A threaded fastener has a casing enclosing at least three radially inwardly biased arcuate segments positioned to engage {HEAD ~ the threads} of {TAIL ~ a bolt} or hollow threaded member 
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A threaded fastener has a casing enclosing at least three radially inwardly biased arcuate segments positioned to engage { HEAD ~ the threads } of { TAIL ~ a bolt } or hollow threaded member
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 OTH OTH OTH OTH