The inner component of a ball or roller bearing which provides a contact surface for the rolling elements of an antifriction bearing.
1.2550 inches minimum and 1.2600 inches maximum overall width, 1.6245 inches minimum and 1.6250 inches maximum overall outside diameter, 1.3745 inches minimum and 1.3750 inches maximum bore diameter, sae assn std all material responses overall material document and classification, straight bore shape