Spring Information
Helical (wound in a round shape) springs of round wire will need a description to define the Coil Diameter, Wire Size, Number of Coils, and a Type of End. The Coil Diameter could be specified as an Outside(O.D.) , or Inside Diameter(I.D.) or even the Mean Diameter(average of O.D. & I.D. used for calculations). The Wire Diameter and Number of Coils may be defined in another way than actually calling out the size and count. An example is by calling out a rate or known fixed load requirement. But if known it is best to at least list Wire Size and Coil count as a referance.

Extension Springs
Known Load: If you have a known load required at a known length, this is the best way to specify the spring. If you also specify the length inside of the Hooks (very common like the free length of a compression spring) then you have established a functional rate. Now we may use the coils that give you the load you need.  If you don't have specifications or a print to send then call or write (email / fax) us and we can walk through the specifications with you.