The inner component of a ball or roller bearing which provides a contact surface for the rolling elements of an antifriction bearing.
1.8300 inches minimum and 1.8303 inches maximum overall outside diameter, inner ring, roller, cylindrical style designator, 1.2812 inches minimum and 1.2816 inches maximum overall width, 1.3750 inches minimum and 1.3755 inches maximum bore diameter, straight bore shape