A compression spring is an open coil helical spring offering resistance when a load is applied against it. This load causes the coil to collapse at a specified rate of pounds per inch. Most compression springs are single diameter, special forms such as conical, concave (barrel), and convex (hourglass) are possible but may require additional set-up time. Round wire is the ideal choice and is available in various diameters and types. Round wire springs can be produced with standard tooling, thus reducing cost.
Tolerances on compression springs vary with each design. Defining your needs will help us provide the optimum spring for your application. Please refer to our Spring & Wire From Material List.
An extension spring is usually a closed coil helical spring containing energy to resist a pulling force. The pulling force causes the coils to separate at a given rate. Included in the rate is the variable-initial tension. Initial tension is the load necessary to overcome the internal forces which holds the coils tightly together. The amount of initial tension can be varied and should be determined prior to spring production.