Two options. Either 1/2 threaded rod with nuts on both ends or carriage bolts.
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Do you know right off the top of your head the length of the carriage bolts. I'm at Home Depot right now and I can pick up for carriage bolts but I don't know if they're 1/2 by 8 or 1/2 by 10 thanks. in addition with the carriage bolts are the holes in the hub square to fit the carriage bolts?