What is the difference between Closed and Closed Ground ends (for Compression Springs)?
Compression springs can be coiled with many different configurations for the ends. If the space between the last two coils is reduced so that the end of the spring touches the previous coil the ends are said to be closed. If the end of the springs keeps the same pitch (space between the coils) the ends are said to be open. In either case the springs can be finished with a grinding procedure that causes the ends to be flat. When this is done on a closed end spring then the spring is now considered closed & ground. The most common type of compression spring for industrial use is closed and ground. Grinding the ends becomes more beneficial as the wire diameter increases, to ensure a flatter surface for the ends. • What is the free length of a spring? For a compression spring this is measured from one end of the spring to the other when no load is applied. For an extension spring this is measured from inside diameter of each hook before any load is applied. • What is solid height (for a co
