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As avandonk said, steppers don't really have an operational voltage. It depends on how you control them. My big box of steppers are all 1.8 deg/step and the listed voltages range from 3.6 to 9.4. All motors came from copiers that have supply rails of 5 & 24VDC.
The one on my desk is listed at 4.2V & 1.5amps, weighs in at 600g. These are fairly typical motors to salvage from copiers.
Mick - Xerox Technician
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