If it's that regular carriage bolt they call the "draw bolt" and it can be a regular hex bolt instead, many Gr 8 available. If it has to be a carriage, post the size and length. That is probably available at McMaster Carr and others (maybe not Gr 8 but SS). You can buy bolts in small quantities many places on the web. If you want help finding, need size and length. The only reason it would have to be a "stovebolt" is head clearance or the square under head is fitted into a square hole. All it does is pull the plates together and hold. Not an AD guy, but don't see why it can't be a hex bolt. Easier to find in Gr 8.
