The working stroke is the travel range over which the pin keeps reliable contact; compression is usually set to 60%–80% of the total stroke so the spring always keeps a preload.
The procedure is: calculate the gap tolerance stack of the two mating faces, then choose a total stroke such that the minimum gap still keeps at least 0.15–0.25 mm compression and the maximum gap does not bottom out; finally confirm by life and contact resistance testing. Too little compression gives unstable contact, too much accelerates spring fatigue and plating wear.
For a project-specific evaluation, please contact Mr. Wan at 133-2018-8513.
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