"DerbyDad03" wrote in message
Thanks, but unless I'm looking at the wrong type of plow bolt, they
are not the same.

Compare the heads of the bolts in this picture. I need the flat head
to be flush with the surface when drawn tight. It looks like the plow
bolt would produce a result similiar to a carriage bolt - a bump if
the head is not drawn flush and an indentation around the head if it
is.

Can you not just file or grind down the head of a carriage bolt so it's
close to what you're looking for? You could do the essentially the same to a
regular headed bolt too. If you need the thick neck that carriage bolts have
to hold it place, then you could use a fully threaded bolt and just add a
nut screwed on all the way.