This size 42mm precision planetary gearbox lengthened has a gear ratio 3 to 100 and very low backalsh from 15arc-min to 20arc-min. It’s an excellent choice for applications that require good accuracy and stable reliability at an exceptional value. Wha’s more, this inline short planetary gearbox has a built-in input shaft coupling which can match any standard NEMA 17 stepper motor and brushless dc motor or other motors. Please note this extended gearbox are recommended for the motor has shaft length 15-25mm.
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