Special Mounting: Motor pivots on rod for belt tensioning. Totally enclosed fan cooled motor produces extra high breakdown torques for maximum cutting power. Has 1 3/4" long shaft, 3/4" diameter with keyway. Added 54" cord to all motors 1 1/2-4 HP. Catalog numbers 120925 and 120997 replace Delta UNISAW® motor 83-621 (1 1/2 HP); 120728 and 120998 replace Delta UNISAW® motor 83-651 (3 HP).