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Author Topic: keel bolt  (Read 2921 times)
liz873
Pick-up Crew
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Posts: 1
Boat Type: 20' sloop custom

« on: October 28, 2008, 08:47:09 am »

What would better serve as a keel pivot bolt- zinc plated steel, or galvanized. I can't seem to find a stainless steel one. I was told stainless will corrode if constantly submerged in salt water.  Any input woul be appreciated- thanks wes.
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sonosail
Administrator
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Posts: 1865


« Reply #1 on: October 29, 2008, 08:58:29 am »

I would think that stainless is the way to go (or maybe bronze?)but I'm not exactly an authority on this subject.  I think you should find some really knowledgable people when it comes to this kind of thing at http://www.plasticclassicforum.com or
http://www.boatdesign.net.  What size pin or bolt do you need?
Most marine stores carry up to 1/2",  but larger sizes are available though companies that specialize in this kind of thing.
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Gerard
Regular
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Posts: 13
Boat Type: Nicholson 43


« Reply #2 on: July 05, 2009, 11:21:49 am »

Zinc plated is probably the best way to go, galvanized has a thinner coating I think?
I hadn't thought of bronze.
RVS might not be so good. It needs oxygen to maintain that thin protective corrosion layer. In seawater there usually is enough oxygen, the chlorine is the bigger enemy here. BUT enclosed in the bottom of the ship the oxygen may be depleted soon giving free roam to chlorine and acids (polyester and silicon sealant!!). In 40 yrs time the stainless steel bolts, used to attached the genoa rail to the deck of my ship, have completely corroded away. The genoa rail itself is spotless.

BTW: Never use silicons sealants on board a ship!

Gerard
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Apart from circum navigare you will be sailing up wind about 70% of the time.
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