An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride
(PVC) hard, compact, and foamed pipes, includes an inner collar, an outer
collar, and a middle collar, each of the collars being radially joined by
webs to the particular adjoining collar. Each interior web and exterior
web, relative to the middle collar, can form a web pair, the webs of the
web pair being arranged to overlap at least partially in the radial
direction in a particular embodiment.