Magnet Square - 0.125"

These are very small rare earth magnets - 0.125" cubed. Composed of Neodymium/Iron/Boron (NdFeB), these magnets are curiously strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches. Don't let the photo fool you - these are very small magnets.

Activates the reed switch (shown below) at a distance of about 1cm.

Sold in single units.


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  • Spike / about 2 years ago / 1

    I'm confused. These magnets do not look like they are 0.125" cubes. More like 0.25" cubes. Please could someone confirm?

  • Sembazuru / about 9 years ago / 1

    Don't forget to emblazon these with "do not swallow" stickers...

    I suppose you might be "safe" as long as you don't market them as toys. (I never did get a couple cubes of the buckyballs or cubes before they were recalled...) :'(

  • Member #103156 / about 13 years ago / 1

    Wait, so how big are these, really? Next to the quarter, they do indeed look to be about 0.125", but according to the ruler picture, it's over 0.25" to a side...

  • Crinos / about 13 years ago / 1

    Would this magnet paired with a Hall Effect Sensor or a Insulated Reed Switch be able to work mounted to the front wheel and fork on my MC?
    (I'm looking into building a wireless speedsensor).
    The distance from fork to wheel is some inches. (10 cm or so)

  • fluidic / about 14 years ago / 1

    I'm using these to trigger a Hall effect sensor. A bit more sensor sensitivity is nice on these since they pack less punch than a bulkier magnet, but they're still plenty strong if you have good sensitivity and a reasonable sensing distance.

    • Mark Fickett / about 13 years ago / 1

      Could you share numbers? It would be great to know what cm distance (even roughly) it takes for this magnet to trigger a Hall Effect sensor (itself rated to switch at 0.5-9.5mT or 5-95gauss).

      • Mark Fickett / about 13 years ago / 2

        I tested this magnet with a Hall effect sensor rated at 85G (see the test, this magnet at 1:20), and it switched at about 0.5cm.

  • Hareesun / about 15 years ago / 1

    Could i use these to trigger a Hall Effect Sensor?

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