Apprentice answerHow much threaded rod needs to engage inside a coupling nut
2nd YearHangers, Supports & AnchorsStop and get direction
A stripped rod coupling is a failed support joint. Remove the load, replace the hardware, and verify full/equal thread engagement by the approved detail.
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Plain-English answer
A coupling nut only works when both rods are properly engaged. If one rod barely catches, the connection can strip under load or vibration.
Support the line first, replace stripped parts, use the correct coupling, engage both rods fully/equally, lock it against rotation, and inspect nearby long-rod extensions for the same mistake.