This is a medium size 12 Volt four-phase unipolar stepper motor (250 gram, 40 x 40 x 33 mm, without shaft). It has four coils of 90 Ohm DC each. The black wire is the common. One step is 1.8 degrees (200 steps per full turn).
This stepper looks a lot like the ones you can salvage from old 5.25 inch floppy drives.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.
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