Even with a washer, the head of a straight bolt won’t hold very well in concrete when you go trying to tighten it, it’ll most likely start spinning and possibly even damage the concrete.
J Bolts for concrete don’t have a head on them. The bent part is embedded into the concrete and would never be turned. Forming a hex head would be a wasted extra production cost.
That is one of those right angle bolts for getting into tight places. Hang onto it because they cost about $15 each new. It is specially made to transfer the torque from the head around the 90 degree bend. Just line it up with the nut, slap a driver on there and go to town. I promise, it will be amazing and nothing bad will happen.
These bolts are like this from the factory - I have 4 on my honey extractor, they are used for other situations where you need to bolt one thing perpendicular to each other.
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