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Old 29-11-2007, 20:04   #1
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how to pick zinc anode

hello everyone
I am trying to find the right zinc anode for our 36 cc beneteau. it goes on our propeller. how do i know the size. I have looked at west marine but they don't carry the stlye we need. i found a site called boatzincs.com. they have the ones i need but have 5 different sizes. how can be sure which one to get
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Old 29-11-2007, 20:10   #2
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do you have a shaft or saildrive?
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Old 29-11-2007, 20:16   #3
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Is it a cone zinc that slips over a special nut designed to hold the zinc? Do you have a pic?
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Old 30-11-2007, 22:55   #4
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it is cone shaped. the nut actually goes threw the zinc and right into the center of the propeller. i can take a picture tomorrow and post
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Old 01-12-2007, 06:25   #5
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Beneteau has them, you have to tell them the size of the shaft (it's metric). I know the 393 and 423 have a 30mm shaft, don't know re 36 but I'm sure you do. Make sure you order a new screw too, I put them in underwater and worry about dropping the screws which I reuse. They're made by a Canadian (Canada Metals) company but very hard to find anywhere. Also the price has gone up double to what they were a few years ago. Have all zincs gone up?
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Old 01-12-2007, 07:02   #6
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Have all zincs gone up?
Only slightly. The cheap shaft zincs I use are only up maybe 6%. Since they make them by the boxcar load it's mostly the increase in the meatl price. Anything used in construction is up so zinc is a bit up. Bottom paint has however gone up a lot. Copper prices are not as soft as zinc.
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Old 01-12-2007, 07:11   #7
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Well Beneteau must be making a killing, I bought a few when I got the boat in 04, they were $10 a piece. Got some more last week, $20 a piece!! Not much you can do about it and it's still better than eating up a prop.
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Old 01-12-2007, 07:21   #8
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Fresh water or salt? Mag or zinc?
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Old 01-12-2007, 07:23   #9
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I use zinc in fresh and salt water. Never had a problem in the Great Lakes.
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Old 01-12-2007, 08:01   #10
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I use zinc in fresh and salt water. Never had a problem in the Great Lakes.
FYI, good read.

Cathodic Protection - Marine Cathodic Protection - MG Duff
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Old 01-12-2007, 18:58   #11
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Originally Posted by turkish6 View Post
hello everyone
I am trying to find the right zinc anode for our 36 cc beneteau. it goes on our propeller. how do i know the size. I have looked at west marine but they don't carry the stlye we need. i found a site called boatzincs.com. they have the ones i need but have 5 different sizes. how can be sure which one to get
Measure the diameter of your prop shaft. The shaft diameter will correspond with the size prop zinc you need. It is likely that you will need a 30mm zinc. West Marine carries them as does BoatZincs.com.
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Old 01-12-2007, 19:09   #12
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Measure the diameter of your prop shaft. The shaft diameter will correspond with the size prop zinc you need. It is likely that you will need a 30mm zinc. West Marine carries them as does BoatZincs.com.
They might on the west coast but you won't find then in a WM on the east coast. You used to see them once in a while at Boat US but most places don't stock the Beneteau prop zincs. Best bet is to order half a dozen from Beneteau. I tried to get them from Canada Metals, the manufacturer but no luck.
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Old 01-12-2007, 19:30   #13
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They might on the west coast but you won't find then in a WM on the east coast. You used to see them once in a while at Boat US but most places don't stock the Beneteau prop zincs. Best bet is to order half a dozen from Beneteau. I tried to get them from Canada Metals, the manufacturer but no luck.
These are not uncommon zincs. If you can't find them locally (hard to believe, considering how many Beneteaus there are around) West Marine sells them online, as do BoatZincs.com, where they go for less than 10 bucks for the 30mm size.
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Old 01-12-2007, 19:38   #14
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fst,

Don't want to belabour a point but would appreciate a link to WM site with 30mm Beneteau zincs. Went through their whole site, no luck. Would really like to get them for $10, B charges over 20.
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Old 01-12-2007, 19:41   #15
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Found them on Boatzincs. Under $10. Unfortunately just got 5 from Beneteau. Thanks, I'll know where to get them next time.
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