Carbon brush dc motor Diameter 35.5mm,Length 50mm,Shaft 3.175mm ... load Speed 2000~25000r.p.m Output:5~75W DC motors models RS-540 or RS-545, Carbon brush ... dc motor, Cylinder, Diameter35.5 mm, length 50 mm; shaft ... voltage: 3.6~60V, At no load Speed 2,000~25,000 r.p.m, Output about 3~75W. fit ... .040.09,2500.128,0650.6420016.5664.71,561 DC Motor RS-540 & RS-545