To initiate the design of compression springs, one must take into account all the physical constraints surrounding the spring. Considerations for compression spring dimensions include the outer diameter, inner diameter, free length, solid height, and the material employed.

Outer Diameter or Outside Diameter

The outer diameter of your compression spring should be contemplated, particularly if it is to be accommodated within a cavity. Moreover, if there are elements within the apparatus surrounding the spring, those should be gauged and factored in accordingly.

Inner Diameter or Inside Diameter

The inner diameter of your compression spring warrants attention, especially if the spring is positioned over a shaft or mandrel. There should be a clearance of ten-thousandths of an inch between the shaft and the spring to avert friction.

Free Length

It is advisable for the free length of your compression spring to exceed the provided space slightly, ensuring it is in a pre-loaded state and securely positioned.

Solid Height

The solid height of your spring is dependent on the wire diameter and the overall coil count. It is crucial to ascertain that the solid height does not surpass the loaded height in either elevation or length.

Material Type

Selecting the appropriate material is a pivotal consideration in compression spring design. The environmental conditions in which the spring will be deployed, encompassing factors like temperature and moisture, must be taken into account. Opting for excessively extravagant materials can escalate costs, so it is prudent to strike a balance. The material’s ability to withstand higher temperatures correlates with increased costs.