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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. Initial Tension (T)
The initial tension is the force required to slightly separate the coils. This dimension is approximate.
3. Length (L1)
Is the length to which the spring should be extended to measure the load P. It is a fixed value. L1 is also the maximum extension for static applications.
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. For stainless steel, the load should be multiplied by .833.
5. Outside Diameter (OD)
See Extension Springs Details for details.
6. Spring Rate (R)
The catalog lists the rate for each spring. As published, all rates have a tolerance of ± 10%. For stainless steel, the rate should be multiplied by .833.
7. 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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