Usually Coil Spring comes in Various Types, but the Three Common Types of Coil Springs are Compression Springs, Extension Springs and Torsion Springs. Space is defined as the operating envelope, the area in which Coil Springs will be used. In case of a Compression Spring, this may be the hole into which the spring fits, the rod over which it operates. Coil Springs are designed to satisfy Four Operating requirements i.e. Energy, Space, Environment and Service.