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  • Stainless Steel Rusting?

     nafets47 updated 6 months, 3 weeks ago 2 Members · 4 Posts
  • nafets47

    February 25, 2021 at 8:57 pm

    So approx 1 year ago I replaced out some bolts on my Hobart Dishwasher to handle a leaking issue and I noticed recently that the bolts are starting to rust.

    I did use stainless steel bolts, so this seems odd since the whole value in using SS is to prevent this from happening.

    I am no chemist but perhaps the fact it is bolting the combustion chamber to the fill tank the heat + chemicals might have this effect…. any idea or recommendation on bolts to use so I don't have the most monstrous headache again with this machine? Would like to catch this and just terminatedly sort it so I don't have to repair something every year or so.

  • nafets47

    February 25, 2021 at 8:59 pm

    Damn. I just had a DUH moment.

    We have 0 hardness at the washer using salt for the water softener for the property. That in tandem with the chemicals and high heat will absolutely cause lower grade SS to rust.

    So my question is any recommendations on bolts that are made of high grade SS that will not rust?

  • fixbear

    February 26, 2021 at 8:19 am

    Do you know what stainless screws you used? Common ones are 17-7, 18-8, 18-8 mil spec, 316, and 316 super corrosive for high pressure. Each is slightly different and can have other problems like galling if improperly lubed for the application. Pretty much why it's best to use OEM. The mil spec ensures that the alloy is right for the spec. It's very hard to keep stainless alloys consistent and to the spec. The temp's involved, the different base metal melting points, different molecular weight, and making it all come together as it cools and crystalizes is very difficult. Accuracy can only be achieved in small batches. Ever wonder why those new stainless mixing bowls you bought from Pakistan or India get pit holes so quick. Especially if you put them in a dishwasher.

    The 18-8, 1/4 by 7/8 will cost about $5 for 50. 18-8 mil spec $7 for 10. And the 316 $5 for 25. You could also look at the Burmax 88 bolts. Non-magnetic, high strength, super corrosion resistance, heat tolerant, but the previous size mentioned are a little over a dollar each. So there would really need to be a reason.

  • nafets47

    February 27, 2021 at 2:41 pm

    Thanks. I will check that out.

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