Electrical Specifications: * Manufacturer Part Number: JK57HS56-2804 * Motor Type: Bipolar Stepper * Pitch Angle: 1.8 deg. * Holding torque: 1.26 Nm (178.5 oz.in) * Nominal current / phase: 2.8A * Phase resistance: 0.9ohms * Inductance: 2.5mH +/- 20% (1KHz) Physical specification: * Frame size: 57 x 57mm * Body length: 56mm * Shaft diameter: 6.35mm * Rod length: 20.6mm * Number of leads: 4 * Wire length: 300mm * Weight: 700g Connection: Black ( A +), Green (A-), Red (B +), Blue (B-)