Further, {TAIL ~ the annular protrusion second end} can have a series of external threads on its outer surface for threaded engagement with a series of internal threads of {HEAD ~ a nut} 
Further , { TAIL ~ the annular protrusion second end } can have a series of external threads on its outer surface for threaded engagement with a series of internal threads of { HEAD ~ a nut }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD