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This is a NEMA 17 bipolar four-wire stepper motor with a 99:1 planetary gearbox bolted on, sold with a mounting bracket and driver. The gearbox trades speed for torque and precision: the motor's 1.8-degree step becomes a tiny fraction of a degree at the output, so it turns very slowly and smoothly under load. That makes it a fit for positioning jobs that need holding force at low speed, not for anything that has to move quickly. Against a bare NEMA 17 it offers far more torque and finer resolution, but it is bulkier, heavier and slower, and the high ratio adds backlash and drag you can feel when turning the shaft by hand.
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This is a NEMA 17 bipolar, 4-wire stepper motor fitted with a planetary gearbox. The gearbox ratio is 99:1. It increases torque and improves step angle precision, which helps when the stepper has to rotate very slowly.
The motor has a 1.8 degree step angle. With the gearbox, the step angle is 0.018 degrees per step. It is built for high torque at low speed. The kit includes a driver and a mounting bracket, and the drawings and datasheets for the motor, driver and bracket are available as attached files.
