The threads of the segments substantially fully engage {HEAD ~ the threads} of {TAIL ~ the bolt} or hollow threaded member 
The threads of the segments substantially fully engage { HEAD ~ the threads } of { TAIL ~ the bolt } or hollow threaded member
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH