Compression springs are open-wound helical springs that exert a load or force when compressed.
Compression springs of this nature are often referred to as cylindrical springs, conical springs, barrel shaped springs and concave springs.
The spring ends can be left plain or ground and affect the spring force.
Compression springs make up 80 to 90 percent of the springs manufactured.
For compression spring designs the following is required as stated in the spring drawing below.