Used 22mm Full Metal Planetary Gearbox with DC 12V 2Phase 4Wire Stepper and Electronic Starter Key features Condition: Used unit, functional condition; inspect fit and wiring before installation. Gearbox: Full metal planetary gearhead, 22 mm diameter for compact installation. Motor type: DC 12V, 2phase 4wire stepper configuration for precise step control. Starter: Builtin electronic starter to improve motor startup behavior under load. Performance: Precision gear reduction designed for increased torque and stable low speed rotation. Construction: Metal housing and gears for mechanical durability in repeated use. Compatibility: Works with standard 2phase 4wire stepper drivers and 12V DC power supplies. Confirm mechanical shaft fit prior to mounting. Why this unit is useful Higher torque in a small package: The planetary reduction multiplies motor torque while keeping the overall diameter to 22 mm, making it suitable where space is limited but extra force is required. Better control and stability: The 2phase 4wire stepper configuration provides accurate step positioning. The electronic starter helps the motor begin motion smoothly against initial resistance. Robust build for repetitive use: Full metal gears and housing improve wear resistance compared with plastic components, making the unit appropriate for repetitive actuation tasks. Typical applications Small robotics joints and grippers where compact, torque rotation and precise positioning are required. Precision positioning assemblies such as pan and tilt camera mounts, sensor actuators, or optical focusing mechanisms. Automated valves, small turntables, and industrial prototypes that require reduced speed with increased torque and reliable startup. Installation notes Requires a compatible 2phase 4wire stepper driver and a stable 12V DC supply. Verify mechanical shaft dimensions and mounting holes for correct fit before installation. As a used part, check for wear and confirm electrical continuity and mechanical smoothness prior to final assembly. This unit is suited to projects and repairs that need a compact, metal planetary gearbox paired with a 12V stepper motor for improved torque and precise control.