Features: It adopts precision machining, magnetic material treatment, and insulation treatment, features stable and reliable. This DC motor features large moment of force, and low noise, Stable performance The motor is made of metal gear, wear-resisting, avoid tooth breaking, so with long serving life. This DC motor supports clockwise and counterclockwise rotation. This motor is adopted of pure copper wire coil, with low heat and low loss. Specifications: Model: 31ZY Outer diameter: 31mm / 1.22in Shaft length: 19mm / 0.75in Shaft diameter: 3mm / 0.12in Type(Optional): 6V 4000rpm,12V 4000rpm,12V 8000rpm, 24V 3500rpm, 24V 5000rpm, 24V 8000rpm Weight:165g Wiring: CW: red: "+", black: "-" CWW: red: "-", black: "+" Working voltage V(Optional) 6V 12V 12V 24V 24V 24V No-load current mA 180 350 110 200 200 41 No-load speed rpm 4000 8000 4000 5000 8000 3500 Rated moment of force gf.cm 100 200 100 200 200 150 Rated speed rpm 3200 6500 3200 4000 6600 2500 Rated current A 0.8 1.6 0.5 0.6 1.0 0.3 Locked-rotor moment of force gf.cm 500 1000 600 850 1200 400 Locked-rotor current A 3.3 6.5 2.3 2.0 4.4 0.8 Package includes: 1 x Motor