Originally Posted by boatpoker
Another thread suggests you have a Beneteau 351. I've only surveyed three of that model and all three had cast iron keels with bolts, not studs and nuts.
Likely scenario is that the original steel
bolts and washers have been replaced with threaded rod and nuts. Hopefully metric... (with reference to your previous post re: self styled workers and getting worse in a hurry......)
Possible that the factory in SC had bolt availability issues, and used metric threaded rod and nuts and this is "original" but I genuinely doubt it (I also have never seen a Beneteau iron keel with anything other than steel
Check keelbolt material with a magnet, if SS definitely not original for an iron keel...
There is a Beneteau document available out on the interweb that provides guidance and torque specs for keel bolt replacement, along with "beneteau" part numbers
Suggest looking to an industrial supply house (mcmaster-carr) for some better options than "beneteau" parts