I concur with swall. The depression on the thread-side fracture face closely matches the bolt diameter, which was my first clue. The longitudinal trimming
marks on the side of the hex head don't inspire confidence either.
I also concur with comments about Harbor Freight. To call their tools Chinese junk gives Chinese junk a bad name. I once returned a small belt sander after seeing how appallingly unsafe it was. I didn't hang around long enough to insist on a full refund, but I won't be going back there soon.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"