Anode bolts

telsyork

telsyork

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10 Apr 2008
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Burton on trent
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Hi Guys
We have hull anodes mounted by thru hull bolts and nuts. These have corroded and need replacing.
My question is what type of bolt should I use, plated, stainless, brass. .?
We are in Portishead marina so salt water, zinc anodes.
Previous bolts were, I believe, plated mild steel.

Any metallurgists out there please help.
 
telsyork said:
Hi Guys
We have hull anodes mounted by thru hull bolts and nuts. These have corroded and need replacing.
My question is what type of bolt should I use, plated, stainless, brass. .?
We are in Portishead marina so salt water, zinc anodes.
Previous bolts were, I believe, plated mild steel.

Any metallurgists out there please help.
Click to expand...

Special studs , not just ordinary bolt and nuts

Galvanised / zinc plated or 316 stainless steel studs are available http://mgduff.co.uk/yachts-and-powerboats/products/ancillaries-for-anodes/anode-fixing-studs

Stainless ones look nice when out of the water otherwise zinc plated is good enough .

See also the fitting instructions http://mgduff.co.uk/support/fitting-instructions
 
Last edited:
longjohnsilver said:
Definitely not stainless! They will corrode away at a frightening rate. Don't ask me how I know this..................
Click to expand...

Sorry, memory playing tricks on me.

What I had were mild steel studs, which is what I've always had, but what caused them to virtually disappear in months were stainless nuts.
 
All Stainless on mine , only needed spanner to release tension, undo with fingers after that.
Hull/rudder and trim tab bolts all stainless.
 
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