Depending on the application, about 90% of the time, the most common bolting arrangement is to have one Solon Belleville Spring on each side of the joint. On the other hand, there are many applications where a single spring adds enough elasticity to the system. Conversely, there are other situations where three or more springs may be needed for a sound design. Your Solon application engineer can suggest how many Belleville springs should be used for a specific application.