These are open-coil helical springs that offer resistance to a compressive force applied axially. Common forms of compression springs include constant diameter, conical, tapered, concave, and convex. Round wire is predominant in compression springs because it is readily available and adaptable to standard coiler tooling; but square, rectangular, or special section wire may also be specified. There are four basic types of compression spring ends consisting of "open, closed, open & ground, and closed & ground." Design envelope dimensional limits together with the load and deflection requirements, determine the stress level of the spring. It is extremely important to carefully consider the space allotted to insure the proper function of the spring.
