1、Most popular model equipped with 1.8 degree step angle 2、Specially designed and suitable for 3D Printers 3、Low noise and big torque and high quality 4、Bipolar 4-wire: Black A +, Green A-, Red B +, Blue B- 5、It has a quite stable performance during work and will not loss step Features: 1. Most popular model equipped with 1.8 degree step angle. 2. Specially designed and suitable for 3D Printers. 3. Low noise and high quality. 4. Bipolar 4-wire: Black A +, Green A-, Red B +, Blue B-. 5. It has a quite stable performance during work and will not loss step. Specifications: Compatible With: for 3D Printer Type: Hybrid Stepping Motor. Model Number: 42BYGH34 Rated Power: 5W Rated Torque: 0.3NM Number of Leads: 4 Wire Color: Black(A+), Green(A-), Red(B+), Blue(B-) Wire Length: Approx. 1m / 3.3ft Size: About 57 x 42 x 34mm / 2.2 x 1.7 x 1.3in Weight: About 247g Item Capability Step Angle 1.8° Maximum Temperature Rise 80℃ Environment Temperature -20℃~+50℃ Insulation Resistance 100 MΩMin. ,500VDC Electric Strength 500VAC for 1minute Maximum Radial Clearance 0.02 (450g-load) Maximum Axial Clearance 0.08 (450g-load) Maximum Radial Pressure 75N (20mm from the flange) Maximum Axial Pressure 15N Package List: 1 x 4-lead Stepper Motor for 3D Printer Warning: Make sure the motor connect to a constant current or chopper drive controller before you test motor. Connecting the motor directly to a power supply will destroy the motor.