Watch stem numbers-what do they mean?

Thread: Watch stem numbers-what do they mean?

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  1. #1
    Member flamingrabbit's Avatar
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    Watch stem numbers-what do they mean?

    Pardon for what I guess is a really easy question but this amateur couldn't find the answer. What do the numbers for watch stems mean? For instance a 401-906...I'm guessing it refers to the dimensions or function but I couldn't find any information on this. Specifically I need to know what the differences are between a 401-1370 stem and a 401-906 stem. I would like to replace an ETA 805.112 with the better ETA 955.122 movement and I have read that the 955 is a drop in replacement for the 805 and the only major difference I see is the 805 uses the 401-1370 stem and the 955 uses the 401-906 stem. The watch is a WR one with a screw down crown so I assume if there is a difference in length of the stems it will cause a problem. Oh, I should mention...both stems are a tap 10.

    Thanks for your help.

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    Moderator Samantha's Avatar
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    Re: Watch stem numbers-what do they mean?

    Hi flamingrabbit,
    The 401 signifies that the part is a stem. The second number such as the 906 is the stem number within that parts system. The numbers do not pertain to dimensions. Without seeing the specific dimensions for each stem, it would be difficult to tell what the differences are. Stems come with long threads and are sized to the particular watch, so the stem in one watch very likely will be a different length than it would be in another watch.
    Samantha

  3. #3
    Member flamingrabbit's Avatar
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    Re: Watch stem numbers-what do they mean?

    Samantha

    Thanks for replying. That's good to know. I was afraid that the stem on the new movement might be too short for this case and crown but it sounds like it is more likely to be too long. That should be fairly easy to deal with.

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