Steel+2.865 in. Od of flange; 2.735 in. Across flat; double hub; 1.690 in. Od by 0.240 in. Lg; other hub 1.500 in. Od by 0.175 in. Lg; w/roller bearing 1.000 in. Id; bearing is full lg of item; flange has one notch /16 in. W by 0.118 dp, located approximately 150 degrees from flat portion