... order.)3.Mounting Model 1.Housing Mounting: A5(single shaft extension),AA5(double shaft extension) and frame No,(55-130). 2.Flange Mounting ... :A3(single shaft extension),AA3(double shaft extension) and frame No,( 55-130). 3.Foot Mounting ... : A1(single shaft extension),AA1(double shaft extension) and frame No,( 55-130).4.Usage 1 ...