Matl aluminum alloy per ams 4212 or ams 4280; 1.515 in. Long; body 2.8755 in. Min and 2.8760 in. Max od; hub 1.127 in. Od; bore 0.875 in. Min and 0.876 in. Max dia; counterbore from body end 2.625 in. Dia; 3 holes 0.125 in. Dia; 3 holes 0.3125-18nc-2, 0.375 in. Deep