42mm Series 2 Phase Close-loop Stepper Motor  Step accuracy: 5% Temperature: 80℃Max Ambient temperature: -20℃-+50℃ Insulation resistance: 100MR Min 500VDC Pressure resistance: 500VAC 1 minute Radial runout: Maximum 0.02mm (450g load) Axial runout: Maximum 0.08mm (450g load) Specification Model Step Angle (°） Motor Lenth (L) Holding Torque (N.m) Rated Current (A) Resistance (Ω） Inductance (mH) Rotor Inertia (g.cm²） Weight (kg) YK242EC51E1 1.8 79 0.5 1.85 1.0 1.9 77 0.53 YK242EC67E1 1.8 95 0.77 2.3 1.45 2.8 115 0.6 Suitable drive model: SSD2205M Dimensions Dimensions Model Shaft Diameter D (mm) Shaft Type (mm) Shaft Length L1 (mm)      YK242EC51E1 8 Flat 0.5*15 21 YK242EC67E1 8 Flat 0.5*15 21 Encoder Wiring Black GND Red +5V Blue/White EA- Blue EA+ Orange/White EB- Orange EB+ *Motor / Encoder cable: 0.3m Motor standard cable: 1.5m (optional 2m/3m) Encoder standard cable: 1.5m (optional 2m/3m) Motor connection