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Body Length: length from coil to coil, not including ends (hooks or loops)
Deflection at Load: the distance a spring compresses or extends when a given load is applied
Free Length (FL): the overall length of a spring in the unloaded position
Initial Tension (IT): the number of pounds of force it will take to overcome the tension holding the spring coils together before the spring will start to extend
Inside Dimension (ID): specified when the spring must fit over a rod or mandrel with enough clearance to operate freely
Load: the force applied to a spring that causes a deflection (i.e., movement)
Max Deflection: the difference between the overall length and maximum extension, measured on one side of spring
Maximum Extended Length: the length of an extension at full rated extension
Outside Dimension (OD):specified when the spring must fit into a circular hole (Work in Hole Diameter) with enough clearance to operate freely or when there areother housing issues)
Pitch: the distance from center to center of the wire in adjacent active coils
Solid Height: height of a compression spring under sufficient load to bring all coils into contact with adjacent coils
Spring Rate (stiffness): the change in load per unit deflection
Stress Relieve: a process that subjects the springs to low-temperature heat treatment to relieve residual stresses
Wire Size (WD): the diameter of the actual spring wire