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Old 02-07-2009, 10:10 PM   #1
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Default metals and coatings for mash tuns?

I am working on a cooler-based mash tun and I am having trouble finding a certain part, and it leads me to a question.

I have been looking for a stainless steel 3/4" washer for the internal side of the bulkhead. All I have been able to find is a zinc coated washer. Is the zinc coating a problem? Any negative interaction chemically with the mash? If so, where can I find a washer like this that is stainless steel?


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Old 02-07-2009, 10:16 PM   #2
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zinc is a electrically active metal, they use it on boats to prevent corrosion on motor parts, so i wouldn't think that in your acidic wort would be a good place. i found my SS washer at the local farm supply store .(tsc)


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Old 02-07-2009, 10:49 PM   #3
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IIRC I found a SS 3/4" washer at Lowes... I still can't believe it myself...
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Old 02-07-2009, 11:00 PM   #4
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Yup, 3/4" stainless washers are in the specialty drawers at Lowes. The closest lowes is always out of stock on them, but a newer one a little further away has them all the time.
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Old 02-07-2009, 11:52 PM   #5
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Any marine supply or Chandlery will have stainless hareware and washers by the box full.
For inside a round MLT pre bend the washer to match the radius first before installing unless it's a square MLT with flat mounting surfaces. Many 3/4" washers are rather oversize in the ID, this is where a 5/8" almost fits then a quick bore on the lathe for a nice fit is required.
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Old 02-08-2009, 12:05 AM   #6
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The ACE hardeware store in my small town has stainless not only in washers but SAE, Metric including left hand thread nuts, bolts and screws. True-Value has 1/10 of ACE, don't care plus higher priced.
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Old 02-08-2009, 02:47 PM   #7
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If you mix zinc (galvanized) metals with copper in a mildly acidic liquid you will be creating a battery. Both metals will corrode quickly.
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Old 02-08-2009, 02:51 PM   #8
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Got mine at Fastenal
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Old 12-31-2013, 10:01 PM   #9
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OK, I've been looking through tons of old threads on this topic.

I had picked up some zinc washers for my new cooler/mash tun build at Home Depot. Realized that was a bad idea. Then I found some washers at the local ACO hardware store that were just labeled "steel SAE". I picked up a few, but now I'm wondering if they are actually what I need. Of course, there was nobody around the store that seemed like they would have a clue enough to give an answer that I'd be willing to trust.

So, what do you all think? Is a "steel SAE" washer for $.50 OK, or do I need to go to Lowes to get the stainless steel ones that are $2.50 for 2 of them.
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Old 01-01-2014, 02:16 AM   #10
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SAE definitely doesn't mean stainless, it's more about the dimensions. You need stainless.


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