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Thread: Does anyone know the exact material of watch mainsprings?

  1. #1

    Does anyone know the exact material of watch mainsprings?

    I know the subject of magnetization of watches comes up a lot. I am curious as to what the field strength is to magnetize a watch but I am not sure on the the material of watch mainsprings. Obviously silicone ones are a non-magnetic so I am discounting them. Does anyone know?

    I have access to a full suite of magnetics simulation software that I use at work everyday to do this with.
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  2. #2
    I expect a lot will have a ingredient mix that is a trade secret.

    There's Nivarox to get you started though

    https://en.m.wikipedia.org/wiki/Nivarox

    There's Elinvar too, a nickel/steel alloy
    Last edited by Seriously; Sep 15, 2015 at 09:33 PM.

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  4. #3
    Porous Membrane skywatch's Avatar
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    Indeed, usually complex alloys. Nomos says their mainspring is Nivarox 1A, an alloy from iron, nickel, titanium, chrome and beryllium. I suspect a magnetic profile might be a bit tricky to model.
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    Another Member crownpuller's Avatar
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    Quote Originally Posted by 93EXCivic View Post
    I know the subject of magnetization of watches comes up a lot. I am curious as to what the field strength is to magnetize a watch but I am not sure on the the material of watch mainsprings. Obviously silicone ones are a non-magnetic so I am discounting them. Does anyone know?

    I have access to a full suite of magnetics simulation software that I use at work everyday to do this with.
    Sorry to be pedantic, but do you mean hair-spring not mainspring ?
    If not: The field strength to magentize a mainspring would surely be academic, as by the time it was even slightly affected, the hair-spring would be pretty much fully 'clamped' up
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    MWC is that my watch's Avatar
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    good question would have thought hairspring too as that is the one that regulates the time is it not ? but then I always get them two mixed up
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  7. #6
    Quote Originally Posted by crownpuller View Post
    Sorry to be pedantic, but do you mean hair-spring not mainspring ?
    If not: The field strength to magentize a mainspring would surely be academic, as by the time it was even slightly affected, the hair-spring would be pretty much fully 'clamped' up
    I just assumed he was talking hair

  8. #7
    Quote Originally Posted by crownpuller View Post
    Sorry to be pedantic, but do you mean hair-spring not mainspring ?
    If not: The field strength to magentize a mainspring would surely be academic, as by the time it was even slightly affected, the hair-spring would be pretty much fully 'clamped' up
    Yeah that


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  9. #8
    Adjusted in 6 positions tempocalypse's Avatar
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    Rolex uses a proprietary alloy called Parachrom for their hairsprings

    According to this (un-cited) TRF post,

    Elinvar - 59% Iron, 36% Nickel, 5% Chromium.

    Nivarox - 45% Cobalt, 20% Nickel, 20%Chromium, 5% Iron, rest is Titanium and beryllium

    Parachrom - 85% Niobium, 15% Zirconium. Oxygen is often mentioned as a "component" of the alloy in other sources but is likely referring to the oxidation of the surface during heat blueing the hairspring which Rolex found increased stability over time.

    http://www.rolexforums.com/showthread.php?t=130539

    More on Parachrom

    http://watchmakingblog.com/2008/05/0...om-hairspring/
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    The Dude Abides Nokie's Avatar
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    What about pixie dust and unicorn tears.....?
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  13. #10
    Quote Originally Posted by Nokie View Post
    What about pixie dust and unicorn tears.....?

    Sintered pixie dust was outlawed in the 70's.... and unicorn tears were replaced with unicorn ears

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