Motor length 3.5" diameter / 6" long. 7.5" over all length Perfect Steerable Transfer Cartluding shaft 800W peak - Peak Amps is Watts divided by volts. W ÷ V = A 2mm shaft with 1.75 pitch threads with flat slot at shaft tip. THIS IS NOT A 3/4" SHAFT! Shaft is 1.5" long with 3/4" long. Get Price.