What does a reference dimension mean on a drawing?

GD&T Training Definitions. Reference Dimension - A dimension, usually without tolerance that is used for information purposes only. It does not govern production or inspection operations. A reference dimension is a repeat of a dimension or is derived from other values on the drawing or related drawings. read more

A reference dimension is a dimension on an engineering drawing provided for information only. Reference dimensions are provided for a variety of reasons and are often an accumulation of other dimensions that are defined elsewhere (e.g. on the drawing or other related documentation). read more

A reference dimension is a dimension that is not crucial for the effective use of the part. Reference dimensions are not inspected. A reference dimension may also be a dimension that is shown elsewhere in the drawing but is shown in the current view to help clarify the position of other features in the view. read more