A threaded hanger rod connects to a rod coupling secured with a jam nut. The placement of the jam nut is referenced from a permanent marker line marked on the threaded rod. The required clearance dimension measures one-half the coupling length plus the jam nut length plus one-eighth of an inch.
HANGER ROD PERMANENT MARKER LINE JAM NUT ROD COUPLING 1/2 COUPLING LENGTH + JAM NUT LENGTH + 1/8"
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