What tool do I need for this bolt that holds the crank arm on this stationary bike?

Question

I'm amateur and got this stationary bike. The crank arm, I think that's what it's called, fell off. I can put the bolt back (the one inside the red circle) and turn manually but can't tighten it. There was a cap on top of it. What tool do it need here?
It's completely round and not hex shape

abdnChap · Accepted Answer

That nut was put in the wrong way around.
This is what the nut looks like:

The hex end is what you should tighten with a approriate socket.
This is what it should look like when installed correctly:

If it ever get's super tight as it is now, to get it off, the easiest way is probably to cut it with a tremmel and chisel it out.
Good luck!

What tool do I need for this bolt that holds the crank arm on this stationary bike?

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