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 5965-01-348-0079
NSN 5985-01-048-6826
NSN 5855-00-058-1293
NSN 6650-00-238-1199
NSN 5930-01-078-3700
NSN 6150-01-330-9055
NSN 6145-01-457-9743
NSN 5998-01-413-4221
NSN 5895-00-286-3788
NSN 5910-01-506-1913
NSN 5975-00-383-7679
NSN 5999-01-386-6979