SKA505 sapphire crystal swap. Sourcing a 30.9mm crystal, or will a 31mm fit?
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Thread: SKA505 sapphire crystal swap. Sourcing a 30.9mm crystal, or will a 31mm fit?

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  1. #1
    Member FerrisAus's Avatar
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    SKA505 sapphire crystal swap. Sourcing a 30.9mm crystal, or will a 31mm fit?

    Hi. I have a Seiko SKA505 Kinetic watch that I haven't worn for years due to a large scratch on the hardlex crystal. I removed the crystal last night, measured it, and was planning to order a sapphire replacement online. My issue is that the original hardlex crystal has a diameter of 30.9mm, which is an uncommon size for ordering a replacement. Plenty of online places sell sapphire replacements in 0.5mm size increments, but sourcing something that is 30.9mm is difficult. The only source I have found selling this size charge US$16 for delivery to Australia, which on top of the US$28 for the crystal makes the whole thing uneconomical (Aliexpress sells similar crystals in 0.5mm size increments for less than US$15 delivered to Australia). I have two questions: does anybody know somewhere I can economically source a 30.9mm sapphire crystal online? Or alternatively, would a 31mm crystal fit OK in my watch? I have no idea about tolerances for fitting watch glass, so am not sure how crucial a 0.1mm difference in size is. Any advice or recommendations is appreciated!
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  2. #2
    Member Alis66's Avatar
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    Re: SKA505 sapphire crystal swap. Sourcing a 30.9mm crystal, or will a 31mm fit?

    Depends how thick you need.
    https://www.esslinger.com/round-sapp...l-80-mm-thick/

    I don't think you could fit a 31 with the same gasket, probably would have to glue it in. Good luck!
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  3. #3
    Member FerrisAus's Avatar
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    Re: SKA505 sapphire crystal swap. Sourcing a 30.9mm crystal, or will a 31mm fit?

    Thanks for your reply Alis66, I appreciate it. I decided in the end that I just couldn't find the right size in sapphire crystal and went with a basic mineral glass replacement instead. A shame, but I guess it does the job.

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