391:1 Metal Gearmotor 20Dx46L mm 12V CB SF_Spacers/Standoffs you should use the slot

you should use the slot that is one size larger)

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efficiency is improved and the component size also greatly reduced

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391:1 Metal Gearmotor 20Dx46L mm 12V CB SF_Spacers/Standoffs you should use the slotThese small brushed DC gearmotors can deliver a lot of power for their size. This version has a 12V brushed DC motor with long life carbon brushes combined with a 390. 6: 1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. Key specifications: voltage no load performance stall extrapolation 12V 36RPM, 80mA 21 kgcm (290 ozin),