A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 5998-00-500-8551
NSN 5965-01-320-1808
NSN 6620-00-534-5380
NSN 5945-00-917-0501
NSN 5855-00-925-0114
NSN 5855-01-325-3380
NSN 7035-00-215-3272
NSN 5855-01-585-7095
NSN 5935-01-302-2417
NSN 5935-01-095-7433
NSN 5960-00-921-5805
NSN 6150-01-003-1054