Ductile iron; 5.000 in. O/a lg; 2.000 in. From center of bore to end of block; two mtg holes 0.516 in. Dia; 3.500 in. C to c of mtg holes; 2.000 od of hub; 1.750 in. Through bore; 1.252 in. Min, 1.255 in. Max bore dia; 0.375 in. H of flange; 0.875 in. From end of hub to center of hole in hub