The covered axes of the ELM series are particularly well suited for use in sensitive environments or in continuous operation. Here, too, the axis itself should be optimally protected against dirt. ELM axles have a polyurethane cover strap that does not run and offers protection from outside to inside and from inside to outside. The open interface to the carriage is kept very small and the cover durable and workable. This is made possible by a special construction of the cover. Premature length and porosity are avoided thanks to clever attachment.