The SquareFlange or Face has 4 - Non Threaded bolt holes at 1 5 7 and 11 O Cl...The Square Flange or Face has 4 - Non Threaded bolt holes at 1 5 7 and 11 O Clock to mate up with the seal plate. Motor Shaft is threaded on the end. No attached Base. 48Y frame motors ship with a rubber spacer for use when replacing a (thicker) 56Y...more