Force calibration safety starts before the first load is applied. A threaded connection in a 200 000 lbf (890 kN) tension setup let go with only three of thirty required turns engaged — 10 % of the specified 2.500 in depth. Partial engagement, not overload, caused the failure. This case study covers verified engagement, why tension releases without warning, the accuracy cost of a changed load path, and the four controls that prevent a recurrence.
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