The radially inner ends of the frustoconical surfaces are directed toward a first end of the fastener, and {HEAD ~ the diameter} of {TAIL ~ the radially inner end} of the frustoconical surface away from the first end of the fastener is less than the radially outer diameter of the other frustoconical surface 
The radially inner ends of the frustoconical surfaces are directed toward a first end of the fastener , and { HEAD ~ the diameter } of { TAIL ~ the radially inner end } of the frustoconical surface away from the first end of the fastener is less than the radially outer diameter of the other frustoconical surface
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 REL 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 OTH OTH OTH