Fixed ratio 22mm diameter epicyclic geared motor re944 mfa 944d621 epicyclic miniature metal gearbox brushed 621 gear ratio planetary gear 6 to 12v voltage rating 125w power rating 8000rpm no load speed 6650rpm maximum speed 200ma load current 18g cm maximum continuous torque 100g cm stall torque 22mm diameter 4mm shaft diameter 68mm long 65g weight high quality 3 pole motor with carbon brush gear metal construction acetyl first stage gears for noise reduction 4mm output