: This is the reason I posted them I'm not sure wether they will be strong
: enough. They are made from hard maple. The cross-section of the padeye and
: hook is only 3/8 thick I think i'm going to enlarge this to at least 5/8.

Perhaps laminating thinner pieces with alternating grain would be worthwhile. Or you could just use high quality plywood for the hooks and padeyes.