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