Abstract: An expandable anchor stud in which a threaded bolt or threaded rod carries two axially spaced, oppositely tapered expansion plugs which, when axially advanced against each other, cause the segments of a split stud shell positioned between the expansion plugs to expand radially, the two or three separate segments of the shell being radially retained against each other by a spring collar received inside a peripheral groove. In a novel production method, the shell segments are obtained from strip stock.