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Stepper Motor Standards
NEMA Standard Imperial Size Metric Size Metric Name
NEMA 11 1.1 inch 28 mm 28 Motor
NEMA 14 1.4 inch 35 mm 35 Motor
NEMA 17 1.7 inch 42 mm 42 Motor
NEMA 23 2.3 inch 57 mm 57 Motor
NEMA 34 3.4 inch 86 mm 86 Motor