Chainplate fastenings

[Roly]

Don't you just feel sometimes you have a dragon by the tail?
I am preping my (re-stripplanked to above waterline) 34' sailboat to glass with
a 30oz triaxial.The frames and floors will be removed and it will be glassed inside as well and a reduced frame/floor configuration glassed into the hull structure. Don't ask me why I chose to do this, I just am! I am following
Tom MacN. scantlings.

On removing the chain bolts from their epoxy seats in the timber they turned out to be 3/8" what looked to be brass in SS 2 x 3/8 straps. I am inclined to replace with 1/2" 316 SS. Is this appropriate? There are three for
cap shroud,three for the aft lower and three for the frwd lower. Inside they are all connect by a 6"x2"x6' chain plank and three more bolts through frames.
I am removing the chainplank (because of the glass) and will have a laminated frame tabbed to the hull for each of the shrouds.

Any comments appreciated.

[marshmat]

I'm a bit leery of stainless steel in situations like this. A stainless bolt, put through a wood beam and embedded in epoxy, is in a highly anaerobic environment and will be quite prone to corrosion if any water gets trapped in there. Brass, due to its zinc content, is also rather poor in these conditions. What's corrosion resistant and has a high tensile strength.... perhaps someone with more wooden-boat experience will weigh in?

[lewisboats]

Originally Posted by marshmat

I'm a bit leery of stainless steel in situations like this. A stainless bolt, put through a wood beam and embedded in epoxy, is in a highly anaerobic environment and will be quite prone to corrosion if any water gets trapped in there. Brass, due to its zinc content, is also rather poor in these conditions. What's corrosion resistant and has a high tensile strength.... perhaps someone with more wooden-boat experience will weigh in?

Bronze or monel (cupronickle) Tho 316 is still pretty good. I would be more leary of 304 which should have lots of oxygen. Why not put a coat of epoxy on the bolt and some Pipe dope on the threads to seal any water out? Even if the wood is wet, the water won't get to the bolt with a good coat of epoxy on it.

Steve

[Roly]

The chain plates are stainless and 316 is the easiest option, so guess I will run with that.( Bearing in mind the risk of crevice corrosion) Thanks for the info.