Begin by finding the outside diameter (O.D.) and length or rate (strength) you require. You can reference the diagram shown on the right.
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Spring rate is the load (pounds) it takes to deflect (compress) the spring one theoretical inch, i.e., if the rate = 40 lbs./1 in., it would take 10 pounds to deflect it 1/4 inch, or 80 pounds for 2 inches, etc.
If the length or rate is not known, but the installed working length (WL) is, then select a spring say 30% longer than the WL. You must know the load at the WL. Just subtract the WL from the springs selected free length and multiply by its rate to obtain the load to compare with your required value.
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If the load required is not obtained, select a new candidate with either an increase or decrease in rate (strength) or free length.
Be certain that the tabulated solid length (completely compressed) for your candidate spring indicates enough room for deflection and also that the deflection is not significantly greater than the tabulated Maximum Suggested for stress reasons.
Note: If the spring needed for your application cannot be found in our inventory, we can fabricate it for you. Simply request a quote.
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