Heavy duty precision spherical bearing with the ball made of 52100 heat treated steel (RC 56 min) with hard chrome plate. Race is heat treated alloy steel and oil coated.B Dia: 0.3125 D Dia: 0.75 W Width: 0.437 T Width: 0.344 O Dia: 0.448 Ball Dia: 0.625 F Chamfer: 0.02 Mis. Angle: 11