The 28BYJ-48 is a small stepper motor suitable for a large range of applications. Features & Specs * Rated voltage: 5VDC * Number of Phase 4 * Speed Variation Ratio 1/64 * Stride Angle 5.625° /64 * Frequency 100Hz * DC resistance 50Ω±7%(25℃) * Idle In-traction Frequency > 600Hz * Idle Out-traction Frequency > 1000Hz * In-traction Torque >34.3mN.m(120Hz) * Self-positioning Torque >34.3mN.m * Friction torque 600-1200 gf.cm * Pull in torque 300 gf.cm * Insulation grade A