General Specifications: Step Angle Accuracy: ±5%(full step,no load) Temperature Rise: 80°CMax Ambient Temperature: -10°C +50°C Insulation Resistance: 100MΩmin.500VDC Dielectric Strength: 500VAC for one minute Shaft Radial Play: 0.06 Max.(450g-load) Shaft Axial Play: 0.08 max.(450g-load) Electrical Specifications: Model Number: 57HS13 Step Angle Degree(o): 1.8 Motor Length L inch (mm): 2.99(76) Holding Torque Oz-in (Nm): 254.88(1.8) --Parallel Number of Leads: 8 Phase Current (Amps): 4.0 Phase Resistance (Ohm): 0.5±10% Phase Inductance (mH): 2.1±20% Rotor Inertia Oz-in-sec2 (g.cm2): 0.006532(460) Detent Torque Oz-in (g.cm): 9.912(714) Weight Oz (kg): 35.27(1.0) Please visit leadshine's website for more information about this product.