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1. Free Length (L)
The free length is an approximate dimension. It should be understood that all springs have a built-in free length tolerance resulting from the O.D., wire, load and rate being toleranced.
2. Inside Diameter (ID)
For springs manufactured to O.D., the I.D. can be computed by subtracting 2 wire diameters ("d") from the O.D. It should be understood that this will provide an approximate value. For applications requiring the spring to fit over a shaft, 2.5 wire diameter
3. Length (L1)
Is the length to which the spring should be compressed to measure the load P. It is a fixed value. L1 is also the maximum compressed height before set.
4. Load P (P)
The catalog lists the load for each spring. As published, all loads have a tolerance of ±10%. The load should be measured by deflecting the spring to the length L1 specified.
5. Outside Diameter (OD)
See Compression Springs Details for details.
6. Solid Height (Sh)
The catalog lists the approximate solid height for each spring. It is important to note that this dimension is always approximate because it is based upon theoretical coil numbers. We do not recommend that springs be operated near solid height due to inaccuracies.
7. Spring Rate (R)
The catalog lists the rate for each spring. As published, all rates have a tolerance of ± 10%. The rate should be checked at load heights corresponding to 25% of P at L1.
8. Wire Diameter (d)
Normally, wire diameter is as specified in the catalog. Tolerances are as per the material specifications to which it is purchased. . Distortion during coiling changes the wire diameter slightly, and indicated diameter is always prior to forming. It is suggested that tolerances for drawings be ± .001" of the published value.
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