CompressionSprings 1.When Used under a Static Load A static load is a load that hardly changes when the spring is in use, or about 1,000 times or less even if it is repeated. In this case, it is fine as long as the spring does not deform or the load does not decrease as a result, and so the permissible stress just needs to be within the elastic limit of the material. For compression springs that are subject to static loads, JIS B 2704 defines the permissible torsional stress criteria as shown in Figure 1. It is recommended that the normal stress be 80% or less. The stress correction factor … Continue reading Compression Springs: How To Calculate Spring Stress