Compression springs can be made with different end types. Each one affects how the spring sits, how it carries load and how well it works in the final assembly. There are three common options.

Closed and Ground
This is the most widely used compression spring end. The ends are closed and then ground flat so the spring sits square and upright. This is important when accurate load at length is required, for example in valve applications. If the ends are not square and parallel, the spring will not compress evenly and the load may vary.

Closed and Unground
This type removes the grinding step, which reduces cost. The spring will not sit as squarely as a closed and ground spring, but for many uses this is not a problem. Closed and unground ends work well for bolt return springs, for small wire sizes below 0.5 mm and for large index springs where perfect squareness is less important.

Open Ends
Open ends are less common for compression springs. Because the last coil is left open, the spring naturally sits at the angle of the helix, so it leans rather than standing upright. This is usually not desirable but can be useful for specific applications such as augers, where the geometry supports the movement of material.

JB Springs manufactures custom compression springs for a wide range of industries and applications. Our team often works with designers and engineers to choose the most suitable end type and ensure the spring performs as required. If you would like support with your design, contact us to speak to a Springtellectual.

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