Parameters: - Step Angle Accuracy: ±5%(full step, no load) - Resistance Accuracy: ±10% - Inductance Accuracy: ±20%- -Temperature Rise: 80 Degrees Celsius Max.(rated current,2 phase on) - Ambient Temperature: -20°C-+50°C - Insulation Resistance: 100MΩ Min.500V DC - Dielectric Strength: 500V AC for one minute Important Notes: The diameter of axle of this motor is 6.35mm(1/4" ) , we also have 8mm 57x76 motors. Package included: 1 x nema23 stepper motor (57x76)