HJ is the company who made them
8.8 is the METRIC grade ( not the same as USA grades ) of the bolt.
Real shear bolts generally only have enough thread for the nut to screw onto so the shear force is acting on the solid shank ( with or without a groove ) and not the threads.
They look like Std machine screws ( bolt threaded all the way to the head ) to me.
Dose the vendor have a real shop or is it nothing more than a web page that links to a few pallet spaces rented from Amazon.
Very hard to sue the latter if something goes wrong.
Dad had a saying that has proven to be perfectly true on countless occasions.
"He who buys cheap pas thrice"
And this is doubly true for anything sourced from the web.
