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Crest-to-crest
Multiple turns stacked crest to crest, for a long deflection in a short space.
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With shim ends
Crest-to-crest with flat shim ends, so the load bears on a full circle.
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Single turn
One turn with a gap. A compact answer to light and medium loads.
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Nested
Turns nested inside one another for higher loads at the same free height.
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Wavo (round wire)
Round wire rather than flat, where a coil spring is being replaced.
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Overlap
Overlapping ends, for applications that need a continuous bearing surface.