RB-421 Servo (2-Pack)

Standard analog servo, 2.9–4.6 kg·cm stall torque at 4.8–6 V, 0.17–0.40 sec/60° operating speed. 3-wire connection (red +, brown –, yellow signal); 42 g, 40.2×20.2×43.2 mm. Pack of 2.

Start wiring

PWM · UART · Wide input · Wired

Servos

99 other options

9g micros and clutch PWM servos, IP67 metal servos to 35KG, and ST/SC/CF serial bus servos (2.3kg to 120kg.cm at 24V) — protocol matters as much as torque rating here.

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Related groups

4 groups

DC motors

N20 micros in 1:50–1:298 ratios, 6V TT gearbox motors (120:1, 160RPM), 12V quadrature encoder gearmotors up to 45kg.cm, plus coreless micros, vibration discs, USB fans and a few outlier brushless motors.

Motors & actuators · DC & gear motors · 135 parts

Motor drivers

H-bridge breakouts from 1A to 43A (DRV8871, TB6612FNG, BTS7960), stepper drivers (A4988, TMC260, TB6600), I2C servo/solenoid controllers, and Pi/Arduino shields — sized by current and protocol.

Motors & actuators · Motor drivers · 77 parts

Pumps & valves

Solenoid valves (DN15/DN20 12V), 6V pneumatic air valves, push-pull and lock-style solenoids, 5V electromagnets (3–35kg holding force), 6V electric push rods (10–100mm stroke), peristaltic dosing pumps and submersible water pumps.

Motors & actuators · Pumps & solenoids · 41 parts

Mechanics

Robot chassis (2WD miniQ, 4WD mecanum, 6WD outdoor), mecanum wheels (48–97mm), brass hex hubs (4–6mm), shaft couplers, 2GT timing pulleys and uArm robotic arms.

Motors & actuators · Robotics & mechanics · 144 parts