856 UTC rust in endlinks
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Thread: 856 UTC rust in endlinks

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  1. #1
    Member torogoz's Avatar
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    856 UTC rust in endlinks



    Recently purchased my first Sinn, an 856 UTC with tegimented bracelet that I bought here and was originally purchased from Watchbuys in 2018. There are 2 years left on warranty and other than this issue the watch is pretty much perfect.

    While doing some strap changes I noticed what appears to be rust on the inside of both endlinks (the worse of the two is pictured above).

    Is this common? A warranty issue? Nothing to be concerned about?

    Any feedback would be appreciated. Thanks!


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  2. #2
    Member Salt_Water's Avatar
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    Re: 856 UTC rust in endlinks

    Steel is an interesting thing. As I understand it, a steel can be hard, tough, and or corrosion resistant.

    Hardness comes from a high carbon content. Unfortunately, this makes it brittle and vulnerable to rust.

    Corrosion resistance comes from, typically, chromium, which makes it soft.

    And toughness (the ability to flex and not break) comes from low carbon content and some other alloyed content.

    A while back, I bought a pocket knife with a blade made out of the S30V "super steel" which is supposed to score relatively high in all three categories. Sure enough, the blade is rusting. But not badly at all, just some spots. But it holds an excellent edge and is indeed very tough (I had to open a can with the knife point once upon a time).

    So from the picture, it looks to me like Sinn picked an alloy that is strong, hard, and abrasion resistant, but somewhat vulnerable to corrosion. I'd just clean it with some WD40 and not worry too much about it.

    I have a watch made of 316 stainless. That metal is softer than I would prefer. The watch won't really rust, but has been pretty badly scratched and scuffed over time, making it look a bit ratty.

    Now, with all that said, it truly could be a QC issue (non-spec steel that got through somehow), so I would be very interested in the answer you get were you to ask Sinn about this...
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  3. #3
    Member JacobC's Avatar
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    Re: 856 UTC rust in endlinks

    Ask Sinn, they'll likely want that back for QC analysis and send you a new one.
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  5. #4
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    Re: 856 UTC rust in endlinks

    Or, someone simply wore it around salt water and didn’t rinse it well. Sweat can be an issue too, and perhaps the previous owner was a profuse sweater? Anyway, I’d just do as above, clean it off and move on. If it reappears with normal use then maybe contact Sinn...
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    Too many flipped...

  6. #5
    Moderator Spring-Diver's Avatar
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    Re: 856 UTC rust in endlinks

    Quote Originally Posted by Geof3 View Post
    Anyway, I’d just do as above, clean it off and move on. If it reappears with normal use then maybe contact Sinn...
    This ^^^
    torogoz likes this.
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  7. #6
    Member sticky's Avatar
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    Re: 856 UTC rust in endlinks

    Try for a warranty claim. You may end up being told that it’s “normal” but you won’t know unless you try.
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  8. #7
    Member torogoz's Avatar
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    Re: 856 UTC rust in endlinks

    Thanks for all of the advice. I will clean it up for now and continue to monitor it. I’ll also reach out to Sinn. If anything interesting transpires, I’ll be sure to share.


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  9. #8
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    Re: 856 UTC rust in endlinks

    Good luck. Hopefully it will clean right off and not be a problem. But will be curious to see what happens.
    torogoz likes this.

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