{HEAD ~ The nut} has a first end with {TAIL ~ the internal threads} and a second end with an inwardly directed shoulder 
{ HEAD ~ The nut } has a first end with { TAIL ~ the internal threads } and a second end with an inwardly directed shoulder
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH