, at least for the not steel-hard materials I wanted to use them on. Maybe they’d be fine for clamping something to an I-beam.
In my quick test with scrap material, the clamps dug in, and I wasn’t able to achieve high enough clamping pressure to reach parallel alignment.
Their “application” image on Amazon showed 2 pieces of rectangular steel tubing stock being clamped together.
Since both clamps had similar jaw angles, I assumed that the clamps were simply far too heavy duty for what I wanted to use them for. Or maybe they were both defective.
It would take a LOT of force to correct those jaws into being parallel. Or maybe I was wrong about the clamps. I could never determine if the problem was with my expectations, or the clamps.
Would you consider these clamps to be too crooked, or perfectly designed?